fix: keep DLO hooks outside regional compilation

Signed-off-by: Hongsheng Liu <liuhongsheng4@huawei.com>
2026-08-12 08:53:05 +08:00
359 changed files with 3770 additions and 27734 deletions
@@ -1,103 +1,153 @@
 #!/bin/bash
+# vllm-omni customized version
+# Based on: vllm/.buildkite/scripts/hardware_ci/run-amd-test.sh
+# Last synced: 2025-12-15
+# Modifications: docker image name for vllm-omni

-# Run vLLM-Omni ROCm tests directly in the MI300 Kubernetes pod. The pod's
-# container image is selected by test-template-amd-omni.j2; MI300 has no DinD.
-set -euo pipefail
+# This script runs test inside the corresponding ROCm docker container.
+set -o pipefail

-: "${PYTHONFAULTHANDLER:=1}"
-: "${HF_HOME:=/home/buildkite-agent/huggingface}"
-: "${HF_HUB_DOWNLOAD_TIMEOUT:=300}"
-: "${HF_HUB_ETAG_TIMEOUT:=60}"
-: "${MIOPEN_DEBUG_CONV_DIRECT:=0}"
-: "${MIOPEN_DEBUG_CONV_GEMM:=0}"
-: "${VLLM_ROCM_USE_AITER:=0}"
-export PYTHONFAULTHANDLER HF_HOME HF_HUB_DOWNLOAD_TIMEOUT HF_HUB_ETAG_TIMEOUT
-export MIOPEN_DEBUG_CONV_DIRECT MIOPEN_DEBUG_CONV_GEMM VLLM_ROCM_USE_AITER
-export PYTORCH_ROCM_ARCH=""
-export PYTHONPATH="${PYTHONPATH:-..}"
-
-if [[ "${VLLM_CI_DOCKER_DISABLED:-0}" != "1" ]]; then
-    echo "Error: MI300 CI must run natively with Docker disabled." >&2
-    exit 1
-fi
-
-if [[ -n "${TEST_COMMANDS:-}" ]]; then
-    commands="${TEST_COMMANDS}"
-else
-    commands="$*"
-fi
-if [[ -z "${commands}" ]]; then
-    echo "Error: No test commands provided." >&2
-    exit 1
-fi
-
-echo "--- Native in-pod ROCm CI"
-
-job_id="${BUILDKITE_JOB_ID:-${BUILDKITE_PARALLEL_JOB:-local}}"
-job_id="${job_id//[^A-Za-z0-9_.-]/_}"
-native_cache_root="/tmp/vllm-omni-native-${job_id}"
-TMPDIR="${native_cache_root}/tmp"
-TORCHINDUCTOR_CACHE_DIR="${native_cache_root}/torchinductor"
-TRITON_CACHE_DIR="${native_cache_root}/triton"
-VLLM_CACHE_ROOT="${native_cache_root}/vllm"
-XDG_CACHE_HOME="${native_cache_root}/xdg"
-HF_DATASETS_CACHE="${native_cache_root}/huggingface/datasets"
-export TMPDIR TORCHINDUCTOR_CACHE_DIR TRITON_CACHE_DIR VLLM_CACHE_ROOT
-export XDG_CACHE_HOME HF_DATASETS_CACHE
-mkdir -p "${TMPDIR}" "${TORCHINDUCTOR_CACHE_DIR}" "${TRITON_CACHE_DIR}" \
-    "${VLLM_CACHE_ROOT}" "${XDG_CACHE_HOME}" "${HF_HOME}" \
-    "${HF_DATASETS_CACHE}"
-
-if [[ "${VLLM_CI_REQUIRE_PERSISTENT_HF_CACHE:-0}" == "1" ]]; then
-    if ! command -v findmnt >/dev/null 2>&1; then
-        echo "Error: findmnt is required to verify the Hugging Face cache mount." >&2
-        exit 1
-    fi
-    hf_mount=$(findmnt -n -T "${HF_HOME}" -o TARGET 2>/dev/null || true)
-    if [[ -z "${hf_mount}" || "${hf_mount}" == "/" ]]; then
-        echo "Error: MI300 CI requires a persistent volume at or above ${HF_HOME}." >&2
-        exit 1
-    fi
-fi
+# Export Python path
+export PYTHONPATH=".."

+# Print ROCm version
+echo "--- ROCm info"
 rocminfo

-expected_gpus="${VLLM_CI_EXPECTED_GPU_COUNT:-1}"
-python3 - <<'PY'
-import os
+# cleanup older docker images
+cleanup_docker() {
+  # Get Docker's root directory
+  docker_root=$(docker info -f '{{.DockerRootDir}}')
+  if [ -z "$docker_root" ]; then
+    echo "Failed to determine Docker root directory."
+    exit 1
+  fi
+  echo "Docker root directory: $docker_root"
+  # Check disk usage of the filesystem where Docker's root directory is located
+  disk_usage=$(df "$docker_root" | tail -1 | awk '{print $5}' | sed 's/%//')
+  # Define the threshold
+  threshold=70
+  if [ "$disk_usage" -gt "$threshold" ]; then
+    echo "Disk usage is above $threshold%. Cleaning up Docker images and volumes..."
+    # Remove dangling images (those that are not tagged and not used by any container)
+    docker image prune -f
+    # Remove unused volumes / force the system prune for old images as well.
+    docker volume prune -f && docker system prune --force --filter "until=72h" --all
+    echo "Docker images and volumes cleanup completed."
+  else
+    echo "Disk usage is below $threshold%. No cleanup needed."
+  fi
+}

-import torch
+# Call the cleanup docker function
+cleanup_docker

-expected = int(os.environ.get("VLLM_CI_EXPECTED_GPU_COUNT", "1"))
-assert torch.version.hip, "PyTorch is not a ROCm build"
-assert torch.cuda.is_available(), "ROCm GPU is not available to PyTorch"
-actual = torch.cuda.device_count()
-assert actual == expected, f"Expected {expected} ROCm GPU(s), found {actual}"
-PY
+echo "--- Pulling container"
+## Temporary change to use AMD Docker Hub to store the vllm-omni image
+# to bypass the rate limit issue with ECR Public Gallery.
+# Images are now stored in a separate repository for vllm-omni, instead of vllm-ci.
+# TODO: @tjtanaa point back to ECR Public Gallery
+# once the amd agents are configured to use ECR Public Gallery.
+# image_name="public.ecr.aws/q9t5s3a7/vllm-ci-test-repo:${BUILDKITE_COMMIT}-rocm-omni"
+image_name="rocm/vllm-omni:${BUILDKITE_COMMIT}"
+container_name="rocm_${BUILDKITE_COMMIT}_$(tr -dc A-Za-z0-9 < /dev/urandom | head -c 10; echo)"

-echo "Commands:${commands}"
-if /bin/bash -o pipefail -c '
-set -E
-test_status=0
-trap '\''
-    command_status=$?
-    # Keep running subsequent commands, but retain a failure for the final exit.
-    # Prefer a test failure over pytest "no tests collected" when both occur.
-    if (( test_status == 0 || (test_status == 5 && command_status != 5) )); then
-        test_status=${command_status}
-    fi
-'\'' ERR
-eval "$1"
-exit "${test_status}"
-' _ "${commands}"; then
-    exit 0
+# TODO: @tjtanaa uncomment this once the amd agents are configured to use ECR Public Gallery.
+# # Install AWS CLI to authenticate to ECR Public Gallery to get higher rate limit for pulling images
+# sudo apt-get update && sudo apt-get install -y awscli
+##  Use safe docker login helper to prevent race conditions
+# source "$(dirname "${BASH_SOURCE[0]}")/../../common/scripts/docker_login_ecr_public.sh"
+# safe_docker_login_ecr_public
+
+## Pull the container from AMD Docker Hub
+
+docker pull "${image_name}"
+
+remove_docker_container() {
+   docker ps -aq --filter "name=${container_name}" | xargs -r docker rm -f || true
+   docker image rm -f "${image_name}" || true
+}
+trap remove_docker_container EXIT
+
+echo "--- Running container"
+
+HF_CACHE="$(realpath ~)/huggingface"
+mkdir -p "${HF_CACHE}"
+HF_MOUNT="/root/.cache/huggingface"
+
+if [[ -n "${TEST_COMMAND:-}" ]]; then
+    commands="$TEST_COMMAND"
 else
-    exit_code=$?
+    commands="$@"
+fi
+echo "Commands:$commands"
+
+PARALLEL_JOB_COUNT=8
+MYPYTHONPATH=".."
+
+# Test that we're launching on the machine that has
+# proper access to GPUs
+render_gid=$(getent group render | cut -d: -f3)
+if [[ -z "$render_gid" ]]; then
+  echo "Error: 'render' group not found. This is required for GPU access." >&2
+  exit 1
 fi

-if [[ ${exit_code} -eq 5 && "${VLLM_CI_ALLOW_NO_TESTS:-0}" == "1" ]]; then
-    echo "Pytest collected no tests; VLLM_CI_ALLOW_NO_TESTS=1, treating exit code 5 as success."
-    exit 0
+# check if the command contains shard flag, we will run all shards in parallel because the host have 8 GPUs.
+# TODO: @tjtanaa reenable to run VLLM_ROCM_USE_AITER=1 when AITER is shipped with prebuilt kernels.
+if [[ $commands == *"--shard-id="* ]]; then
+  # assign job count as the number of shards used
+  commands=$(echo "$commands" | sed -E "s/--num-shards[[:blank:]]*=[[:blank:]]*[0-9]*/--num-shards=${PARALLEL_JOB_COUNT} /g" | sed 's/ \\ / /g')
+  for GPU in $(seq 0 $(($PARALLEL_JOB_COUNT-1))); do
+    # assign shard-id for each shard
+    commands_gpu=$(echo "$commands" | sed -E "s/--shard-id[[:blank:]]*=[[:blank:]]*[0-9]*/--shard-id=${GPU} /g" | sed 's/ \\ / /g')
+    echo "Shard ${GPU} commands:$commands_gpu"
+    echo "Render devices: $BUILDKITE_AGENT_META_DATA_RENDER_DEVICES"
+    docker run \
+        --device /dev/kfd $BUILDKITE_AGENT_META_DATA_RENDER_DEVICES \
+        --network=host \
+        --shm-size=16gb \
+        --group-add "$render_gid" \
+        -e MIOPEN_DEBUG_CONV_DIRECT=0 \
+        -e MIOPEN_DEBUG_CONV_GEMM=0 \
+        -e VLLM_ROCM_USE_AITER=0 \
+        -e HIP_VISIBLE_DEVICES="${GPU}" \
+        -e HF_TOKEN \
+        -v "${HF_CACHE}:${HF_MOUNT}" \
+        -e "HF_HOME=${HF_MOUNT}" \
+        -e "PYTHONPATH=${MYPYTHONPATH}" \
+        --name "${container_name}_${GPU}" \
+        "${image_name}" \
+        /bin/bash -c "${commands_gpu}" \
+        |& while read -r line; do echo ">>Shard $GPU: $line"; done &
+    PIDS+=($!)
+  done
+  #wait for all processes to finish and collect exit codes
+  for pid in "${PIDS[@]}"; do
+    wait "${pid}"
+    STATUS+=($?)
+  done
+  for st in "${STATUS[@]}"; do
+    if [[ ${st} -ne 0 ]]; then
+      echo "One of the processes failed with $st"
+      exit "${st}"
+    fi
+  done
+else
+  echo "Render devices: $BUILDKITE_AGENT_META_DATA_RENDER_DEVICES"
+  docker run \
+          --device /dev/kfd $BUILDKITE_AGENT_META_DATA_RENDER_DEVICES \
+          --network=host \
+          --shm-size=16gb \
+          --group-add "$render_gid" \
+          -e MIOPEN_DEBUG_CONV_DIRECT=0 \
+          -e MIOPEN_DEBUG_CONV_GEMM=0 \
+          -e VLLM_ROCM_USE_AITER=0 \
+          -e HF_TOKEN \
+          -v "${HF_CACHE}:${HF_MOUNT}" \
+          -e "HF_HOME=${HF_MOUNT}" \
+          -e "PYTHONPATH=${MYPYTHONPATH}" \
+          --name "${container_name}" \
+          "${image_name}" \
+          /bin/bash -c "${commands}"
 fi
-
-exit "${exit_code}"
@@ -7,64 +7,54 @@ steps:

 - group: ":card_index_dividers: Simple Test"
  steps:
-    - label: "Simple · Model Executor Test · Shard %N/%t"
-      agent_pool: mi300_1
-      parallelism: 2
+    - label: "Simple · Diffusion & Model Executor Test (1/2)"
+      agent_pool: mi325_1
      depends_on: amd-build
+      timeout_in_minutes: 70
      mirror_hardwares: [amdproduction]
      grade: Blocking
      commands:
        - export VLLM_ROCM_USE_AITER=0
        # ignore test_teacache_extractors.py because it use rocm gemm kernel from vLLM
        # that is not supported on CPU
-        - "pytest -sv tests/model_executor -m 'core_model and cpu' --num-shards=$$BUILDKITE_PARALLEL_JOB_COUNT --shard-id=$$BUILDKITE_PARALLEL_JOB --cov=vllm_omni --cov-report=term-missing:skip-covered --cov-report=xml:coverage-model-executor-$$BUILDKITE_PARALLEL_JOB.xml"
+        # CPU tests on ROCm gpu machines are very slow, so we give them more time.
+        - "timeout 60m pytest -sv tests/diffusion -m 'core_model and cpu' --ignore=tests/diffusion/cache/test_teacache_extractors.py --cov=vllm_omni --cov-report=term-missing:skip-covered --cov-report=xml"

-    - label: "Simple · Diffusion Test · Shard %N/%t"
-      agent_pool: mi300_1
-      parallelism: 2
+    - label: "Simple · Diffusion & Model Executor Test (2/2)"
+      agent_pool: mi325_1
      depends_on: amd-build
+      timeout_in_minutes: 70
      mirror_hardwares: [amdproduction]
      grade: Blocking
      commands:
        - export VLLM_ROCM_USE_AITER=0
-        # ignore test_teacache_extractors.py because it use rocm gemm kernel from vLLM
-        # that is not supported on CPU
-        - "pytest -sv tests/diffusion -m 'core_model and cpu' --ignore=tests/diffusion/cache/test_teacache_extractors.py --num-shards=$$BUILDKITE_PARALLEL_JOB_COUNT --shard-id=$$BUILDKITE_PARALLEL_JOB --cov=vllm_omni --cov-report=term-missing:skip-covered --cov-report=xml:coverage-diffusion-$$BUILDKITE_PARALLEL_JOB.xml"
-
-    - label: "Simple · Engine&Entrypoints Test"
-      agent_pool: mi300_1
-      depends_on: amd-build
-      mirror_hardwares: [amdproduction]
-      grade: Blocking
-      commands:
-        - export VLLM_ROCM_USE_AITER=0
-        - "pytest -sv tests/entrypoints tests/engine -m 'core_model and cpu' --cov=vllm_omni --cov-report=term-missing:skip-covered --cov-report=xml"
+        # CPU tests on ROCm gpu machines are very slow, so we give them more time.
+        - "timeout 60m pytest -sv tests/model_executor -m 'core_model and cpu' --cov=vllm_omni --cov-report=term-missing:skip-covered --cov-report=xml"

    - label: "Simple · Other Test"
-      agent_pool: mi300_1
+      agent_pool: mi325_1
      depends_on: amd-build
+      timeout_in_minutes: 50
      mirror_hardwares: [amdproduction]
      grade: Blocking
      commands:
        - export VLLM_ROCM_USE_AITER=0
        # ignore test_teacache_extractors.py because it use rocm gemm kernel from vLLM
        # that is not supported on CPU
-        - "pytest -sv tests/ -m 'core_model and cpu' --ignore=tests/diffusion --ignore=tests/model_executor --ignore=tests/entrypoints --ignore=tests/engine  --ignore=tests/diffusion/cache/test_teacache_extractors.py --cov=vllm_omni --cov-report=term-missing:skip-covered --cov-report=xml"
+        - "timeout 40m pytest -sv tests/diffusion tests/model_executor -m 'core_model and cpu' --ignore=tests/diffusion/cache/test_teacache_extractors.py --cov=vllm_omni --cov-report=term-missing:skip-covered --cov-report=xml"

 - group: ":card_index_dividers: Diffusion Test"
  steps:
    - label: "Diffusion · LoRA Test"
-      agent_pool: mi300_1
+      agent_pool: mi325_1
      depends_on: amd-build
      mirror_hardwares: [amdproduction]
      grade: Blocking
-      artifact_paths:
-        - lora-server.log
      commands:
-        - pytest -sv tests/diffusion/lora/ -m 'advanced_model and cuda' --run-level "advanced_model" 2>&1 | tee lora-server.log
+        - timeout 20m pytest -s -v tests/diffusion/lora/test_images_generations_lora.py

    - label: "Diffusion Model CPU offloading Test"
-      agent_pool: mi300_1
+      agent_pool: mi325_1
      depends_on: amd-build
      mirror_hardwares: [amdproduction]
      grade: Blocking
@@ -72,7 +62,7 @@ steps:
        - export VLLM_LOGGING_LEVEL=DEBUG
        - export VLLM_WORKER_MULTIPROC_METHOD=spawn
        - |
-          bash -c '
+          timeout 20m bash -c '
            set +e
            pytest -s -v tests/diffusion/offloader/test_diffusion_cpu_offload.py
            EXIT1=\$?
@@ -82,7 +72,7 @@ steps:
          '

    - label: "Diffusion Sequence Parallelism Test (Need 4 GPUs)"
-      agent_pool: mi300_4
+      agent_pool: mi325_4
      depends_on: amd-build
      mirror_hardwares: [amdproduction]
      grade: Blocking
@@ -94,7 +84,7 @@ steps:

    # merge-only tests
    - label: "Diffusion Tensor Parallelism Test"
-      agent_pool: mi300_2
+      agent_pool: mi325_2
      depends_on: amd-build
      mirror_hardwares: [amdproduction]
      grade: Blocking
@@ -102,7 +92,7 @@ steps:
        - pytest -s -v tests/diffusion/distributed/test_tensor_parallel.py

    - label: "Diffusion Model Test"
-      agent_pool: mi300_1
+      agent_pool: mi325_1
      depends_on: amd-build
      mirror_hardwares: [amdproduction]
      grade: Blocking
@@ -110,7 +100,7 @@ steps:
        - timeout 30m pytest -s -v tests/e2e/offline_inference/test_z_image.py

    - label: "Diffusion GPU Worker Test"
-      agent_pool: mi300_2
+      agent_pool: mi325_2
      depends_on: amd-build
      mirror_hardwares: [amdproduction]
      grade: Blocking
@@ -118,7 +108,7 @@ steps:
        - timeout 20m pytest -s -v tests/diffusion/test_diffusion_worker.py

    - label: "Diffusion · Wan22 Test"
-      agent_pool: mi300_1
+      agent_pool: mi325_1
      depends_on: amd-build
      mirror_hardwares: [amdproduction]
      grade: Blocking
@@ -131,7 +121,7 @@ steps:

 ## ISSUE depends on `diffusers` package: https://github.com/huggingface/diffusers/issues/13274
 # - label: "Audio Generation Model Test"
-#   agent_pool: mi300_1
+#   agent_pool: mi325_1
 #   depends_on: amd-build
 #   mirror_hardwares: [amdproduction]
 #   grade: Blocking
@@ -142,7 +132,7 @@ steps:
 #     - timeout 20m pytest -s -v tests/e2e/offline_inference/test_stable_audio_expansion.py -m "advanced_model and diffusion and L4" --run-level advanced_model

 - label: "Engine Test"
-  agent_pool: mi300_1
+  agent_pool: mi325_1
  depends_on: amd-build
  mirror_hardwares: [amdproduction]
  grade: Blocking
@@ -157,7 +147,7 @@ steps:
 - group: ":card_index_dividers: E2E Test"
  steps:
    - label: "Omni Model Test Qwen2-5-Omni"
-      agent_pool: mi300_4
+      agent_pool: mi325_4
      depends_on: amd-build
      mirror_hardwares: [amdproduction]
      commands:
@@ -165,7 +155,7 @@ steps:
        - pytest -s -v tests/e2e/*/test_qwen2_5_omni_expansion.py --run-level "core_model"

    - label: "Omni Model Test Qwen3-Omni"
-      agent_pool: mi300_2
+      agent_pool: mi325_2
      depends_on: amd-build
      mirror_hardwares: [amdproduction]
      grade: Blocking
@@ -173,23 +163,22 @@ steps:
        - export VLLM_WORKER_MULTIPROC_METHOD=spawn
        - pytest -s -v tests/e2e/offline_inference/test_qwen3_omni.py tests/e2e/online_serving/test_qwen3_omni.py -m 'advanced_model and cuda' --run-level 'advanced_model'

-    - label: "Qwen3-TTS CustomVoice E2E Test · Shard %N/%t"
-      agent_pool: mi300_1
-      parallelism: 2
+    - label: "Qwen3-TTS CustomVoice E2E Test"
+      agent_pool: mi325_1
      depends_on: amd-build
      mirror_hardwares: [amdproduction]
      grade: Blocking
      commands:
        - |
-          bash -c '
+          timeout 50m bash -c '
            export VLLM_LOGGING_LEVEL=DEBUG
            export VLLM_WORKER_MULTIPROC_METHOD=spawn
            export VLLM_ALLOW_LONG_MAX_MODEL_LEN="1"
-            pytest -s -v tests/e2e/online_serving/test_qwen3_tts_customvoice.py tests/e2e/offline_inference/test_qwen3_tts_customvoice.py -m "advanced_model" --run-level "advanced_model" --num-shards=$$BUILDKITE_PARALLEL_JOB_COUNT --shard-id=$$BUILDKITE_PARALLEL_JOB
+            pytest -s -v tests/e2e/online_serving/test_qwen3_tts_customvoice.py tests/e2e/offline_inference/test_qwen3_tts_customvoice.py -m "advanced_model" --run-level "advanced_model"
          '

    - label: "Qwen3-TTS Base E2E Test"
-      agent_pool: mi300_1
+      agent_pool: mi325_1
      depends_on: amd-build
      mirror_hardwares: [amdproduction]
      grade: Blocking
@@ -207,7 +196,7 @@ steps:
 # Need to debug before reneable numerical changes across large PRs
 # # split Bagel Model Test with H100 (Real Weights) into three tests
 # - label: "Bagel Text2Img Model Test (1/3)"
-#   agent_pool: mi300_1
+#   agent_pool: mi325_1
 #   depends_on: amd-build
 #   mirror_hardwares: [amdproduction]
 #   grade: Blocking
@@ -219,7 +208,7 @@ steps:
 #     - timeout 30m pytest -s -v tests/e2e/offline_inference/test_bagel.py -m "advanced_model" --run-level "advanced_model" -k "shared_memory" -k "rocm"

 # - label: "Bagel Img2Img Model Test (2/3)"
-#   agent_pool: mi300_1
+#   agent_pool: mi325_1
 #   depends_on: amd-build
 #   mirror_hardwares: [amdproduction]
 #   grade: Blocking
@@ -231,7 +220,7 @@ steps:
 #     - timeout 30m pytest -s -v tests/e2e/offline_inference/test_bagel.py -m "advanced_model" --run-level "advanced_model" -k "rocm"

 # - label: "Bagel Online Serving Test (3/3)"
-#   agent_pool: mi300_1
+#   agent_pool: mi325_1
 #   depends_on: amd-build
 #   mirror_hardwares: [amdproduction]
 #   grade: Blocking
@@ -7,9 +7,8 @@ steps:

 - group: ":card_index_dividers: Simple Test"
  steps:
-    - label: "Simple · Model Executor Test · Shard %N/%t"
-      agent_pool: mi300_1
-      parallelism: 2
+    - label: "Simple · Diffusion & Model Executor Test"
+      agent_pool: mi325_1
      depends_on: amd-build
      mirror_hardwares: [amdproduction]
      grade: Blocking
@@ -17,30 +16,10 @@ steps:
        - export VLLM_ROCM_USE_AITER=0
        # ignore test_teacache_extractors.py because it use rocm gemm kernel from vLLM
        # that is not supported on CPU
-        - "pytest -sv tests/model_executor -m 'core_model and cpu' --num-shards=$$BUILDKITE_PARALLEL_JOB_COUNT --shard-id=$$BUILDKITE_PARALLEL_JOB --cov=vllm_omni --cov-report=term-missing:skip-covered --cov-report=xml:coverage-model-executor-$$BUILDKITE_PARALLEL_JOB.xml"
-
-    - label: "Simple · Diffusion Test"
-      agent_pool: mi300_1
-      depends_on: amd-build
-      mirror_hardwares: [amdproduction]
-      grade: Blocking
-      commands:
-        - export VLLM_ROCM_USE_AITER=0
-        # ignore test_teacache_extractors.py because it use rocm gemm kernel from vLLM
-        # that is not supported on CPU
-        - "pytest -sv tests/diffusion -m 'core_model and cpu'  --ignore=tests/diffusion/cache/test_teacache_extractors.py --cov=vllm_omni --cov-report=term-missing:skip-covered --cov-report=xml"
-
-    - label: "Simple · Engine&Entrypoints Test"
-      agent_pool: mi300_1
-      depends_on: amd-build
-      mirror_hardwares: [amdproduction]
-      grade: Blocking
-      commands:
-        - export VLLM_ROCM_USE_AITER=0
-        - "pytest -sv tests/entrypoints tests/engine -m 'core_model and cpu' --cov=vllm_omni --cov-report=term-missing:skip-covered --cov-report=xml"
+        - "timeout 40m pytest -sv tests/diffusion tests/model_executor -m 'core_model and cpu' --ignore=tests/diffusion/cache/test_teacache_extractors.py --cov=vllm_omni --cov-report=term-missing:skip-covered --cov-report=xml"

    - label: "Simple · Other Test"
-      agent_pool: mi300_1
+      agent_pool: mi325_1
      depends_on: amd-build
      mirror_hardwares: [amdproduction]
      grade: Blocking
@@ -48,19 +27,19 @@ steps:
        - export VLLM_ROCM_USE_AITER=0
        # ignore test_teacache_extractors.py because it use rocm gemm kernel from vLLM
        # that is not supported on CPU
-        - "pytest -sv tests/ -m 'core_model and cpu' --ignore=tests/diffusion --ignore=tests/model_executor --ignore=tests/entrypoints --ignore=tests/engine  --ignore=tests/diffusion/cache/test_teacache_extractors.py --cov=vllm_omni --cov-report=term-missing:skip-covered --cov-report=xml"
+        - "timeout 40m pytest -sv tests/diffusion tests/model_executor -m 'core_model and cpu' --ignore=tests/diffusion/cache/test_teacache_extractors.py --cov=vllm_omni --cov-report=term-missing:skip-covered --cov-report=xml"

 - label: "Custom Pipeline Test"
-  agent_pool: mi300_1
+  agent_pool: mi325_1
  depends_on: amd-build
  mirror_hardwares: [amdproduction]
  grade: Blocking
  commands:
-    - pytest -s -v tests/e2e/features/custom_pipeline/ -m "core_model"
+    - timeout 20m pytest -s -v tests/e2e/features/custom_pipeline/ -m "core_model"


 - label: "Voxtral TTS CUDA Unit Test"
-  agent_pool: mi300_1
+  agent_pool: mi325_1
  depends_on: amd-build
  mirror_hardwares: [amdproduction]
  grade: Blocking
@@ -70,25 +49,33 @@ steps:
 - group: ":card_index_dividers: Diffusion Test"
  steps:
    - label: "Diffusion · Batch Test"
-      agent_pool: mi300_1
+      agent_pool: mi325_1
      depends_on: amd-build
      mirror_hardwares: [amdproduction]
      grade: Blocking
      commands:
-        - pytest -sv tests/diffusion/batching -m 'core_model and cuda' --run-level "core_model"
+        - timeout 20m pytest -sv tests/diffusion/batching -m 'core_model and cuda' --run-level "core_model"

    - label: "Diffusion · Offloader Test"
-      agent_pool: mi300_1
+      agent_pool: mi325_1
      depends_on: amd-build
      mirror_hardwares: [amdproduction]
      grade: Blocking
      commands:
        - export VLLM_LOGGING_LEVEL=DEBUG
        - export VLLM_WORKER_MULTIPROC_METHOD=spawn
-        - pytest -s -v tests/diffusion/offloader -m "core_model and cuda" --run-level "core_model"
+        - |
+          timeout 20m bash -c '
+            set +e
+            pytest -s -v tests/diffusion/offloader/test_diffusion_cpu_offload.py
+            EXIT1=\$?
+            pytest -s -v tests/diffusion/offloader/test_diffusion_layerwise_offload.py
+            EXIT2=\$?
+            exit \$((EXIT1 | EXIT2))
+          '

    - label: "Diffusion · Cache Test"
-      agent_pool: mi300_1
+      agent_pool: mi325_1
      depends_on: amd-build
      mirror_hardwares: [amdproduction]
      grade: Blocking
@@ -96,10 +83,10 @@ steps:
        - export GPU_ARCHS=gfx942
        - export VLLM_LOGGING_LEVEL=DEBUG
        - export VLLM_WORKER_MULTIPROC_METHOD=spawn
-        - pytest -sv tests/diffusion/cache -m 'core_model and cuda' --run-level "core_model"
+        - timeout 15m pytest -s -v -m "core_model and cache and diffusion and not distributed_cuda and L4"

    - label: "Diffusion Sequence Parallelism Test"
-      agent_pool: mi300_2
+      agent_pool: mi325_2
      depends_on: amd-build
      mirror_hardwares: [amdproduction]
      grade: Blocking
@@ -109,7 +96,7 @@ steps:
        - timeout 20m pytest -s -v tests/diffusion/distributed/test_sequence_parallel.py -m core_model

    - label: "Diffusion GPU Worker Test"
-      agent_pool: mi300_2
+      agent_pool: mi325_2
      depends_on: amd-build
      mirror_hardwares: [amdproduction]
      grade: Blocking
@@ -117,7 +104,7 @@ steps:
        - timeout 20m pytest -s -v tests/diffusion/test_diffusion_worker.py

    - label: "Diffusion · Model Test"
-      agent_pool: mi300_1
+      agent_pool: mi325_1
      depends_on: amd-build
      mirror_hardwares: [amdproduction]
      grade: Blocking
@@ -125,7 +112,7 @@ steps:
        - timeout 15m pytest -sv tests/diffusion/models/ -m 'core_model and cuda' --run-level "core_model"

    - label: "Diffusion · Wan22 Test"
-      agent_pool: mi300_1
+      agent_pool: mi325_1
      depends_on: amd-build
      mirror_hardwares: [amdproduction]
      grade: Blocking
@@ -139,7 +126,7 @@ steps:

 ## ISSUE depends on `diffusers` package: https://github.com/huggingface/diffusers/issues/13274
 # - label: "Audio Generation Model Test"
-#   agent_pool: mi300_1
+#   agent_pool: mi325_1
 #   depends_on: amd-build
 #   mirror_hardwares: [amdproduction]
 #   grade: Blocking
@@ -150,7 +137,7 @@ steps:
 #     - timeout 20m pytest -s -v tests/e2e/offline_inference/test_stable_audio_expansion.py -m "advanced_model and diffusion and L4" --run-level advanced_model

 - label: "Engine Test"
-  agent_pool: mi300_1
+  agent_pool: mi325_1
  depends_on: amd-build
  mirror_hardwares: [amdproduction]
  grade: Blocking
@@ -162,7 +149,7 @@ steps:
      '

 # - label: "Omni Model Test Qwen3-Omni"
-#   agent_pool: mi300_2
+#   agent_pool: mi325_2
 #   depends_on: amd-build
 #   mirror_hardwares: [amdproduction]
 #   grade: Blocking
@@ -175,7 +162,7 @@ steps:
 - group: ":card_index_dividers: E2E Test"
  steps:
    - label: "Qwen3-TTS E2E Test"
-      agent_pool: mi300_1
+      agent_pool: mi325_1
      depends_on: amd-build
      mirror_hardwares: [amdproduction]
      grade: Blocking
@@ -186,7 +173,7 @@ steps:
        - timeout 30m pytest -s -v tests/e2e/online_serving/test_qwen3_tts_customvoice.py -m "core_model" --run-level "core_model"

    - label: "CosyVoice3-TTS E2E Test"
-      agent_pool: mi300_1
+      agent_pool: mi325_1
      depends_on: amd-build
      mirror_hardwares: [amdproduction]
      grade: Blocking
@@ -199,7 +186,7 @@ steps:
 # TODO: Bagel test on ROCm is very unstable. @tjtanaa
 # Need to debug before reneable numerical changes across large PRs
 # - label: "Bagel Text2Img Model Test"
-#   agent_pool: mi300_1
+#   agent_pool: mi325_1
 #   depends_on: amd-build
 #   mirror_hardwares: [amdproduction]
 #   grade: Blocking
@@ -211,7 +198,7 @@ steps:
 #     - timeout 30m pytest -s -v tests/e2e/offline_inference/test_bagel.py -m "core_model" --run-level "core_model" -k "rocm"

 # - label: "Bagel Img2Img Model Test"
-#   agent_pool: mi300_1
+#   agent_pool: mi325_1
 #   depends_on: amd-build
 #   mirror_hardwares: [amdproduction]
 #   grade: Blocking
@@ -223,7 +210,7 @@ steps:
 #     - timeout 30m pytest -s -v tests/e2e/offline_inference/test_bagel.py -m "core_model" --run-level "core_model" -k "rocm"

 # - label: "Bagel Online Serving Test"
-#   agent_pool: mi300_1
+#   agent_pool: mi325_1
 #   depends_on: amd-build
 #   mirror_hardwares: [amdproduction]
 #   grade: Blocking
@@ -1,65 +1,11 @@
 {# vllm-omni customized version
   Based on: https://github.com/vllm-project/ci-infra/blob/main/buildkite/test-template-amd.j2
-   Last synced: 2026-08-04
-   Modifications: Use the shared MI300 queues and Omni command-passing contract
+   Last synced: 2025-12-15
+   Modifications: Removed unused CUDA/NVIDIA logic, keeping only AMD tests
 #}
 {% set docker_image_amd = "rocm/vllm-omni:$BUILDKITE_COMMIT" %}
 {% set default_working_dir = "/app/vllm-omni" %}

-{# MI300 runs tests natively in Kubernetes; Docker-in-Docker is unavailable. #}
-{% macro amd_native_k8s_plugin(indent, step) -%}
-{{ indent }}plugins:
-{{ indent }}  - kubernetes:
-{{ indent }}      podSpecPatch:
-{{ indent }}        automountServiceAccountToken: false
-{{ indent }}        securityContext:
-{{ indent }}          seccompProfile:
-{{ indent }}            type: RuntimeDefault
-{{ indent }}        imagePullSecrets:
-{{ indent }}          - name: docker-config
-{{ indent }}        containers:
-{{ indent }}          - name: container-0
-{{ indent }}            image: {{ docker_image_amd }}
-{{ indent }}            imagePullPolicy: Always
-{{ indent }}            securityContext:
-{{ indent }}              allowPrivilegeEscalation: false
-{{ indent }}              capabilities:
-{{ indent }}                add:
-{{ indent }}                  - IPC_LOCK
-{{ indent }}            resources:
-{{ indent }}              limits:
-{{ indent }}                amd.com/gpu: "{{ step.agent_pool[-1:] }}"
-{{ indent }}              requests:
-{{ indent }}                amd.com/gpu: "{{ step.agent_pool[-1:] }}"
-{{ indent }}            volumeMounts:
-{{ indent }}              - name: devshm
-{{ indent }}                mountPath: /dev/shm
-{{ indent }}            env:
-{{ indent }}              - name: AMD_CI_RUNTIME
-{{ indent }}                value: native
-{{ indent }}              - name: NATIVE_CI
-{{ indent }}                value: "true"
-{{ indent }}              - name: VLLM_CI_DOCKER_DISABLED
-{{ indent }}                value: "1"
-{{ indent }}              - name: VLLM_CI_EXPECTED_GPU_COUNT
-{{ indent }}                value: "{{ step.agent_pool[-1:] }}"
-{{ indent }}              - name: HF_HOME
-{{ indent }}                value: /home/buildkite-agent/huggingface
-{{ indent }}              - name: MIOPEN_DEBUG_CONV_DIRECT
-{{ indent }}                value: "0"
-{{ indent }}              - name: MIOPEN_DEBUG_CONV_GEMM
-{{ indent }}                value: "0"
-{{ indent }}              - name: VLLM_ROCM_USE_AITER
-{{ indent }}                value: "0"
-{{ indent }}              - name: PYTORCH_ROCM_ARCH
-{{ indent }}                value: ""
-{{ indent }}        volumes:
-{{ indent }}          - name: devshm
-{{ indent }}            emptyDir:
-{{ indent }}              medium: Memory
-{{ indent }}              sizeLimit: 16Gi
-{%- endmacro %}
-
 {% if env %}
 env:
 {% for name in env %}
@@ -107,31 +53,19 @@ steps:
          {% if step.agent_pool %}
          queue: amd_{{ step.agent_pool }}
          {% else %}
-          queue: amd_mi300_1
+          queue: amd_mi325_1
          {% endif %}
-{{ amd_native_k8s_plugin("        ", step) }}
 {% set cmd_body = (step.command or (step.commands | join("\n"))) | trim %}
 {% set indented_cmd = cmd_body | replace("\n", "\n            ") %}
        command: bash .buildkite/amd/scripts/run-amd-test.sh
        env:
-          AMD_CI_RUNTIME: "native"
-          NATIVE_CI: "true"
-          VLLM_CI_DOCKER_DISABLED: "1"
-          VLLM_CI_EXPECTED_GPU_COUNT: "{{ step.agent_pool[-1:] }}"
-          VLLM_CI_REQUIRE_PERSISTENT_HF_CACHE: "1"
-          HF_HOME: "/home/buildkite-agent/huggingface"
-          HF_HUB_DOWNLOAD_TIMEOUT: "300"
-          HF_HUB_ETAG_TIMEOUT: "60"
-          MIOPEN_DEBUG_CONV_DIRECT: "0"
-          MIOPEN_DEBUG_CONV_GEMM: "0"
-          VLLM_ROCM_USE_AITER: "0"
-          PYTORCH_ROCM_ARCH: ""
+          DOCKER_BUILDKIT: "1"
 {% if step.env %}
 {% for name in step.env %}
          {{ name }}: "{{ step.env[name] }}"
 {% endfor %}
 {% endif %}
-          TEST_COMMANDS: |-
+          TEST_COMMAND: |-
            (command rocm-smi || true) && cd {{ (step.working_dir or default_working_dir) | safe }}
 {% if env %}
 {% for name in env %}
@@ -148,15 +82,6 @@ steps:
 {% endif %}
            {{ indented_cmd | safe }}
        priority: 100
-{% if step.parallelism %}
-        parallelism: {{ step.parallelism }}
-{% endif %}
-{% if step.artifact_paths %}
-        artifact_paths:
-{% for path in step.artifact_paths %}
-          - "{{ path }}"
-{% endfor %}
-{% endif %}
        {% if step.timeout_in_minutes %}
        timeout_in_minutes: {{ step.timeout_in_minutes }}
        {% endif %}
@@ -175,31 +100,19 @@ steps:
      {% if step.agent_pool %}
      queue: amd_{{ step.agent_pool }}
      {% else %}
-      queue: amd_mi300_1
+      queue: amd_mi325_1
      {% endif %}
-{{ amd_native_k8s_plugin("    ", step) }}
 {% set cmd_body = (step.command or (step.commands | join("\n"))) | trim %}
 {% set indented_cmd = cmd_body | replace("\n", "\n        ") %}
    command: bash .buildkite/amd/scripts/run-amd-test.sh
    env:
-      AMD_CI_RUNTIME: "native"
-      NATIVE_CI: "true"
-      VLLM_CI_DOCKER_DISABLED: "1"
-      VLLM_CI_EXPECTED_GPU_COUNT: "{{ step.agent_pool[-1:] }}"
-      VLLM_CI_REQUIRE_PERSISTENT_HF_CACHE: "1"
-      HF_HOME: "/home/buildkite-agent/huggingface"
-      HF_HUB_DOWNLOAD_TIMEOUT: "300"
-      HF_HUB_ETAG_TIMEOUT: "60"
-      MIOPEN_DEBUG_CONV_DIRECT: "0"
-      MIOPEN_DEBUG_CONV_GEMM: "0"
-      VLLM_ROCM_USE_AITER: "0"
-      PYTORCH_ROCM_ARCH: ""
+      DOCKER_BUILDKIT: "1"
 {% if step.env %}
 {% for name in step.env %}
      {{ name }}: "{{ step.env[name] }}"
 {% endfor %}
 {% endif %}
-      TEST_COMMANDS: |-
+      TEST_COMMAND: |-
        (command rocm-smi || true) && cd {{ (step.working_dir or default_working_dir) | safe }}
 {% if env %}
 {% for name in env %}
@@ -216,15 +129,6 @@ steps:
 {% endif %}
        {{ indented_cmd | safe }}
    priority: 100
-{% if step.parallelism %}
-    parallelism: {{ step.parallelism }}
-{% endif %}
-{% if step.artifact_paths %}
-    artifact_paths:
-{% for path in step.artifact_paths %}
-      - "{{ path }}"
-{% endfor %}
-{% endif %}
    {% if step.timeout_in_minutes %}
    timeout_in_minutes: {{ step.timeout_in_minutes }}
    {% endif %}
@@ -9,11 +9,6 @@
 #   a2b3_npu_1  — ascend-a2b3, resource_class npu-1 (A2/B3 CI image)
 #   a2b3_npu_4  — ascend-a2b3, resource_class npu-4
 #   a3_npu_2    — ascend-a3, resource_class npu-2
-#
-# The ``l4_*`` presets run under the ``docker`` plugin, which does not put
-# ``buildkite-agent`` on PATH inside the container the way the ``kubernetes``
-# presets do, so they set ``mount-buildkite-agent: true``; without it any step
-# calling ``buildkite-agent`` (artifact upload, annotate, meta-data) fails there.

 x-npu-k8s-plugins: &npu_k8s_plugins
  - kubernetes:
@@ -31,7 +26,6 @@ mirror_hardwares:
          image: public.ecr.aws/q9t5s3a7/vllm-ci-test-repo:$BUILDKITE_COMMIT
          always-pull: true
          propagate-environment: true
-          mount-buildkite-agent: true
          shm-size: "8gb"
          environment:
            - HF_HOME=/fsx/hf_cache
@@ -47,7 +41,6 @@ mirror_hardwares:
          image: public.ecr.aws/q9t5s3a7/vllm-ci-test-repo:$BUILDKITE_COMMIT
          always-pull: true
          propagate-environment: true
-          mount-buildkite-agent: true
          shm-size: "8gb"
          environment:
            - HF_HOME=/fsx/hf_cache
@@ -1,82 +0,0 @@
-#!/usr/bin/env bash
-# Run a model's E2E tests once per entry mode as separate coverage runs and upload
-# the reports, so per-mode attribution survives (see vllm-project/vllm-omni#5332).
-#
-# Usage: run_cov_split.sh --model-id <id> [--offline <paths>] [--online <paths>] \
-#                         -- <pytest args...>
-#
-#   --model-id  Names the artifacts: coverage-<id>-{offline,online}-<step id>.xml.gz.
-#               Use the model's directory name under vllm_omni/*/models/.
-#   --offline   Pytest path(s) for the offline half. Repeatable.
-#   --online    Pytest path(s) for the online half. Repeatable.
-#   --          Everything after this is forwarded verbatim to every pytest run,
-#               quoting preserved: the job's own -m expression, --run-level, and
-#               anything else it needs (e.g. --test-config-file).
-#
-# At least one of --offline/--online is required, so a job with only one mode runs
-# just that half. Total runtime is bounded by the step's timeout_in_minutes.
-#
-# Exits non-zero if any half or the upload failed.
-set -uo pipefail
-
-MODEL_ID=""
-OFFLINE=()
-ONLINE=()
-PYTEST_ARGS=()
-
-while [[ $# -gt 0 ]]; do
-    case "$1" in
-        --model-id) MODEL_ID="$2"; shift 2 ;;
-        --offline)  OFFLINE+=("$2"); shift 2 ;;
-        --online)   ONLINE+=("$2"); shift 2 ;;
-        --)         shift; PYTEST_ARGS=("$@"); break ;;
-        *) echo "run_cov_split.sh: unknown argument: $1" >&2; exit 2 ;;
-    esac
-done
-
-if [[ -z "${MODEL_ID}" ]]; then
-    echo "run_cov_split.sh: missing --model-id" >&2
-    exit 2
-fi
-
-if ((${#OFFLINE[@]} == 0 && ${#ONLINE[@]} == 0)); then
-    echo "run_cov_split.sh: need at least one of --offline / --online" >&2
-    exit 2
-fi
-
-# Two steps can test the same model, and artifacts are scoped to the build (a
-# nightly one carries the ready, merge and nightly tiers at once), so unsuffixed
-# reports would share a path -- a glob download then races to rename onto one file.
-# Not BUILDKITE_JOB_ID: the step id survives retries, so attempts collapse under
-# Buildkite's latest-attempt lookup instead of accumulating. A parallel step would
-# need BUILDKITE_PARALLEL_JOB as well; no pilot is one.
-REPORT_SUFFIX="${BUILDKITE_STEP_ID:-local}"
-OFFLINE_REPORT="coverage-${MODEL_ID}-offline-${REPORT_SUFFIX}.xml"
-ONLINE_REPORT="coverage-${MODEL_ID}-online-${REPORT_SUFFIX}.xml"
-
-run_half() {
-    local mode="$1"
-    shift
-    local report="coverage-${MODEL_ID}-${mode}-${REPORT_SUFFIX}.xml"
-    echo "--- coverage: ${MODEL_ID} ${mode}"
-    pytest -s -v "$@" "${PYTEST_ARGS[@]}" --cov=vllm_omni --cov-report="xml:${report}"
-    local status=$?
-    # Cobertura lists every statement in vllm_omni whether or not it ran, so the
-    # report is ~7MB no matter how little the job covers. The repetition is what
-    # dominates it, and gzip takes that to ~400KB.
-    gzip -9 -f "${report}" || status=1
-    return "${status}"
-}
-
-# Clear both modes, not just the ones being run: the upload glob matches both, so
-# a report left by an earlier run would otherwise be published as if the mode it
-# belongs to had run this time.
-rm -f "${OFFLINE_REPORT}" "${ONLINE_REPORT}" "${OFFLINE_REPORT}.gz" "${ONLINE_REPORT}.gz"
-
-EXIT=0
-((${#OFFLINE[@]})) && { run_half offline "${OFFLINE[@]}" || EXIT=1; }
-((${#ONLINE[@]})) && { run_half online "${ONLINE[@]}" || EXIT=1; }
-
-buildkite-agent artifact upload "coverage-${MODEL_ID}-*-${REPORT_SUFFIX}.xml.gz" || EXIT=1
-
-exit "${EXIT}"
@@ -94,19 +94,13 @@ steps:
          - vllm_omni/model_executor/models/qwen3_tts/
          - vllm_omni/model_executor/stage_input_processors/qwen3_tts.py
          - vllm_omni/deploy/qwen3_tts.yaml
-          - .buildkite/common/scripts/run_cov_split.sh
-          - pyproject.toml
-        # 40 -> 60: the coverage split runs the model twice.
-        timeout_in_minutes: 60
        commands:
          - |
-            export VLLM_LOGGING_LEVEL=DEBUG
-            export VLLM_ALLOW_LONG_MAX_MODEL_LEN=1
-            .buildkite/common/scripts/run_cov_split.sh \
-              --model-id qwen3_tts \
-              --offline tests/e2e/offline_inference/test_qwen3_tts_base.py \
-              --online tests/e2e/online_serving/test_qwen3_tts_base.py \
-              -- -m 'advanced_model and cuda' --run-level 'advanced_model'
+            timeout 40m bash -c "
+              export VLLM_LOGGING_LEVEL=DEBUG
+              export VLLM_ALLOW_LONG_MAX_MODEL_LEN=1
+              pytest -s -v tests/e2e/online_serving/test_qwen3_tts_base.py tests/e2e/offline_inference/test_qwen3_tts_base.py -m 'advanced_model and cuda' --run-level 'advanced_model'
+            "
        mirror_hardwares: l4_1

      - label: "TTS · Higgs-Audio-V3 Test"
@@ -209,17 +203,9 @@ steps:
          - vllm_omni/diffusion/models/bagel/
          - vllm_omni/model_executor/stage_input_processors/bagel.py
          - vllm_omni/deploy/bagel.yaml
-          - .buildkite/common/scripts/run_cov_split.sh
-          - pyproject.toml
-        # 20 -> 40: the coverage split runs the model twice.
-        timeout_in_minutes: 40
+        timeout_in_minutes: 20
        commands:
-          - |
-            .buildkite/common/scripts/run_cov_split.sh \
-              --model-id bagel \
-              --offline tests/e2e/offline_inference/test_bagel.py \
-              --online tests/e2e/online_serving/test_bagel.py \
-              -- -m 'advanced_model and cuda' --run-level 'advanced_model'
+          - pytest -s -v tests/e2e/offline_inference/test_bagel.py tests/e2e/online_serving/test_bagel.py -m 'advanced_model and cuda' --run-level 'advanced_model'
        mirror_hardwares: h100_1

      - label: "Diffusion · Qwen Image Test"
@@ -345,7 +345,7 @@ steps:
        commands:
          - export DIFFUSION_BENCHMARK_DIR=tests/dfx/perf/results
          - export DIFFUSION_ATTENTION_BACKEND=FLASH_ATTN
-          - export CACHE_DIT_VERSION=1.5.0
+          - export CACHE_DIT_VERSION=1.3.0
          - |
            set +e
            pytest -s -v tests/dfx/perf/scripts/run_diffusion_benchmark.py --test-config-file tests/dfx/perf/tests/test_qwen_image_vllm_omni.json
@@ -361,7 +361,7 @@ steps:
        commands:
          - export DIFFUSION_BENCHMARK_DIR=tests/dfx/perf/results
          - export DIFFUSION_ATTENTION_BACKEND=FLASH_ATTN
-          - export CACHE_DIT_VERSION=1.5.0
+          - export CACHE_DIT_VERSION=1.3.0
          - |
            set +e
            pytest -s -v tests/dfx/perf/scripts/run_diffusion_benchmark.py --test-config-file tests/dfx/perf/tests/test_qwen_image_edit_vllm_omni.json
@@ -377,7 +377,7 @@ steps:
        commands:
          - export DIFFUSION_BENCHMARK_DIR=tests/dfx/perf/results
          - export DIFFUSION_ATTENTION_BACKEND=FLASH_ATTN
-          - export CACHE_DIT_VERSION=1.5.0
+          - export CACHE_DIT_VERSION=1.3.0
          - |
            set +e
            pytest -s -v tests/dfx/perf/scripts/run_diffusion_benchmark.py --test-config-file tests/dfx/perf/tests/test_qwen_image_edit_2511_vllm_omni.json
@@ -393,7 +393,7 @@ steps:
        commands:
          - export DIFFUSION_BENCHMARK_DIR=tests/dfx/perf/results
          - export DIFFUSION_ATTENTION_BACKEND=FLASH_ATTN
-          - export CACHE_DIT_VERSION=1.5.0
+          - export CACHE_DIT_VERSION=1.3.0
          - |
            set +e
            pytest -s -v tests/dfx/perf/scripts/run_diffusion_benchmark.py --test-config-file tests/dfx/perf/tests/test_qwen_image_layered_vllm_omni.json
@@ -409,7 +409,7 @@ steps:
        commands:
          - export DIFFUSION_BENCHMARK_DIR=tests/dfx/perf/results
          - export DIFFUSION_ATTENTION_BACKEND=FLASH_ATTN
-          - export CACHE_DIT_VERSION=1.5.0
+          - export CACHE_DIT_VERSION=1.3.0
          - |
            set +e
            pytest -s -v tests/dfx/perf/scripts/run_diffusion_benchmark.py --test-config-file tests/dfx/perf/tests/test_bagel_vllm_omni.json
@@ -456,7 +456,7 @@ steps:
        timeout_in_minutes: 90
        commands:
          - pytest -s -v tests/e2e/offline_inference/test_wan22_autoround_w4a16_expansion.py -m "full_model and cuda" --run-level "full_model"
-          - pytest -s -v tests/e2e/online_serving/test_wan_2_1_vace_expansion.py tests/e2e/online_serving/test_ltx.py -m "full_model and cuda" --run-level "full_model"
+          - pytest -s -v tests/e2e/online_serving/test_wan_2_1_vace_expansion.py tests/e2e/online_serving/test_ltx2_expansion.py -m "full_model and cuda" --run-level "full_model"
        mirror_hardwares: h100_2

      - label: ":full_moon: Diffusion X2V · Wan2.2 Accuracy Test"
@@ -477,16 +477,10 @@ steps:
        commands:
          - pytest -s -v tests/e2e/accuracy/hunyuanvideo15_t2v/test_hunyuanvideo15_t2v_video_similarity.py -m full_model --run-level full_model
          - pytest -s -v tests/e2e/accuracy/hunyuanvideo15_i2v/test_hunyuanvideo15_i2v_video_similarity.py -m full_model --run-level full_model
+          - pytest -s -v 'tests/e2e/accuracy/ltx/test_ltx_official_similarity.py::test_ltx_one_stage_matches_official[ltx2_3_i2v]' -m full_model --run-level full_model
          - pytest -s -v tests/e2e/accuracy/test_video_streaming_output_similarity.py -m full_model --run-level full_model
        mirror_hardwares: h100_2

-      - label: ":full_moon: Diffusion X2V · LTX Accuracy Test"
-        timeout_in_minutes: 180
-        commands:
-          - pytest -s -v 'tests/e2e/accuracy/ltx/test_ltx_official_similarity.py::test_ltx_matches_official[ltx2_3_i2v]' -m full_model --run-level full_model
-          - pytest -s -v 'tests/e2e/accuracy/ltx/test_ltx_official_similarity.py::test_ltx_matches_official[ltx23_two_stage_layer_fused_i2v]' -m full_model --run-level full_model
-        mirror_hardwares: h100_1
-
      - label: ":full_moon: Diffusion X2V · Perf Test"
        key: nightly-diffusion-x2v-performance
        timeout_in_minutes: 180
@@ -227,18 +227,6 @@ steps:
            "
        mirror_hardwares: h100_1

-      - label: "Omni · MiniCPM-o 4.5 Perf Test"
-        timeout_in_minutes: 60
-        source_file_dependencies:
-          - tests/dfx/perf/tests/test_minicpmo_4_5_ready.json
-          - vllm_omni/deploy/minicpmo_4_5.yaml
-          - vllm_omni/model_executor/models/minicpmo_4_5/
-          - vllm_omni/model_executor/stage_input_processors/minicpmo_4_5_omni.py
-        commands:
-          - export BENCHMARK_DIR=tests/dfx/perf/results
-          - pytest -s -v tests/dfx/perf/scripts/run_benchmark.py --test-config-file tests/dfx/perf/tests/test_minicpmo_4_5_ready.json -m 'core_model and cuda'
-        mirror_hardwares: h100_1
-
      - label: "TTS · VoxCPM2 Test"
        source_file_dependencies:
          - tests/e2e/online_serving/test_voxcpm2_tts.py
@@ -87,9 +87,8 @@ time timeout -k 30 30m docker run \
    echo $ZE_AFFINITY_MASK
    pip install tblib==3.1.0
    cd /workspace/vllm-omni
-    XPU_TEST_PATHS="tests/diffusion tests/dfx tests/e2e"
-    pytest -v -s $XPU_TEST_PATHS -m "core_model and xpu and B60"
+    pytest -v -s -m "core_model and xpu and B60"
    pytest -v -s tests/diffusion/quantization/test_mxfp8_config.py
-    pytest -v -s $XPU_TEST_PATHS -m "advanced_model and xpu and B60"
-    pytest -v -s $XPU_TEST_PATHS -m "omni and xpu and B60"
+    pytest -v -s -m "advanced_model and xpu and B60"
+    pytest -v -s -m "omni and xpu and B60"
 '
@@ -115,7 +115,7 @@ steps:
          DIFFUSION_ATTENTION_BACKEND: TORCH_SDPA
        commands:
          - export DIFFUSION_BENCHMARK_DIR=tests/dfx/perf/results
-          - export CACHE_DIT_VERSION=1.5.0
+          - export CACHE_DIT_VERSION=1.3.0
          - |
            set +e
            pytest -s -v tests/dfx/perf/scripts/run_diffusion_benchmark.py -m npu --test-config-file tests/dfx/perf/tests/test_qwen_image_edit_2511_vllm_omni.json
@@ -17,15 +17,6 @@ steps:
          VLLM_ALLOW_LONG_MAX_MODEL_LEN: "1"
        commands:
          - pytest -s -v tests/e2e/online_serving/test_minicpmo_4_5_duplex.py -m 'core_model and npu and A3 and omni' --run-level 'core_model'
-      - label: "Omni · MiniCPM-o 4.5 Perf Test"
-        timeout_in_minutes: 60
-        mirror_hardwares: a3_npu_2
-        env:
-          VLLM_WORKER_MULTIPROC_METHOD: spawn
-          VLLM_ALLOW_LONG_MAX_MODEL_LEN: "1"
-        commands:
-          - export BENCHMARK_DIR=tests/dfx/perf/results
-          - pytest -s -v tests/dfx/perf/scripts/run_benchmark.py --test-config-file tests/dfx/perf/tests/test_minicpmo_4_5_ready.json -m 'core_model and npu and A3 and omni'

  - group: ":card_index_dividers: TTS Model Test"
    key: ready-tts-group
@@ -40,11 +40,9 @@ steps:
    commands:
      - "bash .buildkite/release/scripts/publish-release-wheels-pypi.sh"

-  # Auto-skip when NIGHTLY=1 (scheduled); otherwise require manual unblock.
  - block: "Unblock to build release Docker images"
    depends_on: ~
    key: block-build-release-images
-    if: build.env("NIGHTLY") != "1"

  - group: "Build release Docker images"
    key: "build-release-images"
@@ -65,7 +63,7 @@ steps:
              --progress plain \
              -f docker/Dockerfile.cuda .
          - "docker push public.ecr.aws/q9t5s3a7/vllm-omni-release-repo:$BUILDKITE_COMMIT-$(uname -m)"
-          # Fallback default tag (no arch suffix) if arm64 build fails.
+          # re-tag to default image tag and push, just in case arm64 build fails
          - "docker tag public.ecr.aws/q9t5s3a7/vllm-omni-release-repo:$BUILDKITE_COMMIT-$(uname -m) public.ecr.aws/q9t5s3a7/vllm-omni-release-repo:$BUILDKITE_COMMIT"
          - "docker push public.ecr.aws/q9t5s3a7/vllm-omni-release-repo:$BUILDKITE_COMMIT"
        env:
@@ -88,26 +86,6 @@ steps:
        env:
          DOCKER_BUILDKIT: "1"

-  # NIGHTLY=1 only: promote ECR images to DockerHub nightly tags, then prune.
-  - label: "Publish nightly multi-arch image to DockerHub"
-    depends_on:
-      - build-release-image-x86
-      - build-release-image-arm64
-    if: build.env("NIGHTLY") == "1"
-    key: publish-nightly-images-dockerhub
-    agents:
-      queue: small_cpu_queue_release
-    commands:
-      - "bash .buildkite/release/scripts/publish-release-images.sh nightly"
-      - "bash .buildkite/release/scripts/cleanup-nightly-builds.sh"
-    plugins:
-      - docker-login#v3.0.0:
-          username: vllmbot
-          password-env: DOCKERHUB_TOKEN
-    env:
-      DOCKER_BUILDKIT: "1"
-      DOCKERHUB_USERNAME: "vllmbot"
-
  - block: "Publish release images to DockerHub"
    key: block-publish-release-images
    depends_on:
@@ -1,147 +0,0 @@
-#!/bin/bash
-# SPDX-License-Identifier: Apache-2.0
-#
-# Clean up old nightly builds from DockerHub (vllm/vllm-omni), keeping the
-# newest 14 tags with the nightly- prefix.
-
-set -ex
-
-TAG_PREFIX="nightly-"
-REPO="vllm/vllm-omni"
-REPO_API_URL="https://hub.docker.com/v2/repositories/${REPO}/tags"
-
-echo "Cleaning up tags with prefix: $TAG_PREFIX in repository: $REPO"
-
-if [ -z "$DOCKERHUB_TOKEN" ]; then
-  echo "Error: DOCKERHUB_TOKEN environment variable is not set"
-  exit 1
-fi
-
-if [ -z "$DOCKERHUB_USERNAME" ]; then
-  echo "Error: DOCKERHUB_USERNAME environment variable is not set"
-  exit 1
-fi
-
-echo "Getting DockerHub bearer token..."
-set +x
-BEARER_TOKEN=$(curl -s -X POST \
-  -H "Content-Type: application/json" \
-  -d "{\"username\": \"$DOCKERHUB_USERNAME\", \"password\": \"$DOCKERHUB_TOKEN\"}" \
-  "https://hub.docker.com/v2/users/login" | jq -r '.token')
-set -x
-
-if [ -z "$BEARER_TOKEN" ] || [ "$BEARER_TOKEN" = "null" ]; then
-  echo "Error: Failed to get DockerHub bearer token"
-  exit 1
-fi
-
-get_all_tags() {
-  local page=1
-  local all_tags=""
-  # Hub `name` is a partial match (not a strict prefix). Use it to narrow the
-  # list, then enforce startswith() client-side. Exhaust API pages; do not
-  # stop merely because a page has no matching tags after filtering.
-  local name_query
-  name_query=$(printf '%s' "$TAG_PREFIX" | jq -sRr @uri)
-
-  while true; do
-    set +x
-    local response
-    response=$(curl -s -H "Authorization: Bearer $BEARER_TOKEN" \
-      "$REPO_API_URL?page=$page&page_size=100&name=${name_query}")
-    set -x
-
-    local page_count
-    page_count=$(echo "$response" | jq -r '.results | length')
-    if [ -z "$page_count" ] || [ "$page_count" = "0" ] || [ "$page_count" = "null" ]; then
-      break
-    fi
-
-    local tags
-    tags=$(echo "$response" | jq -r --arg prefix "$TAG_PREFIX" \
-      '.results[] | select(.name | startswith($prefix)) | "\(.last_updated)|\(.name)"')
-
-    if [ -n "$tags" ]; then
-      all_tags="$all_tags$tags"$'\n'
-    fi
-    page=$((page + 1))
-  done
-
-  echo "$all_tags" | sort -r | cut -d'|' -f2
-}
-
-delete_tag() {
-  local tag_name="$1"
-  echo "Deleting tag: $tag_name"
-
-  local delete_url="https://hub.docker.com/v2/repositories/${REPO}/tags/$tag_name"
-  set +x
-  local response http_code body
-  response=$(curl -s -w "\n%{http_code}" -X DELETE \
-    -H "Authorization: Bearer $BEARER_TOKEN" "$delete_url")
-  set -x
-  http_code=$(printf '%s\n' "$response" | tail -n1)
-  body=$(printf '%s\n' "$response" | sed '$d')
-
-  if [ "$http_code" -ge 200 ] && [ "$http_code" -lt 300 ]; then
-    echo "Successfully deleted tag: $tag_name (HTTP ${http_code})"
-    return 0
-  fi
-
-  local detail=""
-  if echo "$body" | jq -e '.detail' > /dev/null 2>&1; then
-    detail=$(echo "$body" | jq -r '.detail')
-  elif [ -n "$body" ]; then
-    detail="$body"
-  else
-    detail="(empty response body)"
-  fi
-  echo "Error: Failed to delete tag $tag_name (HTTP ${http_code}): ${detail}"
-  return 1
-}
-
-echo "Fetching all tags from DockerHub..."
-all_tags=$(get_all_tags)
-
-if [ -z "$all_tags" ]; then
-  echo "No tags found to clean up"
-  exit 0
-fi
-
-total_tags=$(echo "$all_tags" | wc -l)
-echo "Found $total_tags tags"
-
-tags_to_keep=14
-tags_to_delete=$((total_tags - tags_to_keep))
-
-if [ $tags_to_delete -le 0 ]; then
-  echo "No tags need to be deleted (only $total_tags tags found, keeping $tags_to_keep)"
-  exit 0
-fi
-
-echo "Will delete $tags_to_delete old tags, keeping the newest $tags_to_keep"
-
-tags_to_delete_list=$(echo "$all_tags" | tail -n +$((tags_to_keep + 1)))
-
-if [ -z "$tags_to_delete_list" ]; then
-  echo "No tags to delete"
-  exit 0
-fi
-
-echo "Deleting old tags..."
-delete_failures=0
-while IFS= read -r tag; do
-  if [ -n "$tag" ]; then
-    if ! delete_tag "$tag"; then
-      delete_failures=$((delete_failures + 1))
-    fi
-    sleep 1
-  fi
-done <<< "$tags_to_delete_list"
-
-if [ "$delete_failures" -gt 0 ]; then
-  echo "Cleanup finished with ${delete_failures} deletion failure(s)"
-  exit 1
-fi
-
-echo "Cleanup completed successfully"
@@ -1,87 +1,50 @@
 #!/bin/bash
 # SPDX-License-Identifier: Apache-2.0
 #
-# Publish Docker images from ECR staging to DockerHub.
-#
-# Usage:
-#   publish-release-images.sh            # release mode (default)
-#   publish-release-images.sh release
-#   publish-release-images.sh nightly
-#
-# Release tags: latest, v<version>
-# Nightly tags: nightly, nightly-<commit>
+# Publish release Docker images from ECR to DockerHub.
+# Pulls per-arch images, tags with `latest` and versioned tags, pushes them,
+# then creates and pushes a multi-arch manifest.

 set -euo pipefail

-MODE="${1:-release}"
+RELEASE_VERSION=$(buildkite-agent meta-data get release-version --default "" | sed 's/^v//')
+if [ -z "${RELEASE_VERSION}" ]; then
+  echo "ERROR: release-version metadata not set"
+  exit 1
+fi

+COMMIT="$BUILDKITE_COMMIT"
 DOCKERHUB_REPO="vllm/vllm-omni"
 ECR_REPO="public.ecr.aws/q9t5s3a7/vllm-omni-release-repo"
-COMMIT="$BUILDKITE_COMMIT"
-PRIMARY_TAGS=()
-EXTRA_MANIFEST_TAGS=()
-
-case "${MODE}" in
-  release)
-    RELEASE_VERSION=$(buildkite-agent meta-data get release-version --default "" | sed 's/^v//')
-    if [ -z "${RELEASE_VERSION}" ]; then
-      echo "ERROR: release-version metadata not set"
-      exit 1
-    fi
-    PRIMARY_TAGS=("latest" "v${RELEASE_VERSION}")
-    ;;
-  nightly)
-    # Commit-pinned manifest reuses nightly-{x86_64,aarch64} arch images.
-    PRIMARY_TAGS=("nightly")
-    EXTRA_MANIFEST_TAGS=("nightly-${COMMIT}")
-    ;;
-  *)
-    echo "Usage: $0 {release|nightly}"
-    exit 2
-    ;;
-esac

 echo "========================================"
-echo "Publishing ${MODE} images to ${DOCKERHUB_REPO}"
+echo "Publishing release images v${RELEASE_VERSION}"
 echo "  Commit: ${COMMIT}"
-echo "  Primary tags: ${PRIMARY_TAGS[*]}"
-if [ ${#EXTRA_MANIFEST_TAGS[@]} -gt 0 ]; then
-  echo "  Extra manifests: ${EXTRA_MANIFEST_TAGS[*]}"
-fi
 echo "========================================"

+# Login to ECR to pull staging images
 aws ecr-public get-login-password --region us-east-1 | \
  docker login --username AWS --password-stdin public.ecr.aws/q9t5s3a7

-SRC_X86="${ECR_REPO}:${COMMIT}-x86_64"
-SRC_ARM="${ECR_REPO}:${COMMIT}-aarch64"
+docker pull "${ECR_REPO}:${COMMIT}-x86_64"
+docker pull "${ECR_REPO}:${COMMIT}-aarch64"

-docker pull "${SRC_X86}"
-docker pull "${SRC_ARM}"
+docker tag "${ECR_REPO}:${COMMIT}-x86_64" "${DOCKERHUB_REPO}:latest-x86_64"
+docker tag "${ECR_REPO}:${COMMIT}-x86_64" "${DOCKERHUB_REPO}:v${RELEASE_VERSION}-x86_64"
+docker push "${DOCKERHUB_REPO}:latest-x86_64"
+docker push "${DOCKERHUB_REPO}:v${RELEASE_VERSION}-x86_64"

-publish_manifest() {
-  local tag="$1"
-  local arch_tag_base="$2"
-  docker manifest rm "${DOCKERHUB_REPO}:${tag}" || true
-  docker manifest create \
-    "${DOCKERHUB_REPO}:${tag}" \
-    "${DOCKERHUB_REPO}:${arch_tag_base}-x86_64" \
-    "${DOCKERHUB_REPO}:${arch_tag_base}-aarch64"
-  docker manifest push "${DOCKERHUB_REPO}:${tag}"
-}
+docker tag "${ECR_REPO}:${COMMIT}-aarch64" "${DOCKERHUB_REPO}:latest-aarch64"
+docker tag "${ECR_REPO}:${COMMIT}-aarch64" "${DOCKERHUB_REPO}:v${RELEASE_VERSION}-aarch64"
+docker push "${DOCKERHUB_REPO}:latest-aarch64"
+docker push "${DOCKERHUB_REPO}:v${RELEASE_VERSION}-aarch64"

-for tag in "${PRIMARY_TAGS[@]}"; do
-  docker tag "${SRC_X86}" "${DOCKERHUB_REPO}:${tag}-x86_64"
-  docker tag "${SRC_ARM}" "${DOCKERHUB_REPO}:${tag}-aarch64"
-  docker push "${DOCKERHUB_REPO}:${tag}-x86_64"
-  docker push "${DOCKERHUB_REPO}:${tag}-aarch64"
-  publish_manifest "${tag}" "${tag}"
-done
-
-ARCH_BASE="${PRIMARY_TAGS[0]}"
-for tag in "${EXTRA_MANIFEST_TAGS[@]}"; do
-  publish_manifest "${tag}" "${ARCH_BASE}"
-done
+docker manifest rm "${DOCKERHUB_REPO}:latest" || true
+docker manifest rm "${DOCKERHUB_REPO}:v${RELEASE_VERSION}" || true
+docker manifest create "${DOCKERHUB_REPO}:latest" "${DOCKERHUB_REPO}:latest-x86_64" "${DOCKERHUB_REPO}:latest-aarch64"
+docker manifest create "${DOCKERHUB_REPO}:v${RELEASE_VERSION}" "${DOCKERHUB_REPO}:v${RELEASE_VERSION}-x86_64" "${DOCKERHUB_REPO}:v${RELEASE_VERSION}-aarch64"
+docker manifest push "${DOCKERHUB_REPO}:latest"
+docker manifest push "${DOCKERHUB_REPO}:v${RELEASE_VERSION}"

 echo ""
-echo "Successfully published ${MODE} images"
+echo "Successfully published release images for v${RELEASE_VERSION}"
@@ -1,6 +1,6 @@
 ---
 name: precheck-pr
-description: Self-check your branch before creating a PR — catch dead code, prevent new model-specific Python examples, verify accuracy/perf claims, validate PR title format, and confirm merge readiness. Use when the user says "precheck", "self review", "pre-submit check", or "check my PR before I open it." Never posts to GitHub.
+description: Self-check your branch before creating a PR — catch dead code, verify accuracy/perf claims, validate PR title format, and confirm merge readiness. Use when the user says "precheck", "self review", "pre-submit check", or "check my PR before I open it." Never posts to GitHub.
 ---

 # PR Pre-Check
@@ -65,8 +65,6 @@ Ask: "Quick mode or full mode?" Then walk the checklist for the detected PR type

 **Also run the Code-Quality sweep on every PR**, regardless of type or mode: the five diff-scoped checks in [references/code-quality.md](references/code-quality.md) — kwargs fragility, broad-except swallow, `Any`/wrong type hints, hot-path `.clone()`/`deepcopy`, and event-loop blocking — plus the advisory conventions (log level, structured logging, synchronization, cleanup, dependencies, naming) in [checklists.md](references/checklists.md). These count only lines the PR *adds* — the pre-existing backlog across the repo is out of scope.

-**Also run the Examples-Policy check on every PR** using [references/examples-policy.md](references/examples-policy.md). Inspect only Python paths introduced by the diff. Treat a new model-, checkpoint-, vendor-, or family-specific Python example as blocking; do not report pre-existing example debt.
-
 ### Step 5: Print Report

 ```
@@ -79,7 +77,6 @@ Pre-check report for <branch>
  ─────────────────  ──────
  PR title format    ✓
  Code quality       ⚠ 1 broad except, 2 Any hints
-  Examples policy    ✗ new model-specific Python example
  PR desc integrity  ✓
  Registry/config    ✓
  Dead code          ⚠ 2 warnings
@@ -47,19 +47,6 @@ Diff-scoped sweep for five fragility patterns that are pervasive in the existing

 Roll the ⚠/✗ counts into the report as a single **Code quality** dimension row.

---
-
-## All PRs: Examples Policy (run on every PR, quick & full)
-
-Inspect Python files introduced under `examples/` using
-[examples-policy.md](examples-policy.md). This is a diff-scoped ratchet: existing
-model-specific examples may be edited or removed without triggering the check.
-
- [ ] **No new model-specific Python examples:** the diff adds, copies, or renames no Python file whose path or behavior is specific to one model, checkpoint, vendor, or model family. ✗ for any violation. Route inference through a shared task/protocol entrypoint, model request behavior through `vllm_omni/model_extras`, and commands through task docs or `recipes/`.
- [ ] **New generic example code is justified:** any new task-neutral Python file under `examples/` is an actual user-facing entrypoint rather than reusable production logic, a benchmark, an app, a setup tool, or a reproducer. ⚠ when the placement is questionable.
-
-Roll the result into the report as a separate **Examples policy** dimension.
-
 ### Conventions (eyeball — no grep)

 Judgment calls that don't grep cleanly — apply them while reading the diff, not as a mechanical check:
@@ -1,68 +0,0 @@
-# Examples Python Policy
-
-Prevent new model-specific Python examples without forcing cleanup of the
-existing backlog. Run this check on every PR in quick and full modes.
-
-## Scope
-
-Set the merge base as in the main workflow, then list Python paths introduced
-by the PR, including additions, copies, and renames:
-
-```bash
-BASE="$(git merge-base HEAD origin/main)"
-git diff --name-status --diff-filter=ACR --find-renames --find-copies \
-  "${BASE}"...HEAD -- 'examples/**/*.py'
-```
-
-Inspect destination paths for copies and renames. Existing model-specific files
-that are only modified or deleted are grandfathered and must not be reported.
-
-## Blocking classification
-
-Mark ✗ when a newly introduced Python file does any of the following:
-
- Names or scopes a path to one model, checkpoint, vendor, or model family.
- Hard-codes a model identifier, model-specific prompt, request shape, output
-  conversion, or launch configuration behind an otherwise generic filename.
- Duplicates an existing task/protocol runner to demonstrate one model.
- Adds a per-model helper below a generic task hub such as `text_to_speech/`.
-
-Do not infer safety from a generic filename alone. For example, a file named
-`text_to_audio.py` is still model-specific if it only implements one model's
-contract.
-
-## Acceptable additions
-
-A new Python example may pass when it is a genuinely model-neutral,
-user-facing task or protocol entrypoint. It must accept model selection through
-configuration and keep model-specific behavior out of the script.
-
-Use ⚠ when the file is model-neutral but reusable logic appears misplaced under
-`examples/`. Route code by purpose:
-
-| Code purpose | Preferred location |
-|---|---|
-| Model prompt, defaults, request/output adaptation | `vllm_omni/model_extras/` or production model modules |
-| Runnable model command and validation evidence | Task documentation or `recipes/` |
-| UI or interactive application | `apps/` |
-| Benchmark or evaluator | `benchmarks/` |
-| Regression reproducer | `tests/` |
-| Download, conversion, or setup utility | `tools/` |
-
-If a model cannot use an existing shared runner, report the missing generic
-capability. Do not solve the gap by adding a model-specific Python example.
-
-## Report format
-
-Add one row to the pre-check report:
-
-```text
-Examples policy    ✓ no new Python example paths
-Examples policy    ⚠ generic helper belongs in tools/
-Examples policy    ✗ examples/offline_inference/new_model/end2end.py is model-specific
-Examples policy    ✗ examples/offline_inference/x_to_y_model_name.py is model-specific
-```
-
-For a blocker, name the path, the model-specific behavior, and the appropriate
-shared runner or destination. Do not propose deleting unrelated existing
-examples as part of the PR.
@@ -97,7 +97,6 @@ If docs and live code disagree, verify the code/tests and report the drift.
 | [test-quality-evaluation.md](references/checks/test-quality-evaluation.md) | Tests change, are absent for risky code, or may not exercise production behavior. |
 | [tests-docs-checklist.md](references/checks/tests-docs-checklist.md) | Coverage, CI markers, examples, user docs, or PR evidence need review. |
 | [verification.md](references/checks/verification.md) | Hardware, a server, or a runnable affected path is available for active verification. |
-| [examples-policy.md](../precheck-pr/references/examples-policy.md) | The PR adds, copies, or renames Python under `examples/`; apply the canonical policy shared with `precheck-pr`. |

 ### Delivery and reviewer coordination

@@ -153,13 +152,6 @@ contract they protect or use only the applicable evidence checks.
 Apply every category in [general-checks.md](references/process/general-checks.md) before
 lower-priority comments.

-If the diff census contains an added, copied, or renamed Python path under
-`examples/`, read and apply the canonical
-[examples policy](../precheck-pr/references/examples-policy.md). Treat a new
-model-specific Python example as blocking. Do not flag model-specific example
-debt that the PR only modifies or removes, and do not run the rest of the
-author-oriented `precheck-pr` workflow.
-
 For each changed value or behavior, trace:

 ```text
@@ -46,8 +46,6 @@ htmlcov/
 .cache
 nosetests.xml
 coverage.xml
-coverage-*.xml
-coverage-*.xml.gz
 *.cover
 *.py,cover
 .hypothesis/
@@ -11,15 +11,10 @@ build:
    post_checkout:
      - git fetch --unshallow || true
    pre_install:
-      # `pre_install` runs before RTD upgrades pip, and the seeded pip 23.1
-      # rejects the `typing_extensions` wheel torch needs (fixed in pip 23.2).
-      - python -m pip install --upgrade pip
      # Pre-install CPU torch so the subsequent `pip install .[docs]` does not
      # pull ~2 GB of CUDA 13 libs (cuBLAS/cuDNN/NCCL/...) that exceed RTD's
-      # 1 GB memory cap and time out the mkdocs build. Wheel-only: `--index-url`
-      # replaces PyPI, so an sdist fallback cannot reach its build deps. The
-      # quotes keep YAML from reading `:all:` as a mapping key.
-      - "python -m pip install --only-binary=:all: --index-url https://download.pytorch.org/whl/cpu torch"
+      # 1 GB memory cap and time out the mkdocs build.
+      - python -m pip install --index-url https://download.pytorch.org/whl/cpu torch

 mkdocs:
  configuration: mkdocs.yml
@@ -16,7 +16,6 @@ Easy, fast, and cheap omni-modality model serving for everyone
 ---

 *Latest News* 🔥
- [2026/08] [VeRL-Omni](https://github.com/verl-project/verl-omni) `v0.2.0` is released: faster diffusion RL powered by vLLM-Omni (request-level/step-wise batching with FA3), rebuilt Qwen3-Omni multimodal training (DPO & GSPO), plus LTX-2.3, Qwen-Image-Edit support and more. See the [release notes](https://github.com/verl-project/verl-omni/releases/tag/v0.2.0).
 - [2026/08] We released [0.26.0](https://github.com/vllm-project/vllm-omni/releases/tag/v0.26.0) - aligned with the vLLM 0.26 release line, featuring [MiniMax H3](recipes/MiniMaxAI/MiniMax-H3.md) joint video/audio generation, an experimental full-duplex realtime runtime for [MiniCPM-o 4.5](recipes/OpenBMB/MiniCPM-o-4_5.md), distributed layerwise diffusion offload, and broader model, hardware, streaming, TTS, and quantization support.
 - [2026/07] We released [0.24.0](https://github.com/vllm-project/vllm-omni/releases/tag/v0.24.0) - aligned with the vLLM 0.24 release line, expanding production-ready coverage across TTS, speech, diffusion, image/video generation, and robot-policy serving, with major Omni stage runtime refactoring, diffusion request-level batching, async output materialization, quantization/cache/memory improvements, and broad CUDA/ROCm/XPU/NPU support.
 - [2026/06] Starting with [0.14.0](https://github.com/vllm-project/vllm-omni/releases/tag/v0.14.0), vLLM-Omni publishes a stable release aligned with every even-numbered upstream vLLM minor version. [0.16.0](https://github.com/vllm-project/vllm-omni/releases/tag/v0.16.0), [0.18.0](https://github.com/vllm-project/vllm-omni/releases/tag/v0.18.0), [0.20.0](https://github.com/vllm-project/vllm-omni/releases/tag/v0.20.0), and [0.22.0](https://github.com/vllm-project/vllm-omni/releases/tag/v0.22.0) continued this cadence, expanding omni and world-model support with [NVIDIA Cosmos3](recipes/cosmos3/Cosmos3-Nano.md) and DreamZero, adding models such as MiniCPM-o 4.5, MOSS-TTS, and Lance, and advancing TTS, diffusion, distributed execution, quantization, RL integration through [VeRL-Omni](https://github.com/verl-project/verl-omni), and CUDA/ROCm/MUSA/NPU/XPU coverage.
@@ -158,6 +158,7 @@ def _build_omni_kwargs(args, quantization=None):
 def _generate_image(omni, args, prompt, seed):
    """Generate a single image and return (PIL.Image, time_seconds, memory_gib)."""
    from vllm_omni.inputs.data import OmniDiffusionSamplingParams
+    from vllm_omni.outputs import OmniRequestOutput
    from vllm_omni.platforms import current_omni_platform

    generator = torch.Generator(device=current_omni_platform.device_type).manual_seed(seed)
@@ -175,7 +176,7 @@ def _generate_image(omni, args, prompt, seed):
    elapsed = time.perf_counter() - start
    peak_mem = torch.accelerator.max_memory_allocated() / (1024**3)

-    req_out = outputs[0] if isinstance(outputs, list) else outputs
+    req_out = OmniRequestOutput.unwrap_result(outputs)
    if not req_out.images:
        raise ValueError("Could not extract image output from result.")
    img = req_out.images[0]
@@ -205,15 +206,15 @@ def _generate_video(omni, args, prompt, seed):
    elapsed = time.perf_counter() - start
    peak_mem = torch.accelerator.max_memory_allocated() / (1024**3)

-    if isinstance(outputs, list) and isinstance(outputs[0], OmniRequestOutput):
-        first = outputs[0]
-    elif isinstance(outputs, OmniRequestOutput):
-        first = outputs
-    else:
-        raise ValueError("Could not extract video frames from output.")
-
-    if hasattr(first, "images"):
-        frames = first.images[0] if first.images else None
+    first = outputs[0]
+    if hasattr(first, "request_output") and isinstance(first.request_output, list):
+        inner = first.request_output[0]
+        if isinstance(inner, OmniRequestOutput) and hasattr(inner, "images"):
+            frames = inner.images[0] if inner.images else None
+        else:
+            frames = inner
+    elif hasattr(first, "images") and first.images:
+        frames = first.images[0]
    else:
        raise ValueError("Could not extract video frames from output.")

@@ -300,7 +300,7 @@ def benchmark(args: argparse.Namespace) -> None:
        output_idx = 0
        for stage_outputs in omni.generate(all_prompts, sampling_params_list, py_generator=True):
            if stage_outputs.final_output_type == "image":
-                request_output = stage_outputs
+                request_output = stage_outputs.request_output
                request_id = getattr(request_output, "request_id", "")

                images = getattr(request_output, "images", [])
@@ -167,11 +167,9 @@ def main() -> None:
    ]
    native_cmd = [
        sys.executable,
-        "examples/offline_inference/text_to_video/text_to_video.py",
+        "examples/offline_inference/text_to_video/text_to_video_lingbot.py",
        "--model",
        args.model,
-        "--model-class-name",
-        "LingBotVideoPipeline",
        "--prompt",
        args.prompt,
        "--output",
@@ -1,5 +1,5 @@
 ARG VLLM_ASCEND_IMAGE=quay.io/atlas-ci/vllm-ascend
-ARG VLLM_ASCEND_TAG=v0.27.0
+ARG VLLM_ASCEND_TAG=v0.26.0
 FROM ${VLLM_ASCEND_IMAGE}:${VLLM_ASCEND_TAG}

 # WORKDIR /vllm-workspace/vllm
@@ -1,5 +1,5 @@
 ARG VLLM_ASCEND_IMAGE=quay.io/atlas-ci/vllm-ascend
-ARG VLLM_ASCEND_TAG=v0.27.0-a3
+ARG VLLM_ASCEND_TAG=v0.26.0-a3
 FROM ${VLLM_ASCEND_IMAGE}:${VLLM_ASCEND_TAG}

 # WORKDIR /vllm-workspace/vllm
@@ -1,5 +1,5 @@
 ARG VLLM_ASCEND_IMAGE=quay.io/atlas-ci/vllm-ascend
-ARG VLLM_ASCEND_TAG=v0.27.0
+ARG VLLM_ASCEND_TAG=v0.26.0
 FROM ${VLLM_ASCEND_IMAGE}:${VLLM_ASCEND_TAG}

 ARG APP_DIR=/vllm-workspace/vllm-omni
@@ -1,5 +1,5 @@
 ARG VLLM_ASCEND_IMAGE=quay.io/atlas-ci/vllm-ascend
-ARG VLLM_ASCEND_TAG=v0.27.0-a3
+ARG VLLM_ASCEND_TAG=v0.26.0-a3
 FROM ${VLLM_ASCEND_IMAGE}:${VLLM_ASCEND_TAG}

 ARG APP_DIR=/vllm-workspace/vllm-omni
@@ -1,4 +1,4 @@
-ARG BASE_IMAGE=vllm/vllm-openai-rocm:v0.27.0
+ARG BASE_IMAGE=vllm/vllm-openai-rocm:v0.26.0
 FROM ${BASE_IMAGE} AS base

 # Declare a variable to know if we want to use the nightly build or the stable build.
@@ -10,7 +10,7 @@ FROM ${BASE_IMAGE} AS base
 #    we should swap over to use stable release ASAP.
 #    We should avoid relying on custom commits.
 ARG USE_NIGHTLY_BUILD=0
-ARG VLLM_VERSION_OR_COMMIT_HASH=v0.27.0
+ARG VLLM_VERSION_OR_COMMIT_HASH=v0.26.0
 ARG ARG_PYTORCH_ROCM_ARCH
 ENV PYTORCH_ROCM_ARCH=${ARG_PYTORCH_ROCM_ARCH:-${PYTORCH_ROCM_ARCH}}

@@ -79,16 +79,9 @@ RUN printf '%s\n' \
    '    os._exit(_exit_code)' \
    > ${COMMON_WORKDIR}/vllm-omni/conftest.py

-# Some optional dependencies pull in the CPU ONNX Runtime distribution. The
-# CPU and ROCm wheels own the same import path and cannot coexist, so remove
-# the CPU wheel and reinstall the ROCm wheel after dependency resolution.
 RUN cd ${COMMON_WORKDIR}/vllm-omni && \
    uv pip install --python "$(python3 -c 'import sys; print(sys.executable)')" \
        --no-cache-dir ".[dev]" --no-build-isolation && \
-    python3 -m pip uninstall -y onnxruntime && \
-    python3 -m pip install --no-cache-dir --force-reinstall --no-deps \
-        "onnxruntime-rocm>=1.22.2" && \
-    python3 -c "import importlib.metadata as m; import onnxruntime as ort; assert 'ROCMExecutionProvider' in ort.get_available_providers(), ort.get_available_providers(); assert m.version('onnxruntime-rocm'); assert not any(d.metadata['Name'] == 'onnxruntime' for d in m.distributions())" && \
    python3 -c "from torchcodec.decoders import VideoDecoder"

 RUN ln -sf /usr/bin/python3 /usr/bin/python
@@ -60,11 +60,7 @@ nav:
      - Overview and Compatibility:
        - Overview: user_guide/diffusion_features.md
        - Feature Compatibility: user_guide/feature_compatibility.md
-      - CPU Offloading:
-        - Overview: user_guide/diffusion/cpu_offload.md
-        - Model-Level: user_guide/diffusion/offloader/cpu_offload.md
-        - Layerwise: user_guide/diffusion/offloader/layerwise_offload.md
-        - Distributed Layerwise: user_guide/diffusion/offloader/distributed_layerwise_offload.md
+      - CPU Offloading: user_guide/diffusion/cpu_offload.md
      - Cache Acceleration:
        - TeaCache: user_guide/diffusion/cache_acceleration/teacache.md
        - Cache-DiT: user_guide/diffusion/cache_acceleration/cache_dit.md
@@ -76,13 +72,7 @@ nav:
        - Sequence Parallel: user_guide/diffusion/parallelism/sequence_parallel.md
        - Tensor Parallel: user_guide/diffusion/parallelism/tensor_parallel.md
        - VAE Parallelism: user_guide/diffusion/parallelism/vae_parallelism.md
-      - Attention Backends:
-        - Overview: user_guide/diffusion/attention_backends.md
-        - Dense Backends: user_guide/diffusion/attention_backends/dense_backends.md
-        - TRTLLM: user_guide/diffusion/attention_backends/trtllm.md
-        - SageAttention: user_guide/diffusion/attention_backends/sage.md
-        - Hugging Face Hub: user_guide/diffusion/attention_backends/huggingface_hub.md
-        - RainFusion: user_guide/diffusion/attention_backends/rainfusion.md
+      - Attention Backends: user_guide/diffusion/attention_backends.md
      - Regional Compilation: user_guide/diffusion/regional_compilation.md
      - Frame Interpolation: user_guide/diffusion/frame_interpolation.md
      - Startup and Loading: user_guide/diffusion/startup_and_loading.md
@@ -135,16 +125,11 @@ nav:
          - Tensor Parallel: design/feature/tensor_parallel.md
          - VAE Patch Parallelism: design/feature/vae_parallel.md
        - Attention Optimization:
-          - Backend Selection: design/feature/attention_backend_selection.md
          - Skip-Softmax: design/feature/skip_softmax.md
-        - CPU Offloading:
-          - Overview: design/feature/offloader/README.md
-          - Model-Level: design/feature/offloader/cpu_offload.md
-          - Layerwise: design/feature/offloader/layerwise_offload.md
-          - Distributed Layerwise: design/feature/offloader/distributed_layerwise_offload.md
        - Cache-DiT: design/feature/cache_dit.md
        - TeaCache: design/feature/teacache.md
        - Diffusion Continuous Batching: design/feature/diffusion_continuous_batching.md
+        - Distributed Layerwise Offload: design/feature/distributed_layerwise_offload.md
    - Infrastructure and Performance:
      - Prometheus Metrics: design/metrics.md
      - Speech Generation Performance Optimizations: design/qwen3_omni_tts_performance_optimization.md
@@ -178,8 +163,7 @@ nav:
 - CLI Reference: cli
 - Community:
  - Governance: community/governance.md
-  - Contact Us: community/contact_us.md
-  - Community Meetings: community/meetings.md
+  - community/*
  - Slack: https://slack.vllm.ai
  - Blog: https://blog.vllm.ai
  - Forum: https://discuss.vllm.ai
@@ -1,9 +1,5 @@
 # Contact Us

- For bugs and feature requests, search or open a GitHub [issue](https://github.com/vllm-project/vllm-omni/issues).
- For technical and usage questions, join the `sig-omni` channel in [vLLM Slack](https://slack.vllm.ai/) or use the [vLLM Forum](https://discuss.vllm.ai/).
- For coordinating contributions and development, use `sig-omni`, the forum, or join a [community meeting](meetings.md).
-
-## Security Disclosures
-
-Do not share vulnerability details in public GitHub issues, pull requests, discussions, or Slack channels. To arrange a private report, send a direct message to one of the [lead maintainers](governance.md#lead-maintainers) in [vLLM Slack](https://slack.vllm.ai/). If you cannot send a direct message, you may post a detail-free request in `sig-omni` asking a lead maintainer to contact you privately; do not include any vulnerability details in that request.
+- For technical questions and feature requests, please use GitHub [Issues](https://github.com/vllm-project/vllm-omni/issues)
+- For coordinating contributions and development and discussing with other users and developers, please join `sig-omni` channel in our [Slack](https://slack.vllm.ai/) or use the [vLLM Forum](https://discuss.vllm.ai/)
+- For security disclosures, please use GitHub's [Security Advisories](https://github.com/vllm-project/vllm-omni/security/advisories) feature
@@ -52,11 +52,31 @@ Committers have write access and merge rights. They typically have deep expertis
 - [@ZJY0516](https://github.com/ZJY0516): Diffusion attention backend, kernel fusion, and CustomOp
 - [@yuanheng-zhao](https://github.com/yuanheng-zhao): Diffusion cache, offload, and Omni Support

-## Reviewer Routing
+## Diffusion Workload Division

-For path-based reviewer routing, consult [`.github/CODEOWNERS`](https://github.com/vllm-project/vllm-omni/blob/main/.github/CODEOWNERS). Detailed subsystem boundaries and safe-change guidance live in the [module design documents](../design/index.md#module-design-documents).
+This section breaks down diffusion-related responsibilities. If you have PRs touching these areas, please ping the listed owners for review.

-`CODEOWNERS` is operational routing metadata, not a governance or approval policy. Being listed does not grant committer status or merge rights, and it does not mean every listed reviewer must approve a change. The maintainer roster above is authoritative for project roles and merge rights.
+### Runtime-related
+
+- Diffusion models: @RuixiangMa, @wtomin, @xuechendi
+
+### Optimization
+
+- Parallel: @RuixiangMa, @wtomin
+- Attention backend: @ZJY0516
+- Cache: @yuanheng-zhao, @RuixiangMa, @SamitHuang
+- Offload: @yuanheng-zhao
+- Intel GPU support: @xuechendi
+- Quantization: @lishunyang12, @david6666666
+- Kernel fusion / communication-computation: @ZJY0516
+
+### Docs & Test
+
+- Diffusion docs: @RuixiangMa, @wtomin
+
+## Meetings
+
+Committers hold **bi-weekly meetings** to discuss future directions and collaborations of the project.

 ## Committer Nomination Process

@@ -1,8 +0,0 @@
-# Community Meetings
-
-vLLM-Omni hosts developer-facing meetings for Chinese- and English-language audiences. Schedules and access details can change, so use these maintained documents as the source of truth:
-
- [Chinese-language meeting document](https://docs.google.com/document/d/1pdUBiS_7mdOUNDtdwy-9OUf7jsMWN324BIbps5olDME/edit?tab=t.0)
- [English-language meeting document](https://docs.google.com/document/d/19AlD08T8uJ7wqfs8VtYCi0iGMTwlTYVVlAxFZ3S7OIg/edit?tab=t.0)
-
-Each document contains the current schedule, access details, agendas, and past meeting notes. For broader vLLM community events, see the [vLLM events calendar](https://vllm.ai/events/).
@@ -0,0 +1 @@
+# Meetups
@@ -0,0 +1,12 @@
+# Volunteers for Bugfix and CI
+
+We encourage you to check current docs and [issues](https://github.com/vllm-project/vllm-omni/issues) to find possible solutions for your questions. If non of these can solve it, please propose an issue to describe your questions about bug or CI problems for developing.
+
+If you have urgent need for locating and solving bugfix or CI problems, please find community volunteers below.
+
+| Dec 4-Dec 12 | Dec 15-Dec 19 | Dec 22-Dec 26 | Dec 29- Jan 2, 2026| Jan 5-Jan 9 | Jan 12-Jan 16 |
+|----------|----------|----------|----------|----------|----------|
+| <a href="https://github.com/congw729">Conw729</a> | <a href="https://github.com/yinpeiqi">yinpeiqi</a> | <a href="https://github.com/tzhouam">tzhouam</a> | <a href="https://github.com/SamitHuang">SamitHuang</a> | <a href="https://github.com/gcanlin">gcanlin</a> | <a href="https://github.com/natureofnature">natureofnature</a> |
+| <a href="https://github.com/david6666666">david6666666</a> | <a href="https://github.com/R2-Y">R2-Y</a> | <a href="https://github.com/hsliuustc0106">hsliuustc0106</a> | <a href="https://github.com/Gaohan123">Gaohan123</a> | <a href="https://github.com/ZJY0516">ZJY0516</a> | <a href="https://github.com/qibaoyuan">qibaoyuan</a> |
+
+We kindly welcome more contributors to fix bugs and contribute new features!
@@ -3,7 +3,7 @@
 Thank you for your interest in contributing to vLLM-Omni! This document provides guidelines and instructions for contributing.

 !!! note
-    vLLM-Omni hosts developer-facing meetings for Chinese- and English-language audiences. See [Community Meetings](../community/meetings.md) for current schedules, access details, agendas, and past notes.
+    We host weekly developer-facing online meetings to discuss milestones and updates **every Tuesday at 19:30 PDT**. Meeting link as well as the past meeting notes can be found [here](https://tinyurl.com/vllm-omni-meeting).

 ## Getting Started

@@ -122,7 +122,7 @@ Repository skills guide the agent, but they do not replace contributor judgment,
 If you encounter a bug or have a feature request, please search existing issues first to see if it has already been reported. If not, please file a new issue, providing as much relevant information as possible.

 !!! important
-    Do not report suspected security vulnerabilities through a public issue, pull request, discussion, or Slack channel. Follow the [security disclosure instructions](../community/contact_us.md#security-disclosures) to arrange a private report.
+    If you discover a security vulnerability, please report it by creating a GitHub issue with the `security` label.

 ## Pull Requests & Code Reviews

@@ -327,96 +327,6 @@ On PR builds, `upload_pipeline.py` logs `skip '…' (no changes under …)` for
 - Use **groups** for dashboard readability; keep **E2E Test** as the group name CUDA diff filtering expects for `--e2e` nightly runs on main.
 - Prefix labels by model domain: **Omni ·**, **TTS ·**, **Diffusion ·**, **Simple ·**, etc., matching existing steps.

-### Per-model coverage
-
-Pilot (v1): two Merge-tier (L3) jobs in `.buildkite/cuda/test-merge.yml` upload
-per-model, per-entry-mode coverage as Buildkite artifacts — "Diffusion · Bagel
-Test" and "TTS · Qwen3-TTS Base Test". Both run on a single GPU so the pilot is
-cheap to reproduce. This is a pilot, not a rollout: no dashboard/visualization
-lives in this repo, and nothing is gated on coverage.
-
-**Naming convention**: `coverage-<model_id>-<mode>-<step_id>.xml.gz`, where
-`<model_id>` is the model's directory name under
-`vllm_omni/diffusion/models/<model_id>/` or
-`vllm_omni/model_executor/models/<model_id>/` (e.g. `z_image`, `qwen3_omni`),
-`<mode>` is `online` or `offline`, and `<step_id>` is `BUILDKITE_STEP_ID`
-(`local` outside Buildkite). `gunzip` before feeding a report to a Cobertura
-consumer.
-
-Reports are gzipped because `--cov=vllm_omni` sets coverage's `source`, which
-makes it walk the package and emit one `<line>` element per statement for every
-file — including the ones a single model's tests never import. That inventory,
-not the coverage, is the size: a Bagel report is 7.1 MB, of which 96.5% is
-`<line>` elements and 77% belongs to the 840 of 1169 files that run never
-imported. A run covering zero lines produces the same 7 MB. gzip takes it to
-roughly 410 KB and changes nothing about the data.
-
-`<step_id>` is what keeps two steps that cover the same model apart. Artifacts are
-scoped to the build, and a nightly build carries the ready, merge and nightly tiers
-at once, so several same-model steps land in one namespace — `qwen3_tts` already has
-both a Base and a CustomVoice job, and `minicpmo_4_5` a base and a duplex one. Two
-uploads on one path do not fail loudly: an exact-name download can report the path
-as ambiguous, and a glob download fetches every match concurrently and renames each
-onto the same destination, so whichever finishes last wins. The step id remains the
-logical step identifier across retries, while Buildkite's default artifact lookup
-selects only the latest attempt — `BUILDKITE_JOB_ID` would instead give every
-attempt its own filename, leaving a failed attempt's partial report to be picked up
-alongside the real one. A step using `parallelism`/matrix would need
-`BUILDKITE_PARALLEL_JOB` added, since its jobs share a step id; neither pilot is
-one.
-
-**Opting in a new model**: replace the job's combined `pytest` command with
-[`run_cov_split.sh`](https://github.com/vllm-project/vllm-omni/blob/main/.buildkite/common/scripts/run_cov_split.sh),
-which runs each mode, names the reports, uploads them, and fails the step if
-either half or the upload failed:
-
-```yaml
-commands:
-  - |
-    .buildkite/common/scripts/run_cov_split.sh \
-      --model-id <model_id> \
-      --offline <offline test path> \
-      --online <online test path> \
-      -- <the job's existing pytest flags, e.g. -m '...' --run-level '...'>
-```
-
-Everything after `--` is forwarded verbatim to both runs with quoting preserved,
-so an expression like `-m 'advanced_model and cuda'` survives intact and a job can
-pass anything else it needs. `--offline`/`--online` are repeatable and only one is
-required, so a job with tests in a single mode runs just that half. Runtime is
-bounded solely by the step's `timeout_in_minutes` — raise it, since the split
-loads the model once per mode.
-
-Before splitting, confirm each half actually collects at least one test under the job's forwarded filters — pytest exits with code 5 ("no tests collected") if a half is empty, which the script reports as a failure, red-ing a job that used to pass as one combined invocation.
-
-Also check the tests' `num_cards` against the job's `mirror_hardwares` preset.
-`cuda_marks` turns `num_cards > 1` into `skipif(device_count() < num_cards)`, so a
-test asking for more GPUs than the preset provides is silently skipped and its
-coverage artifact comes back empty. Splitting such a job produces a file that
-looks fine and measures nothing — "Diffusion · Z Image Test" is the current
-example (online tests want 4 cards, the job runs on `l4_1`), which is why it is
-not a coverage pilot.
-
-Online-mode coverage depends on the `[tool.coverage.run]` `patch`/`sigterm`
-settings in `pyproject.toml`: online tests launch the server with
-`subprocess.Popen` and stop it with SIGTERM, and without those settings the XML
-reflects only the pytest parent process, not the server's code paths.
-
-The upload depends on `buildkite-agent` being callable inside the container. The
-`kubernetes` presets (`h100_*`, `*_npu_*`) provide it; the `docker` ones (`l4_*`)
-only do because they set `mount-buildkite-agent: true`. A new docker preset that
-runs a coverage job needs the same.
-
-List both `run_cov_split.sh` and `pyproject.toml` in every opted-in job's
-`source_file_dependencies` — both change what the job measures, so without them a
-change there is filtered out of normal PR builds and only surfaces in a later
-nightly. `tests/buildkite/test_upload_pipeline.py` asserts this for the pilots.
-Editing only the surrounding CI YAML still does not schedule them, so a PR that
-touches just the wiring needs a full E2E run (or the commands run on a GPU host)
-to produce artifacts. When checking a new model's
-artifacts, compare `lines-covered` between the online and offline XML rather than
-just confirming both files exist.
-
 ### Validation checklist

 | Check | Command / location |
@@ -406,7 +406,7 @@ the source for configuration, compatibility, and implementation details.
  stage contract.
 * **Quantization and memory efficiency:** [Quantization](feature/quantization.md)
  resolves per-pipeline or per-component quantization configurations, while
-  [Distributed Layerwise Offload](feature/offloader/distributed_layerwise_offload.md)
+  [Distributed Layerwise Offload](feature/distributed_layerwise_offload.md)
  streams diffusion blocks from host memory within the existing parallel
  topology.

@@ -1,89 +0,0 @@
-# Diffusion Attention Backend Selection
-
-This document defines the selection and extension contract for diffusion
-attention backends. User-facing backend choices, installation, and tuning are
-in the [attention backend guides](../../user_guide/diffusion/attention_backends.md).
-
-## Scope
-
-The contract applies to DiT and other diffusion attention layers. It is
-separate from vLLM's autoregressive attention selector.
-
-The selection path has four responsibilities:
-
-1. normalize user configuration into `AttentionConfig` and `AttentionSpec`;
-2. resolve a spec for an attention role;
-3. ask the active platform to validate an explicit backend or choose a
-   hardware default; and
-4. load the selected `AttentionBackend` class from the registry path.
-
-## Resolution contract
-
-`get_attn_backend_for_role()` resolves configuration in this order:
-
-1. exact `per_role[role]`;
-2. category `per_role[role_category]`;
-3. `default`;
-4. platform default.
-
-An explicit resolution returns both the backend class and its
-`AttentionSpec`. A platform-default resolution returns the class and `None`.
-Layers must therefore treat the spec as optional and must not infer that a
-missing spec means SDPA.
-
-Class resolution is cached by backend name, head size, and whether TRTLLM may
-be selected automatically. Logging is cached separately by role and source so
-the startup record identifies why each role received its backend.
-
-## Registry and platform boundary
-
-`DiffusionAttentionBackendEnum` maps stable configuration names to default
-qualified class paths. `register_diffusion_backend()` may replace a path at
-runtime without changing the public enum value.
-
-The active `OmniPlatform` owns compatibility policy through
-`get_diffusion_attn_backend_cls()`. It must:
-
- validate explicit selections and fail with an actionable error when the
-  requested kernel cannot run;
- choose only an available, compatible default when no backend is explicit;
- account for head size and other platform-visible constraints; and
- return a qualified class path implementing `AttentionBackend`.
-
-The selector must not duplicate device capability or package-availability
-policy that belongs to the platform.
-
-## Typed backend options
-
-Backend-specific settings remain typed fields on `AttentionSpec` rather than
-unstructured keyword dictionaries:
-
- `quant` is consumed by FlashInfer and TRTLLM with backend-specific value
-  validation;
- `skip_softmax` is consumed by TRTLLM; and
- `block_sparse` is consumed by block-sparse backends such as RainFusion.
-
-A backend reads only the fields it owns and rejects incompatible values. New
-options should be added to a shared typed spec only when more than one backend
-shares their semantics; otherwise add a dedicated typed block.
-
-## Model integration contract
-
-Each diffusion attention call declares a stable role and, when appropriate, a
-broader category. Model-specific roles permit precise overrides; categories
-preserve common `self` or `cross` policies. A model also decides whether its
-path is compatible with automatic TRTLLM selection, because only the model
-knows whether masking and packing satisfy the kernel contract.
-
-## Adding or changing a backend
-
-An implementation change is complete only when it:
-
-1. implements the `AttentionBackend` interface and exposes a stable enum name;
-2. adds platform validation and default routing where appropriate;
-3. defines and validates any typed configuration;
-4. tests explicit selection, default selection, and incompatible paths;
-5. documents installation, fallback behavior, and quality implications in the
-   corresponding user guide; and
-6. updates the overview matrix without moving algorithm details back into the
-   landing page.
@@ -7,7 +7,7 @@ either shard those host-side weights across an existing parallel group or keep
 the standard loader's rank-local weights and avoid an additional collective.

 For user-facing commands, see the
-[distributed layerwise offloading guide](../../../user_guide/diffusion/offloader/distributed_layerwise_offload.md)
+[distributed layerwise offloading guide](../../user_guide/diffusion/cpu_offload.md)
 and the [Cosmos3 recipe](https://github.com/vllm-project/vllm-omni/blob/main/recipes/cosmos3/Cosmos3-DistOffload.md).

 ## Status
@@ -56,7 +56,7 @@ AllGather:                [full N+1]             [full N+2]
 Buffers:    [current slot]       [prefetch slot]       [current slot]
 ```

-![DLO double-buffer prefetch pipeline](../../figures/dlo/dlo_pipeline.gif)
+![DLO double-buffer prefetch pipeline](../figures/dlo/dlo_pipeline.gif)

 The backend uses two shared device buffers, so accelerator weight residency is
 bounded by the largest streamed blocks rather than the complete model.
@@ -1,80 +0,0 @@
-# CPU Offloading
-
-This document defines the shared architecture for diffusion CPU offloading.
-The three strategies have separate user and design pages:
-
-| Strategy | User guide | Design contract |
-| --- | --- | --- |
-| Model-level | [Guide](../../../user_guide/diffusion/offloader/cpu_offload.md) | [Design](cpu_offload.md) |
-| Layerwise | [Guide](../../../user_guide/diffusion/offloader/layerwise_offload.md) | [Design](layerwise_offload.md) |
-| Distributed layerwise | [Guide](../../../user_guide/diffusion/offloader/distributed_layerwise_offload.md) | [Design](distributed_layerwise_offload.md) |
-
-## Strategy selection
-
-`OffloadConfig.from_od_config()` converts diffusion configuration into one
-`OffloadStrategy`. If callers set multiple flags, selection is deterministic:
-
-1. `DISTRIBUTED_LAYERWISE`;
-2. `LAYERWISE`;
-3. `MODEL_LEVEL`; and
-4. `NONE`.
-
-The factory logs when a higher-priority strategy disables another. It derives
-parallel and HSDP state from `DiffusionParallelConfig`; callers do not provide
-a separate offload group size.
-
-`get_offload_backend()` then validates platform offload support, resolves the
-device, and creates exactly one backend. Returning `None` means offloading is
-disabled or unsupported and must not leave partially installed hooks.
-
-## Shared lifecycle
-
-Every backend implements `OffloadBackend`:
-
- `enable(pipeline)` discovers modules, establishes initial residency, and
-  installs hooks;
- `disable()` removes owned hooks and resources; and
- `is_enabled()` reports lifecycle state.
-
-`disable()` does not promise to restore the pipeline's original device
-placement. The caller owns any subsequent rematerialization.
-
-Hooks are registered through `HookRegistry` and `ModelHook`; offload backends
-must use distinct hook names and remove only hooks they own.
-
-## Discovery and topology
-
-Pipeline component discovery prefers `SupportsComponentDiscovery` declarations:
-
- `_dit_modules`;
- `_encoder_modules`;
- `_vae_modules`; and
- `_resident_modules`.
-
-Dotted paths are supported. Legacy pipelines may use the fallback scan of
-well-known attribute names, but new integrations should declare components
-explicitly.
-
-Ordinary layerwise offload obtains topology from declared
-`_layerwise_offload_blocks_attrs` (with a deprecated singular-name
-compatibility path). Distributed layerwise offload may instead use a pipeline
-`OffloadPlan`, then falls back to declared block attributes and its documented
-compatibility discovery. Discovery metadata describes structure only; the
-backend remains responsible for transfer, synchronization, and storage
-ownership.
-
-## Cross-strategy invariants
-
- At most one strategy owns offload hooks for a pipeline.
- A parameter has one authoritative host representation while offloaded.
- Device storage is not freed until dependent compute or transfer work is
-  complete.
- Non-persistent and model-specific buffers remain correct after movement or
-  checkpoint rematerialization.
- Unsupported parallel or loading combinations fail before hooks mutate the
-  model.
- Platform streams, events, synchronization, and cache management go through
-  the vLLM-Omni platform abstraction.
-
-The diffusion [Offloader module design](../../module/diffusion/offloader.md)
-describes how these feature contracts fit into the larger diffusion runtime.
@@ -1,56 +0,0 @@
-# Model-Level Offload
-
-Model-level offload enforces mutual exclusion between pipeline component
-groups. For commands and model support, see the
-[model-level user guide](../../../user_guide/diffusion/offloader/cpu_offload.md).
-
-## Generic hook path
-
-`ModelLevelOffloadBackend.enable()` discovers DiTs, encoders, and VAEs. It
-makes encoders and VAEs device resident for initialization, then installs
-`SequentialOffloadHook` instances:
-
- each DiT hook offloads all encoders and other DiTs before loading itself;
- each encoder hook offloads every DiT before loading itself; and
- VAEs are not part of the mutual-exclusion hook set.
-
-The hook moves parameters and buffers without recursively calling
-`module.to()`. This avoids recursion through modules that retain references to
-other transformer blocks. Host tensors are pinned when configured; DTensors
-are not pinned through the ordinary tensor path.
-
-Before forward returns control to the model, the hook synchronizes the active
-platform so compute cannot race the transfer. XPU uses blocking device-to-host
-copies because its allocator cannot safely evict storage while an asynchronous
-copy is pending.
-
-## Split-model delegation
-
-If a pipeline provides callable `enable_omni_model_cpu_offload`, the backend
-delegates instead of installing generic encoder/DiT hooks. This supports models
-whose mutually exclusive components are nested inside one transformer, such
-as a reasoner and generator.
-
-The delegated pipeline owns its internal contexts, but must preserve the same
-contract:
-
- only the executing component is device resident;
- enable and disable are idempotent;
- transfers use the supplied device, pinning, and HSDP settings; and
- disabling removes all model-local offload hooks or contexts.
-
-The delegation is currently duck typed. If another independent implementation
-is added, formalize the enable/disable pair as a protocol rather than expanding
-attribute-name heuristics.
-
-## Extension invariants
-
- New ordinary pipelines declare both DiT and encoder groups through
-  `SupportsComponentDiscovery`.
- Models with multiple DiTs offload the inactive DiTs as well as encoders.
- Empty or parameterless modules do not trigger transfers.
- Hook removal does not move modules; callers must not assume original
-  residency is restored.
-
-Shared selection and lifecycle behavior is defined in the
-[CPU Offloading design](README.md).
@@ -1,57 +0,0 @@
-# Layerwise Offload
-
-Layerwise offload streams transformer blocks through one accelerator. For
-commands and model support, see the
-[layerwise user guide](../../../user_guide/diffusion/offloader/layerwise_offload.md).
-
-## Hook ring
-
-`LayerWiseOffloadBackend` discovers every streamable block and registers one
-`LayerwiseOffloadHook` per block. Hooks form a ring: each hook owns the pinned
-host representation of its registered block and a reference to the next block
-it must prefetch; the final hook prefetches the first block for the next
-denoising iteration.
-
-During initialization, parameters and buffers are grouped by dtype and copied
-into contiguous pinned CPU tensors. Original tensor storage is replaced with
-an empty or meta placeholder while identity and module structure are retained.
-Metadata records names, offsets, shapes, and dtypes for rematerialization.
-
-## Forward lifecycle
-
-For each block:
-
-1. the previous hook's completion event ensures this block is materialized;
-2. the copy stream asynchronously allocates and fills the next block's device
-   tensors;
-3. parameter and buffer storage is rebound to views of those tensors;
-4. the current block computes on the normal stream; and
-5. its post-forward hook replaces device storage with placeholders after all
-   dependent work is safe.
-
-The copy stream waits on the compute stream before reusing storage, and the
-compute stream waits on the per-block prefetch event before forward. These
-dependencies, not incidental global synchronization, define correctness.
-
-## Topology contract
-
-A DiT declares ordered block-container attributes using
-`_layerwise_offload_blocks_attrs` or an `OffloadPlan`. Each resolved item must
-be an executable `nn.Module`; ordering must match forward execution. Multiple
-containers are concatenated in execution order.
-
-Non-block DiT modules, encoders, VAEs, and declared resident modules are not
-streamed by this backend.
-
-## Invariants and limitations
-
- Each offloaded tensor has one pinned host backing store.
- Parameter identity is preserved when storage is rebound.
- Blocks with heterogeneous shapes and dtypes use their recorded metadata;
-  implementations must not assume identical blocks.
- The ring is initialized before the first forward so block zero is available.
- This backend is single-device; distributed weight reconstruction belongs to
-  [Distributed Layerwise Offload](distributed_layerwise_offload.md).
-
-Shared selection and lifecycle behavior is defined in the
-[CPU Offloading design](README.md).
@@ -186,7 +186,7 @@ Distributed layerwise offload has an additional boundary: its sharded mmap
 AllGather path is not compatible with online quantization because the path
 expects already materialized checkpoint weights. Use the rank-local
 `--dlo-no-use-allgather` path or a compatible pre-quantized checkpoint when
-combining these features. See the [DLO design document](offloader/distributed_layerwise_offload.md)
+combining these features. See the [DLO design document](distributed_layerwise_offload.md)
 for the full compatibility matrix.

 ## Adding a quantization backend
@@ -2,10 +2,8 @@

 Skip-Softmax is the sparse-attention mode of the `TRTLLM_ATTN` backend. Usage — the config keys
 and how to pick an operating point — is in
-[TRTLLM Attention](../../user_guide/diffusion/attention_backends/trtllm.md#skip-softmax).
-The shared selector contract is documented in
-[Diffusion Attention Backend Selection](attention_backend_selection.md). This
-page explains the algorithm.
+[Diffusion Attention Backends](../../user_guide/diffusion/attention_backends.md). This page explains
+the algorithm.

 ## Motivation

@@ -53,22 +53,15 @@ implementation contract; it is not, by itself, a general support claim.
 #### Attention optimization

 The [Diffusion Attention Backends](../user_guide/diffusion/attention_backends.md)
-guides list selectable backends, platform defaults, installation, and tuning.
-The design contracts separate selection mechanics from backend algorithms:
+guide lists all selectable backends and their platform defaults. Skip-Softmax
+is the backend-related optimization with a standalone feature-design contract:

- [Attention Backend Selection](feature/attention_backend_selection.md)
 - [Skip-Softmax](feature/skip_softmax.md)

-#### CPU offloading
-
- [Overview and Shared Contracts](feature/offloader/README.md)
- [Model-Level Offload](feature/offloader/cpu_offload.md)
- [Layerwise Offload](feature/offloader/layerwise_offload.md)
- [Distributed Layerwise Offload](feature/offloader/distributed_layerwise_offload.md)
-
 - [Cache-DiT](feature/cache_dit.md)
 - [TeaCache](feature/teacache.md)
 - [Diffusion Continuous Batching](feature/diffusion_continuous_batching.md)
+- [Distributed Layerwise Offload](feature/distributed_layerwise_offload.md)

 ## Infrastructure and Performance

@@ -1,6 +1,6 @@
 # Prometheus Metrics Design

-This document describes how vLLM-Omni exposes Prometheus metrics for multi-stage pipelines, the constraints that shaped the design, and how the pipeline-level metrics coexist with upstream vLLM per-engine metrics.
+This document describes how vLLM-Omni exposes Prometheus metrics for multi-stage pipelines, the constraints that shaped the design, and how the pipeline-level metrics coexist with upstream vLLM per-engine metrics. This iteration covers the text and audio surface; diffusion / image / video families land in a follow-up.

 ## Objectives

@@ -48,10 +48,10 @@ defines the shared configuration and backend extension points.
 | Goal | User guide | Related design contract |
 | --- | --- | --- |
 | Compare acceleration methods and supported combinations | [Overview](../user_guide/diffusion_features.md), [Feature Compatibility](../user_guide/feature_compatibility.md) | [Diffusion acceleration designs](../design/index.md#diffusion-acceleration) |
-| Move weights between host and device memory | [CPU Offloading](../user_guide/diffusion/cpu_offload.md) | [CPU Offloading](../design/feature/offloader/README.md) |
+| Move weights between host and device memory | [CPU Offloading](../user_guide/diffusion/cpu_offload.md) | [Distributed Layerwise Offload](../design/feature/distributed_layerwise_offload.md) |
 | Reuse denoising computation | [Cache Acceleration](../user_guide/diffusion/cache_acceleration/cache_dit.md) | [Cache-DiT](../design/feature/cache_dit.md), [TeaCache](../design/feature/teacache.md) |
 | Distribute diffusion work across devices | [Parallelism](../user_guide/diffusion/parallelism/overview.md) | [Parallelism designs](../design/index.md#parallelism) |
-| Select dense, sparse, or quantized attention paths | [Attention Backends](../user_guide/diffusion/attention_backends.md) | [Attention Backend Selection](../design/feature/attention_backend_selection.md) |
+| Select dense, sparse, or quantized attention paths | [Attention Backends](../user_guide/diffusion/attention_backends.md) | [Skip-Softmax](../design/feature/skip_softmax.md) |
 | Compile repeated diffusion regions | [Regional Compilation](../user_guide/diffusion/regional_compilation.md) | User-facing optimization guide |
 | Add generated video frames | [Frame Interpolation](../user_guide/diffusion/frame_interpolation.md) | User-facing extension guide |
 | Reduce diffusion model startup time | [Startup and Loading](../user_guide/diffusion/startup_and_loading.md) | User-facing loading guide |
@@ -42,8 +42,7 @@ th {
 | `Wan22VACEPipeline` | Wan2.1-VACE | `Wan-AI/Wan2.1-VACE-1.3B-diffusers`, `Wan-AI/Wan2.1-VACE-14B-diffusers` | ✅︎ | ✅︎ | ✅︎ | ✅︎ | — |
 | `Wan22VACEPipeline` | Wan2.2-VACE | `Pyros13/Wan2.2-VACE-Fun-A14B-Diffusers` | ✅︎ |   |   |   | — |
 | `LTX2Pipeline` | LTX-2 / LTX-2.3 one-stage T2V and I2V | `Lightricks/LTX-2`, `diffusers/LTX-2.3-Diffusers` | ✅︎ | ✅︎ | | | — |
-| `LTX2TwoStagePipeline` | LTX-2 / LTX-2.3 ordinary two-stage T2V and I2V | `Lightricks/LTX-2`, `diffusers/LTX-2.3-Diffusers` + matching Lightricks LoRA and upsampler | ✅︎ | ✅︎ | | | — |
-| `LTX2DistilledPipeline` | LTX-2 / LTX-2.3 full-distilled two-stage T2V and I2V | `rootonchair/LTX-2-19b-distilled`, `diffusers/LTX-2.3-Distilled-Diffusers` + `Lightricks/LTX-2.3` upsampler | ✅︎ | ✅︎ | | | — |
+| `LTX2DistilledPipeline` | LTX-2 distilled two-stage T2V and I2V | `rootonchair/LTX-2-19b-distilled` | ✅︎ | ✅︎ | | | — |
 | `LingBotVideoPipeline` | LingBot-Video dense and MoE T2I, T2V, TI2V | `robbyant/lingbot-video-dense-1.3b`, `robbyant/lingbot-video-moe-30b-a3b` | ✅︎ | | | | — |
 | `MiniMaxH3Pipeline` | MiniMax H3 T2VA, first/last-keyframe FL2VA, and mixed-reference Ref2VA | `MiniMaxAI/MiniMax-H3` | ✅︎ | ✅︎ | | | [Published](https://recipes.vllm.ai/MiniMaxAI/MiniMax-H3) |
 | `DreamZeroPipeline` | DreamZero-DROID | `GEAR-Dreams/DreamZero-DROID` | ✅︎ | ✅︎ | ✅︎ | ✅︎ | — |
@@ -59,7 +58,6 @@ th {
 | `CosyVoice3Model` | CosyVoice3 | `FunAudioLLM/Fun-CosyVoice3-0.5B-2512` | ✅︎ | ✅︎ | | ✅︎ | — |
 | `OmniVoiceModel` | OmniVoice | `k2-fsa/OmniVoice` | ✅︎ | | | | — |
 | `VoxCPM2TalkerForConditionalGeneration` | VoxCPM2 | `openbmb/VoxCPM2` | ✅︎ | | | | — |
-| `DotsTTSForConditionalGeneration` | dots.tts | `rednote-hilab/dots.tts-soar` | ✅︎ | | | | — |
 | `MammothModa2ForConditionalGeneration` | MammothModa2-Preview | `bytedance-research/MammothModa2-Preview` | ✅︎ | ✅︎ | | | — |
 | `MammothModa2ForConditionalGeneration` | MammothModa2-Dev (AR-only image understanding) | `bytedance-research/MammothModa2-Dev` | ✅︎ | | | | — |
 | `Flux2KleinPipeline` | FLUX.2-klein | `black-forest-labs/FLUX.2-klein-4B`, `black-forest-labs/FLUX.2-klein-9B` | ✅︎ | ✅︎ | ✅︎ | ✅︎ | — |
@@ -10,12 +10,12 @@ A: Refer to [GPU memory calculation and configuration](../configuration/gpu_memo

 > Q: I encounter some bugs or CI problems, which is urgent. How can I solve it?

-A: Search the current [issues](https://github.com/vllm-project/vllm-omni/issues) first. If no existing issue matches a bug or CI failure, open a [bug report](https://github.com/vllm-project/vllm-omni/issues/new?template=400-bug-report.yml) with a minimal reproducer, environment details, and relevant logs. For technical or usage questions, use the `sig-omni` channel in [vLLM Slack](https://slack.vllm.ai/) or the [vLLM Forum](https://discuss.vllm.ai/).
+A: At first, you can check current [issues](https://github.com/vllm-project/vllm-omni/issues) to find possible solutions. If none of these satisfy your demand and it is urgent, please find these [volunteers](https://docs.vllm.ai/projects/vllm-omni/en/latest/community/volunteers/) for help.

 > Q: Does vLLM-Omni support AWQ or any other quantization?

-A: AWQ is available through the inherited vLLM quantization registry, and vLLM-Omni supports several additional methods. Actual support and validation vary by model, component, hardware, and checkpoint. See the [quantization overview](../user_guide/quantization/overview.md) for validated combinations and method-specific guides.
+A: We plan to introduce GGUF FP8 prequantized models and online FP8 quantization in version 0.16.0. Support for other quantization types will follow in future releases. For details, please see our [Q1 quantization roadmap](https://github.com/vllm-project/vllm-omni/issues/1057).

 > Q: Does vLLM-Omni support multimodal streaming input and output?

-A: Yes, for specific models and serving paths. Current capabilities include [streaming video input](../serving/video_stream_api.md), [streaming diffusion output](../user_guide/diffusion/execution_modes.md#streaming-output), and experimental full-duplex real-time audio described in the [project overview](../README.md). Check the model and API documentation because input and output support is model-specific.
+A: Not yet. We already put it on the [Roadmap](https://github.com/vllm-project/vllm-omni/issues/165). Please stay tuned!
@@ -1,23 +1,23 @@
 # Production Metrics

-vLLM-Omni exposes Prometheus metrics via the `/metrics` endpoint on the OpenAI-compatible API server.
+vLLM-Omni exposes Prometheus metrics via the `/metrics` endpoint on the OpenAI-compatible API server. This page covers the text and audio surface; diffusion / image / video metrics are tracked in a follow-up PR.

 ```bash
 vllm-omni serve Qwen/Qwen3-Omni-30B-A3B-Instruct --port 8000 --log-stats
 curl http://localhost:8000/metrics
 ```

-**`--log-stats` is required to populate metric data.** Without the flag, the endpoint still returns `200 OK` but the upstream `vllm:*` wrap is not registered at all, and the 15 `vllm_omni:*` families are registered as placeholders with no data written to them. This keeps the runtime cost essentially zero for deployments that don't need monitoring. With the flag, all ~80 families populate.
+**`--log-stats` is required to populate metric data.** Without the flag, the endpoint still returns `200 OK` but the upstream `vllm:*` wrap is not registered at all, and the 15 `vllm:omni_*` families are registered as placeholders with no data written to them. This keeps the runtime cost essentially zero for deployments that don't need monitoring. With the flag, all ~80 families populate.

 ## Metric Namespaces

 | Prefix | Source | Present when |
 |--------|--------|--------------|
-| `vllm_omni:` | vLLM-Omni orchestrator / audio modality / cross-stage transfer | Pipeline-dependent |
+| `vllm:omni_` | vLLM-Omni orchestrator / audio modality / cross-stage transfer | Pipeline-dependent |
 | `vllm:` | Upstream vLLM engine, wrapped by `OmniPrometheusStatLogger` to expose `{stage, replica}` | Pipeline includes an LLM (AR) stage |
 | `http_` / `process_` | Uvicorn / Python runtime | Always |

-## Pipeline-Level Metrics (`vllm_omni:`)
+## Pipeline-Level Metrics (`vllm:omni_`)

 Defined in `vllm_omni/metrics/prometheus.py`. Track request lifecycle across the full multi-stage pipeline.

@@ -25,66 +25,42 @@ Defined in `vllm_omni/metrics/prometheus.py`. Track request lifecycle across the

 | Metric | Type | Labels | Description |
 |--------|------|--------|-------------|
-| `vllm_omni:num_requests_running` | Gauge | `model_name` | Pipeline-global in-flight requests (dispatched to engine, not yet finalized) |
-| `vllm_omni:num_requests_waiting` | Gauge | `model_name` | Requests waiting in the Orchestrator queue |
-| `vllm_omni:requests_success_total` | Counter | `model_name`, `finished_reason` | Total requests by completion reason. `finished_reason` ∈ {`stop`, `length`, `abort`, ...} mirroring upstream `vllm:request_success_total`; aborts cover client disconnect / cancellation paths in addition to upstream `FinishReason.ABORT` |
+| `vllm:omni_num_requests_running` | Gauge | `model_name` | Pipeline-global in-flight requests (dispatched to engine, not yet finalized) |
+| `vllm:omni_num_requests_waiting` | Gauge | `model_name` | Requests waiting in the Orchestrator queue |
+| `vllm:omni_requests_success_total` | Counter | `model_name`, `finished_reason` | Total requests by completion reason. `finished_reason` ∈ {`stop`, `length`, `abort`, ...} mirroring upstream `vllm:request_success_total`; aborts cover client disconnect / cancellation paths in addition to upstream `FinishReason.ABORT` |

 ### Latency

 | Metric | Type | Labels | Description |
 |--------|------|--------|-------------|
-| `vllm_omni:e2e_request_latency_s` | Histogram | `model_name` | Pipeline-global end-to-end request latency in seconds |
+| `vllm:omni_e2e_request_latency_s` | Histogram | `model_name` | Pipeline-global end-to-end request latency in seconds |

-## Audio Modality Metrics (`vllm_omni:`)
+## Audio Modality Metrics (`vllm:omni_`)

 Emitted at request finalize, except for `audio_ttfp_s` (streaming-hook at the first audio packet) and `audio_underrun_s` / `audio_continuity_ok_total` (streaming finalize, after the chunk stream is exhausted). All carry `{model_name, stage, replica}` plus the listed extra label.

 | Metric | Type | Extra label | Description |
 |--------|------|-------------|-------------|
-| `vllm_omni:audio_ttfp_s` | Histogram | — | Time from request arrival to first audio packet/frame |
-| `vllm_omni:audio_duration_s` | Histogram | — | Audio content duration (`audio_frames / sample_rate`) |
-| `vllm_omni:audio_rtf` | Histogram | — | Real-time factor (`stage_gen_time_s / audio_duration_s`); streaming TTS SLO red line `< 1`; uses `RTF_BUCKETS` |
-| `vllm_omni:audio_frames_total` | Counter | — | Cumulative audio frame count; throughput via `rate()` |
-| `vllm_omni:audio_underrun_s` | Histogram | — | Per-request worst-case player deficit; `> 0` indicates listener heard silent gaps |
-| `vllm_omni:audio_continuity_ok_total` | Counter | `threshold_ms` | Incremented when the request's worst underrun stayed below `threshold_ms` |
-| `vllm_omni:audio_skipped_requests_total` | Counter | `reason` | Silent-loss counter — code2wav rejected malformed codec input and returned `200 OK` with empty audio |
+| `vllm:omni_audio_ttfp_s` | Histogram | — | Time from request arrival to first audio packet/frame |
+| `vllm:omni_audio_duration_s` | Histogram | — | Audio content duration (`audio_frames / sample_rate`) |
+| `vllm:omni_audio_rtf` | Histogram | — | Real-time factor (`stage_gen_time_s / audio_duration_s`); streaming TTS SLO red line `< 1`; uses `RTF_BUCKETS` |
+| `vllm:omni_audio_frames_total` | Counter | — | Cumulative audio frame count; throughput via `rate()` |
+| `vllm:omni_audio_underrun_s` | Histogram | — | Per-request worst-case player deficit; `> 0` indicates listener heard silent gaps |
+| `vllm:omni_audio_continuity_ok_total` | Counter | `threshold_ms` | Incremented when the request's worst underrun stayed below `threshold_ms` |
+| `vllm:omni_audio_skipped_requests_total` | Counter | `reason` | Silent-loss counter — code2wav rejected malformed codec input and returned `200 OK` with empty audio |

 The continuity math comes from `vllm_omni/benchmarks/audio_continuity.py::compute_continuity_stats` so the server-side observation aligns with the bench-side definition.

-## Diffusion Metrics (`vllm_omni:`)
-
-Per-request timing breakdowns for diffusion (image/video) stages. Emitted at request finalize when `stage_metrics.diffusion_metrics` is present. All carry `{model_name, stage, replica}`.
-
-| Metric | Type | Description |
-|--------|------|-------------|
-| `vllm_omni:diffusion_exec_s` | Histogram | DiT forward pass execution time per request in seconds |
-| `vllm_omni:diffusion_exec_per_step_s` | Histogram | DiT forward pass execution time per denoising step in seconds (`exec_s / num_inference_steps`) |
-| `vllm_omni:diffusion_preprocess_s` | Histogram | Diffusion input preprocessing time per request in seconds |
-| `vllm_omni:diffusion_postprocess_s` | Histogram | Diffusion output postprocessing (VAE decode) time per request in seconds |
-
-`diffusion_exec_s` uses `SECONDS_BUCKETS` (50 ms → 300 s); the other three use `SECONDS_FAST_BUCKETS` (1 ms → 60 s). `diffusion_exec_per_step_s` is skipped when `num_inference_steps` is not set.
-
-### Example PromQL
-
-```promql
-# P99 DiT exec time by stage
-histogram_quantile(0.99, rate(vllm_omni:diffusion_exec_s_bucket[5m]))
-
-# Ratio of preprocess to total exec wall time
-rate(vllm_omni:diffusion_preprocess_s_sum[5m])
-  / rate(vllm_omni:diffusion_exec_s_sum[5m])
-```
-
-## Cross-Stage Transfer Metrics (`vllm_omni:`)
+## Cross-Stage Transfer Metrics (`vllm:omni_`)

 Per-physical-transfer histograms tracking the data hop between adjacent stages. Labels `{model_name, from_stage, from_replica, to_stage, to_replica}` let dashboards attribute latency to specific replica edges. `from_replica` / `to_replica` are resolved from the orchestrator's sticky-routing binding (`stage_pool.get_bound_replica_id(request_id)`), so no extra plumbing through `TransferEdgeStats` is needed.

 | Metric | Type | Description |
 |--------|------|-------------|
-| `vllm_omni:transfer_size_bytes` | Histogram | Per-transfer payload size in bytes |
-| `vllm_omni:transfer_tx_s` | Histogram | Sender-side time (serialize + submit to connector) |
-| `vllm_omni:transfer_rx_s` | Histogram | Receiver-side time (recv + deserialize) |
-| `vllm_omni:transfer_in_flight_s` | Histogram | Network in-flight time (TX done → RX recv start) |
+| `vllm:omni_transfer_size_bytes` | Histogram | Per-transfer payload size in bytes |
+| `vllm:omni_transfer_tx_s` | Histogram | Sender-side time (serialize + submit to connector) |
+| `vllm:omni_transfer_rx_s` | Histogram | Receiver-side time (recv + deserialize) |
+| `vllm:omni_transfer_in_flight_s` | Histogram | Network in-flight time (TX done → RX recv start) |

 ## vLLM Engine Metrics (`vllm:`)

@@ -107,9 +83,9 @@ For the full list of upstream metrics, see [the vLLM docs](https://github.com/vl

 | Metric group | Multi-stage LLM (Qwen3-Omni) |
 |---|---|
-| `vllm_omni:` request tracking + latency | With `--log-stats` |
-| `vllm_omni:` audio modality | With `--log-stats`, if pipeline has a talker stage |
-| `vllm_omni:` transfer | With `--log-stats`, if pipeline has ≥ 2 stages |
+| `vllm:omni_` request tracking + latency | With `--log-stats` |
+| `vllm:omni_` audio modality | With `--log-stats`, if pipeline has a talker stage |
+| `vllm:omni_` transfer | With `--log-stats`, if pipeline has ≥ 2 stages |
 | `vllm:` engine metrics (per `(stage, replica)`) | With `--log-stats` |
 | `vllm:` MFU metrics | With `--log-stats --enable-mfu-metrics` |

@@ -118,5 +94,5 @@ For the full list of upstream metrics, see [the vLLM docs](https://github.com/vl
 - All time-bearing metrics use the `_s` suffix (values in seconds). Buckets are `SECONDS_BUCKETS` for e2e / generation-style values and `SECONDS_FAST_BUCKETS` (1 ms → 60 s) for the fine-grained transfer and audio-underrun values.
 - Counters use the `_total` suffix (auto-appended by `prometheus_client`).
 - Sizes use the `_bytes` suffix.
- All omni-specific families are prefixed `vllm_omni:`. The upstream `unregister_vllm_metrics()` function is monkey-patched (see `vllm_omni/patch.py`) to a scoped version that still strips upstream `vllm:*` collectors so multi-engine init within one process does not crash on duplicate registration, but preserves anything prefixed `vllm_omni:`.
- Text and audio first-output use distinct families (`vllm:time_to_first_token_seconds` reused from upstream for text; `vllm_omni:audio_ttfp_s` for audio) rather than a single metric with a `modality` label.
+- All omni-specific families are prefixed `vllm:omni_`. The upstream `unregister_vllm_metrics()` function is monkey-patched (see `vllm_omni/patch.py`) to a scoped version that still strips upstream `vllm:*` collectors so multi-engine init within one process does not crash on duplicate registration, but preserves anything prefixed `vllm:omni_` / `vllm_omni`.
+- Text and audio first-output use distinct families (`vllm:time_to_first_token_seconds` reused from upstream for text; `vllm:omni_audio_ttfp_s` for audio) rather than a single metric with a `modality` label.
@@ -1,192 +1,494 @@
 # Diffusion Attention Backends

-Use this page to select and configure a diffusion attention backend. Backend-
-specific installation, tuning, and compatibility details live in separate
-guides so that the selection contract stays easy to scan.
+This document describes the diffusion attention backends available in vLLM-Omni, how to select them globally and per-role, the per-platform defaults, and how to use SageAttention.

-Diffusion attention backend selection applies to DiT attention in image and
-video generation models. It does **not** change autoregressive LLM attention,
-which uses vLLM's attention selector.
+## Overview

-For the internal selector, registry, and platform contract, see
-[Attention Backend Selection](../../design/feature/attention_backend_selection.md).
+Diffusion attention backend selection is resolved in `vllm_omni.diffusion.attention.selector`. It looks up the backend from a structured `AttentionConfig` carried on `OmniDiffusionConfig` and falls back to the platform default when nothing is configured.

-## Choose a guide
+This backend is used by diffusion attention layers such as the DiT attention in video and image generation models. It does **not** affect autoregressive (LLM) attention paths — those go through vLLM's own attention backend selector.

-| Need | Guide |
-| --- | --- |
-| Select a conservative or platform-native dense kernel | [Dense Backends](attention_backends/dense_backends.md) |
-| Use FlashInfer trtllm-gen FMHA, Skip-Softmax, or TRTLLM SAGE quantization | [TRTLLM Attention](attention_backends/trtllm.md) |
-| Install and use SageAttention 2.2 or SageAttention3 | [SageAttention](attention_backends/sage.md) |
-| Match training or rollout kernels loaded from Hugging Face | [Hugging Face Hub Backends](attention_backends/huggingface_hub.md) |
-| Use block-sparse video attention on Ascend NPU | [RainFusion](attention_backends/rainfusion.md) |
+The full set of backends and their platform defaults is in the **Backend Options** and **Platform Defaults** sections below. If no attention backend is configured, vLLM-Omni asks the current platform to choose the default.

-## Backend options
+## Backend Options
+
+| Value | Notes |
+|---|---|
+| `TRTLLM_ATTN` | FlashInfer's trtllm-gen FMHA (TensorRT-LLM's generated kernels, vendored by FlashInfer). Dense BF16, GQA native, `head_dim=128`. Datacenter Blackwell only (sm_100 / sm_103). Packed paths can provide `cu_seqlens` directly. Supports optional **Skip-Softmax** sparse attention — see below. Requires `flashinfer`. |
+| `FLASH_ATTN` | Wraps FlashAttention 4 on Blackwell when `flash-attn-4` is installed, then falls back to FlashAttention 3/2. Default on Hopper / Ada / Ampere when a compatible FlashAttention package is installed. |
+| `CUDNN_ATTN` | Pins `sdpa_kernel([CUDNN_ATTENTION])`. Default on Blackwell (sm_10x / sm_12x) with cuDNN ≥ 9.5. Wins on mask-heavy DiTs (HunyuanVideo-1.5: 2× e2e vs SDPA). |
+| `FLASHINFER_ATTN` | Uses FlashInfer's batch-prefill wrapper and supports mixed Q/K and V input dtypes through backend-specific configuration. Used as Blackwell fallback when cuDNN is unavailable. Requires `flashinfer` >= 0.6.16rc1 for mixed-dtype configurations. |
+| `TORCH_SDPA` | PyTorch `scaled_dot_product_attention` with the default backend dispatcher. Most conservative; always available. |
+| `SAGE_ATTN` | SageAttention 2.2 — INT8-quantized attention with FP16 accumulation. Lossy but typically visually indistinguishable on diffusion outputs. Requires `sageattention`. |
+| `SAGE_ATTN_3` | Requires `sageattn3` from `SageAttention/sageattention3_blackwell`. CUDA only, intended for Blackwell GPUs, with GQA/MQA requests falling back to PyTorch SDPA. |
+| `FLASH_ATTN_HUB` | FlashAttention 2 from HuggingFace `kernels` library. Useful for train/rollout alignment. |
+| `FLASH_ATTN_3_HUB` | FlashAttention 3 from HuggingFace `kernels` library. CUDA Hopper (sm_90+) only; falls back to `FLASH_ATTN_HUB` on older GPUs. |
+| `RAINFUSION_ATTN` | MindIE-SD **RainFusion** block-sparse video attention — see [below](#rainfusion_attn-backend-and-block-sparse-video-attention). Ascend NPU only; requires `mindiesd`. Delegates to `FLASH_ATTN` for anything that is not a packed video sequence. |

-| Value | Family | Primary use | Detail |
-| --- | --- | --- | --- |
-| `TORCH_SDPA` | Dense | Conservative reference; always available | [Dense Backends](attention_backends/dense_backends.md#torch_sdpa) |
-| `FLASH_ATTN` | Dense | FlashAttention 4/3/2 depending on the installed package and GPU | [Dense Backends](attention_backends/dense_backends.md#flash_attn) |
-| `CUDNN_ATTN` | Dense | Mask-heavy DiTs on Blackwell with cuDNN 9.5 or newer | [Dense Backends](attention_backends/dense_backends.md#cudnn_attn) |
-| `FLASHINFER_ATTN` | Dense or quantized | FlashInfer batch prefill; optional mixed Q/K and V dtypes | [Dense Backends](attention_backends/dense_backends.md#flashinfer_attn) |
-| `TRTLLM_ATTN` | Dense, sparse, or quantized | Datacenter Blackwell with `head_dim=128` and compatible packed paths | [TRTLLM Attention](attention_backends/trtllm.md) |
-| `SAGE_ATTN` | Quantized | SageAttention 2.2 INT8 attention | [SageAttention](attention_backends/sage.md#sage_attn) |
-| `SAGE_ATTN_3` | Quantized | SageAttention3 on Blackwell | [SageAttention](attention_backends/sage.md#sage_attn_3) |
-| `FLASH_ATTN_HUB` | Hub kernel | FlashAttention 2 from Hugging Face `kernels` | [Hugging Face Hub Backends](attention_backends/huggingface_hub.md) |
-| `FLASH_ATTN_3_HUB` | Hub kernel | FlashAttention 3 from Hugging Face `kernels` on Hopper or newer | [Hugging Face Hub Backends](attention_backends/huggingface_hub.md) |
-| `RAINFUSION_ATTN` | Block sparse | MindIE-SD RainFusion video attention on Ascend NPU | [RainFusion](attention_backends/rainfusion.md) |

 ## Configuration

-Backend selection is resolved in this order:
+Diffusion attention backends can be configured three ways, in priority order:

-1. `--diffusion-attention-config` per-role configuration.
-2. `--diffusion-attention-backend` or `DIFFUSION_ATTENTION_BACKEND` as a
-   global default.
-3. The current platform's default.
+1. **`--diffusion-attention-config`** — structured per-role config (highest priority).
+2. **`--diffusion-attention-backend` / `DIFFUSION_ATTENTION_BACKEND` env var** — global shorthand that sets the default backend.
+3. **Platform default** — used when nothing is configured.

-`--diffusion-attention-backend` is shorthand for
-`--diffusion-attention-config.default.backend`. Do not pass it together with an
-explicit `default.backend` in the structured configuration.
+`--diffusion-attention-backend` is shorthand for `--diffusion-attention-config.default.backend`. It may be combined with `--diffusion-attention-config.per_role.*` overrides, but is mutually exclusive with `--diffusion-attention-config.default.backend`.

 ### Global default

-```bash
-vllm-omni serve <model> --diffusion-attention-backend FLASH_ATTN
+Set the default backend for every diffusion attention layer:

-# Backwards-compatible environment variable
-export DIFFUSION_ATTENTION_BACKEND=FLASH_ATTN
+```bash
+# CLI flag
+vllm-omni serve <model> --diffusion-attention-backend SAGE_ATTN
+
+# Environment variable (also recognized for backwards compatibility)
+export DIFFUSION_ATTENTION_BACKEND=SAGE_ATTN
 ```

 ### Per-role configuration

-Roles are declared by each diffusion model. Common categories are `self` and
-`cross`; a model may also use a more specific role such as
-`ltx2.audio_to_video`. Resolution order is:
+Roles are free-form strings declared by each diffusion model. The two common categories are `"self"` and `"cross"`; model-specific roles (e.g. `"ltx2.audio_to_video"`) may also be declared. A role string is matched in this order:

-1. Exact `per_role[role]` match.
-2. Category `per_role[role_category]` match.
-3. `default`.
-4. Platform default.
+1. Exact `per_role[role]` match
+2. `per_role[role_category]` fallback (e.g. `"ltx2.audio_to_video"` → `"cross"`)
+3. `default`
+4. Platform default
+
+Use vLLM-style dotted flags or one JSON blob:

 ```bash
 # Dotted flags
 vllm-omni serve <model> \
-  --diffusion-attention-config.default.backend FLASH_ATTN \
-  --diffusion-attention-config.per_role.cross.backend TORCH_SDPA
+    --diffusion-attention-config.default.backend FLASH_ATTN \
+    --diffusion-attention-config.per_role.cross.backend TORCH_SDPA

-# Equivalent JSON
+# JSON
 vllm-omni serve <model> \
-  --diffusion-attention-config \
-  '{"default":{"backend":"FLASH_ATTN"},"per_role":{"cross":{"backend":"TORCH_SDPA"}}}'
+    --diffusion-attention-config '{"default":{"backend":"FLASH_ATTN"},"per_role":{"cross":{"backend":"TORCH_SDPA"}}}'
 ```

-### Python API
+A backend that needs configuration exposes it as a typed field on the spec:
+`TRTLLM_ATTN`'s Skip-Softmax (see [below](#trtllm_attn-backend-and-skip-softmax)) and
+`RAINFUSION_ATTN`'s RainFusion block (see [below](#rainfusion_attn-backend-and-block-sparse-video-attention)):
+
+```bash
+--diffusion-attention-config.default.backend TRTLLM_ATTN \
+--diffusion-attention-config.default.skip_softmax.target_sparsity 0.5
+```
+
+### Programmatic API
+
+When constructing `OmniDiffusionConfig` directly:

 ```python
-from vllm_omni.diffusion.data import (
-    AttentionConfig,
-    AttentionSpec,
-    OmniDiffusionConfig,
-)
+from vllm_omni.diffusion.data import AttentionConfig, AttentionSpec, AttnQuantSpec, OmniDiffusionConfig

 config = OmniDiffusionConfig(
    diffusion_attention_config=AttentionConfig(
        default=AttentionSpec(backend="FLASH_ATTN"),
-        per_role={"cross": AttentionSpec(backend="TORCH_SDPA")},
+        per_role={
+            "cross": AttentionSpec(backend="TORCH_SDPA"),
+        },
    ),
    ...,
 )
 ```

-Backend-specific typed blocks are documented with their consumers:
+A plain dict is also accepted and normalized to `AttentionConfig`.

- `quant`: [FlashInfer](attention_backends/dense_backends.md#flashinfer-quantized-attention)
-  and [TRTLLM SAGE](attention_backends/trtllm.md#sage-quantization).
- `skip_softmax`: [TRTLLM Skip-Softmax](attention_backends/trtllm.md#skip-softmax).
- `block_sparse`: [RainFusion](attention_backends/rainfusion.md#configuration).
+#### FlashInfer QK16/V8 quantized attention

-## Platform defaults
+`FLASHINFER_ATTN` accepts quantization options through `AttentionSpec.quant`. For QK16/V8:
+
+```python
+config = OmniDiffusionConfig(
+    diffusion_attention_config=AttentionConfig(
+        default=AttentionSpec(
+            backend="FLASHINFER_ATTN",
+            quant=AttnQuantSpec(
+                dtype_qk="bfloat16",
+                dtype_vo="fp8_e4m3",
+            ),
+        ),
+    ),
+    ...,
+)
+```
+
+`dtype_qk` configures the Q and K input dtypes. `dtype_vo` configures the V input dtype.
+
+## Platform Defaults

 ### Blackwell (sm_100 / sm_103 / sm_120 / sm_121)

-The CUDA auto-route preference is:
+Auto-route preference, in order:

-1. `TRTLLM_ATTN` on datacenter Blackwell (sm_100/sm_103) when FlashInfer is
-   available, `head_dim=128`, and the model declares a compatible packed or
-   mask-free path.
-2. `CUDNN_ATTN` when cuDNN 9.5 or newer is available.
-3. `FLASHINFER_ATTN` when FlashInfer is available but cuDNN is too old.
-4. `FLASH_ATTN` when a compatible package is installed.
-5. `TORCH_SDPA`.
+1. `TRTLLM_ATTN` — on **datacenter** Blackwell (sm_100 / sm_103) when `flashinfer` is installed, the model's `head_dim` is 128, **and the model declares a compatible packed/mask-free path**
+2. `CUDNN_ATTN` — when cuDNN ≥ 9.5 is available (ships in PyTorch 2.5+ wheels)
+3. `FLASHINFER_ATTN` — when `flashinfer` is installed but cuDNN < 9.5
+4. `FLASH_ATTN` — when `flash-attn` is installed with the Blackwell CUTE kernel
+5. `TORCH_SDPA` — last resort

-`TRTLLM_ATTN` is not auto-selected on workstation Blackwell
-(sm_120/sm_121), for other head dimensions, or for paths that require an
-unsupported mask.
+`TRTLLM_ATTN` is skipped on workstation Blackwell (sm_120 / sm_121) and for any `head_dim != 128`, so those GPUs keep the `CUDNN_ATTN` route described below.

-### Hopper, Ada, and Ampere
+`TRTLLM_ATTN` outranks `CUDNN_ATTN` on datacenter Blackwell for compatible packed/mask-free pipelines. Workstation Blackwell (sm_120 / sm_121) and pipelines that require attention masks retain their normal fallback.

-The CUDA auto-route uses `FLASH_ATTN` when available and otherwise falls back
-to `TORCH_SDPA`. `CUDNN_ATTN` and `FLASHINFER_ATTN` remain explicit options.
+The startup log line `Defaulting to diffusion attention backend CUDNN_ATTN (Blackwell sm_120, cuDNN 91002)` confirms the route.

-Other platforms validate an explicit backend and choose their own default
-through the platform implementation. Check the startup log to confirm the
-resolved backend.
+**Why CUDNN_ATTN by default**: on mask-heavy diffusion models (HunyuanVideo-1.5, Qwen-Image), cuDNN's pinned FMHA kernel sidesteps a PyTorch SDPA dispatch quirk where the unpinned dispatcher picks `EFFICIENT_ATTENTION` (~25 ms) for masked calls instead of cuDNN (~11 ms). The pin gives 2× e2e on HV-1.5 with no regression on lighter models.

-## Choosing a backend manually
+### Hopper (sm_90) / Ada (sm_89) / Ampere (sm_80–sm_86)

-Override the platform default when you need:
+Auto-route preference:

- a correctness reference (`TORCH_SDPA`);
- a backend-specific workaround;
- training/rollout kernel alignment (Hub backends); or
- an explicitly validated sparse or quantized speedup.
+1. `FLASH_ATTN` — when `flash-attn` is installed
+2. `TORCH_SDPA` — fallback

-The startup log prints the resolved backend and whether it came from explicit
-configuration or platform defaulting. If no resolution message appears, check
-earlier logs for diffusion-stage initialization failures.
+`CUDNN_ATTN` and `FLASHINFER_ATTN` are still selectable via env var on these GPUs but are not in the auto-route — FlashAttention 2 is the well-tuned path on pre-Blackwell hardware.

-## Reference benchmark
+## TRTLLM_ATTN Backend and Skip-Softmax

-The following BF16 results were measured on an sm_120 RTX Pro 6000 Blackwell
-with the same prompt and seed across runs. Treat them as reference results, not
-portable guarantees.
+`TRTLLM_ATTN` runs FlashInfer's trtllm-gen FMHA. Dense it is a BF16 backend like the others; on top of
+that it can enable **Skip-Softmax**, a sparse-attention mode that trades a little fidelity for speed
+(algorithm: [design doc](../../design/feature/skip_softmax.md)).

-| Model | Shape | `TORCH_SDPA` | `CUDNN_ATTN` | `FLASHINFER_ATTN` |
-| --- | --- | ---: | ---: | ---: |
+Enable it through the typed `skip_softmax` block on the attention spec:
+
+| Key | Valid values | Meaning |
+|---|---|---|
+| `target_sparsity` | finite, `[0, 1]` | Operating point on a calibrated curve. Needs a calibration for the model. |
+| `threshold` | finite, `≥ 0` | Direct threshold, no calibration needed. Mutually exclusive with `target_sparsity`. |
+| `disabled_until_timestep` | finite, `[0, 1]` | Holds early, high-noise steps dense; skip turns on once the normalized timestep `t ≤ D`. |
+
+```bash
+vllm-omni serve Wan-AI/Wan2.2-T2V-A14B-Diffusers \
+  --diffusion-attention-config '{"default": {"backend": "TRTLLM_ATTN",
+      "skip_softmax": {"target_sparsity": 0.65, "disabled_until_timestep": 0.86}}}'
+```
+
+Programmatically the same block is a typed `SkipSoftmaxSpec` (values validated at construction):
+
+```python
+from vllm_omni.diffusion.data import AttentionConfig, AttentionSpec, SkipSoftmaxSpec
+
+AttentionConfig(
+    default=AttentionSpec(
+        backend="TRTLLM_ATTN",
+        skip_softmax=SkipSoftmaxSpec(target_sparsity=0.65, disabled_until_timestep=0.86),
+    ),
+)
+```
+
+**Start at `target_sparsity=0.65, disabled_until_timestep=0.86`** and raise `target_sparsity` only
+as far as your quality bar allows — the output diverges from dense as it climbs. The gain grows with
+sequence length, since Skip-Softmax only accelerates attention. Dense BF16 is `TRTLLM_ATTN` with no
+`skip_softmax` block.
+
+Requires datacenter Blackwell with `head_dim == 128`; elsewhere, or without FlashInfer, selecting
+`TRTLLM_ATTN` raises rather than silently degrading.
+
+## TRTLLM_ATTN SAGE Quantization
+
+On top of dense/Skip-Softmax, `TRTLLM_ATTN` can run **SAGE** (SageAttention) — the trtllm-gen
+FMHA kernel with per-block quantized Q/K and per-channel fp8 V, so the two attention matmuls run
+in low precision. Enable it through the typed `quant` block on the attention spec:
+
+| Key | Valid values | Meaning |
+|---|---|---|
+| `dtype_qk` | `int8`, `fp8_e4m3` | Quantization dtype for Q and K. Absent ⇒ dense (SAGE off). |
+| `q_block_size` | `1`, `4`, `16` | Per-token block size for Q scales (default `1`). |
+| `k_block_size` | `1`, `4`, `16` | Per-token block size for K scales (default `16`). |
+
+V is always quantized per-channel to fp8_e4m3 and K-smoothing is applied inside the routine, so
+neither is a user knob. Only block sizes `1`, `4`, `16` have compiled kernels.
+
+The `quant` block is a shared `AttnQuantSpec` consumed by more than one backend; each reads the
+fields that apply and rejects the rest. `TRTLLM_ATTN` (SAGE) reads `dtype_qk` (`int8` / `fp8_e4m3`),
+`q_block_size`, and `k_block_size`; `FLASHINFER_ATTN` reads `dtype_qk` (`float16` / `bfloat16`),
+`dtype_vo`, and `flashinfer_backend` (see its section). A `dtype_qk` from the wrong set raises.
+
+```bash
+vllm-omni serve Wan-AI/Wan2.2-T2V-A14B-Diffusers \
+  --diffusion-attention-config '{"default": {"backend": "TRTLLM_ATTN",
+      "quant": {"dtype_qk": "fp8_e4m3", "q_block_size": 1, "k_block_size": 16}}}'
+```
+
+```python
+from vllm_omni.diffusion.data import AttentionConfig, AttentionSpec, AttnQuantSpec
+
+AttentionConfig(
+    default=AttentionSpec(
+        backend="TRTLLM_ATTN",
+        quant=AttnQuantSpec(dtype_qk="fp8_e4m3", q_block_size=1, k_block_size=16),
+    ),
+)
+```
+
+**Requirements.** Needs FlashInfer ≥ 0.6.16rc1. Kernel
+availability is arch-dependent: `fp8_e4m3` QK has kernels on both **SM100** (B200) and **SM103**
+(B300); `int8` QK kernels are compiled for **SM100 only**.
+
+## RAINFUSION_ATTN Backend and Block-Sparse Video Attention
+
+`RAINFUSION_ATTN` runs MindIE-SD's RainFusion (`rf_v2`) kernel on Ascend NPU. It pools each
+128-token block of keys, ranks them per query block, and computes attention against only the
+top-scoring ones. Video tokens are rearranged into `(t, h, w)` order first, so the kept blocks are
+spatiotemporal neighbours rather than arbitrary rows of the packed sequence.
+
+Only the video segment is sparsified. The prefix rows (text, visual conditions, audio) and the
+first-frame blocks are always kept dense, which is why the realized sparsity is lower than the
+nominal `sparsity` you configure. Anything the kernel cannot handle — a warmup denoise step, an
+exempt layer, a sequence with no published video geometry, a video segment under 32 blocks —
+delegates to `FLASH_ATTN`, so a model can select this backend unconditionally.
+
+Enable it through the typed `block_sparse` block on the attention spec, shared by every
+block-sparse backend:
+
+| Key | Valid values | Meaning |
+|---|---|---|
+| `sparsity` | finite, `[0, 1]` | Nominal fraction of key blocks dropped per query block. `0` disables sparsity. Defaults to `0.8`. |
+| `start_step` | `≥ 0` | Keep the first N denoise steps dense. Layout is decided early, so these steps dominate structural fidelity. |
+| `skip_layers` | index selector, e.g. `"0-3,38"` | DiT blocks that always stay dense. |
+
+```bash
+vllm-omni serve MiniMaxAI/MiniMax-H3 \
+  --diffusion-attention-config '{"default": {"backend": "RAINFUSION_ATTN",
+      "block_sparse": {"sparsity": 0.8, "start_step": 0}}}'
+```
+
+Programmatically the same block is a typed `BlockSparseSpec` (values validated at construction):
+
+```python
+from vllm_omni.diffusion.data import AttentionConfig, AttentionSpec, BlockSparseSpec
+
+AttentionConfig(
+    default=AttentionSpec(
+        backend="RAINFUSION_ATTN",
+        block_sparse=BlockSparseSpec(sparsity=0.8, start_step=0, skip_layers="0-1"),
+    ),
+)
+```
+
+**Tune in the order `start_step` → `sparsity` → `skip_layers`.** Raise `start_step` first: it is the
+cheapest way to recover structure, because the early high-noise steps decide global layout while the
+later steps only refine texture. Then walk `sparsity` up to your quality bar. Reach for
+`skip_layers` last, once an A/B against dense at the same seed points at specific blocks.
+
+Requires Ascend NPU with `mindiesd`; selecting it on any other platform raises. It is also
+incompatible with ring sequence parallelism, since `rf_v2` needs the whole key sequence to rank
+blocks — use Ulysses SP (`ring_degree=1`).
+
+### Which geometries run sparse
+
+MindIE-SD rf_v2 handles arbitrary video grids by spatially rearranging video first and, when
+necessary, promoting a real-video suffix to its always-kept prefix segment. It never pads: rf_v2
+does not consume an attention mask for padded keys. The remaining video rows stay sparse, while the
+promoted rows remain visible to every query and key.
+
+For example, MiniMax-H3 at 1344x768 has grid `(62, 24, 42)`: its 62496 video rows leave a 32-row
+128-block residue, and its two non-8-wide latent columns form a 2928-row rearranged suffix.
+MindIE-SD promotes 2976 rows, leaving 59520 sparse rows (`465 × 128`). This keeps the block mask
+and kernel tiling aligned, at the cost of retaining more blocks.
+
+8x8-aligned spatial grids remain preferable for performance. A latent `h` or `w` not divisible by 8
+creates an always-kept residual suffix and lowers realized sparsity. "Multiple of 8" on the latent
+grid means **width and height that are multiples of 256**. This path requires a MindIE-SD release
+that implements protected video tails for rf_v2.
+
+## End-to-End Benchmark (BF16, sm_120 RTX Pro 6000 Blackwell)
+
+Same prompt and seed across runs. `Total generation time` from `text_to_video.py` / `text_to_image.py`.
+
+| Model | Shape | TORCH_SDPA | CUDNN_ATTN | FLASHINFER_ATTN |
+|---|---|---|---|---|
 | HunyuanVideo-1.5 (T2V) | 480p / 33f / 50 steps | 147.05 s | **73.02 s** | 127.84 s |
 | Wan 2.2 14B (T2V) | 480p / 33f / 40 steps | 117.75 s | 117.17 s | **115.07 s** |
 | Qwen-Image (T2I) | 1024² / 50 steps | 17.41 s | **15.14 s** | 16.02 s |
 | FLUX.2-dev (T2I) | 1024² / 50 steps, TP=2 | 53.62 s | **53.30 s** | 54.94 s |

-Mask-heavy DiTs favored `CUDNN_ATTN`; lighter-mask or TP-saturated workloads
-were close enough that users should benchmark their exact model and shape.
+Pattern: mask-heavy DiTs (HV-1.5, Qwen-Image) favor `CUDNN_ATTN`; lighter-mask DiTs and TP-saturated configs (Wan 2.2, FLUX.2 TP=2) tie within noise.

-## Compatibility anchors
+## Known Limitations

-The following headings preserve links to sections that moved into dedicated
-guides.
+### LTX-2.0: `CUDNN_ATTN` crashes under torch.compile

-## TRTLLM_ATTN Backend and Skip-Softmax
+LTX-2's audio attention has a symbolic head_dim under torch.compile tracing. cuDNN's SDPA backend selector rejects symbolic dims and Dynamo aborts compilation. Tracked in [#3121](https://github.com/vllm-project/vllm-omni/issues/3121).

-See [TRTLLM Attention](attention_backends/trtllm.md#skip-softmax).
+**Workaround**: explicitly select `FLASHINFER_ATTN` or `TORCH_SDPA` for LTX-2.0:

-## TRTLLM_ATTN SAGE Quantization
+```bash
+DIFFUSION_ATTENTION_BACKEND=FLASHINFER_ATTN python examples/offline_inference/text_to_video/text_to_video.py \
+    --model Lightricks/LTX-2 ...
+```

-See [TRTLLM Attention](attention_backends/trtllm.md#sage-quantization).
+### FlashAttention-4 on Blackwell

-## RAINFUSION_ATTN Backend and Block-Sparse Video Attention
+Install the optional CUDA 13 extra to use the CuTe-based FA4 path:

-See [RainFusion](attention_backends/rainfusion.md).
+```bash
+pip install 'vllm-omni[fa4]'
+```
+
+`FLASH_ATTN` prefers `flash_attn.cute` on Blackwell and falls back to FA3/FA2
+when it is unavailable. Version `4.0.0b18` is required; earlier beta
+wheels had known JIT failures on Blackwell.
+
+## Choosing a Backend Manually
+
+### When to override the default
+
+- **Quality validation**: compare a new backend against `TORCH_SDPA` as the reference, since SDPA's default dispatcher is the most extensively tested.
+- **Lossy speedup hunting**: try `SAGE_ATTN` (INT8 quantized) on diffusion outputs — typically indistinguishable visually but always validate.
+- **Workaround for known issues**: see Known Limitations above.
+
+### Verifying which backend is in use
+
+The startup log prints one of:
+
+```
+Using diffusion attention backend 'CUDNN_ATTN'           # explicit override
+Defaulting to diffusion attention backend CUDNN_ATTN ... # auto-route
+Defaulting to diffusion attention backend SDPA           # nothing else available
+```
+
+If you don't see one of these, the model didn't reach diffusion stage init — check earlier logs for failures.

 ## SageAttention Installation

-See [SageAttention](attention_backends/sage.md#installation).
+vLLM-Omni expects SageAttention to be installed into the same Python environment as vLLM-Omni.
+
+Build from source:
+
+```bash
+git clone https://github.com/thu-ml/SageAttention.git
+cd SageAttention
+
+export EXT_PARALLEL=4 NVCC_APPEND_FLAGS="--threads 8" MAX_JOBS=32
+pip install . --no-build-isolation
+```
+
+Quick check:
+
+```bash
+python -c "import sageattention; print(sageattention.__file__)"
+```

 ## SageAttention3 Installation

-See [SageAttention](attention_backends/sage.md#sageattention3-installation).
+vLLM-Omni expects SageAttention3 to be installed into the same Python environment as vLLM-Omni.
+
+Build from source:
+
+```bash
+git clone https://github.com/thu-ml/SageAttention.git
+cd SageAttention/sageattention3_blackwell
+python setup.py install
+```
+
+Quick check:
+
+```bash
+python -c "import sageattn3; print(sageattn3.__file__)"
+```
+
+Notes:
+
+- `SAGE_ATTN_3` is only selected on CUDA when `sageattn3` is importable and the GPU is Blackwell-class.
+- SageAttention3's Blackwell kernel assumes `Hq == Hkv`. In vLLM-Omni, GQA/MQA diffusion requests fall back to PyTorch SDPA for correctness.

 ## HuggingFace Kernels Hub Backends

-See [Hugging Face Hub Backends](attention_backends/huggingface_hub.md).
+To achieve perfect numerical consistency between **training** (typically using HuggingFace Diffusers with Hub kernels) and **serving/rollout** (using vLLM-Omni), you can use the Hub-based attention backends. This eliminates numerical drift / sampling divergence caused by executing different local kernel versions during rollout.
+
+The following backend options are supported:
+- `FLASH_ATTN_HUB` (HuggingFace `kernels-community/flash-attn2`)
+- `FLASH_ATTN_3_HUB` (HuggingFace `kernels-community/flash-attn3`, Hopper sm_90+ only)
+
+### Installation
+
+To use these backends, you must install the `kernels` library:
+
+```bash
+pip install kernels==0.14.1
+```
+
+If the `kernels` library is not available in the environment, vLLM-Omni will log a warning and fall back gracefully to the corresponding local backend implementations (`FLASH_ATTN`). On CUDA GPUs below Hopper (compute capability < 9.0), `FLASH_ATTN_3_HUB` falls back to `FLASH_ATTN_HUB`.
+
+### Usage
+
+Select a Hub backend using the global CLI flag or environment variables:
+
+```bash
+# Environment variable
+export DIFFUSION_ATTENTION_BACKEND=FLASH_ATTN_HUB
+
+# CLI flag
+vllm-omni serve <model> --diffusion-attention-backend FLASH_ATTN_HUB
+```
+
+## Usage Examples
+
+### Default (auto-route)
+
+```bash
+python examples/offline_inference/text_to_video/text_to_video.py \
+    --model hunyuanvideo-community/HunyuanVideo-1.5-Diffusers-480p_t2v \
+    --prompt "A dog running across a field of golden wheat." \
+    --height 480 --width 832 --num-frames 33 \
+    --num-inference-steps 50 --seed 42 --guidance-scale 6.0 \
+    --output hv15.mp4
+```
+
+On Blackwell this picks `CUDNN_ATTN` automatically. Check the log for the `Defaulting to ...` line.
+
+### Explicit backend selection
+
+```bash
+DIFFUSION_ATTENTION_BACKEND=FLASHINFER_ATTN python examples/offline_inference/text_to_video/text_to_video.py \
+    --model Lightricks/LTX-2 \
+    --prompt "A dog running across a field of golden wheat." \
+    --height 480 --width 832 --num-frames 33 \
+    --num-inference-steps 40 --seed 42 --guidance-scale 4.0 \
+    --output ltx2.mp4
+```
+
+### SageAttention (lossy)
+
+```bash
+DIFFUSION_ATTENTION_BACKEND=SAGE_ATTN python examples/offline_inference/text_to_video/text_to_video.py \
+    --model hunyuanvideo-community/HunyuanVideo-1.5-Diffusers-480p_t2v \
+    --prompt "A dog running across a field of golden wheat." \
+    --height 480 --width 832 --num-frames 33 \
+    --num-inference-steps 30 --seed 42 --guidance-scale 6.0 \
+    --tensor-parallel-size 2 \
+    --output hv15_sage.mp4
+```
+
+Example: Wan2.2 TI2V 5B
+
+```bash
+DIFFUSION_ATTENTION_BACKEND=SAGE_ATTN python examples/offline_inference/text_to_video/text_to_video.py \
+    --model Wan-AI/Wan2.2-TI2V-5B-Diffusers \
+    --prompt "A dog running across a field of golden wheat." \
+    --height 704 --width 1280 --num-frames 49 \
+    --num-inference-steps 30 --seed 42 --guidance-scale 5.0 \
+    --tensor-parallel-size 2 \
+    --output outputs/wan22_sage.mp4
+```
+
+### Enable SageAttention3
+
+Example:
+
+```bash
+DIFFUSION_ATTENTION_BACKEND=SAGE_ATTN_3 python examples/offline_inference/text_to_video/text_to_video.py \
+    --model hunyuanvideo-community/HunyuanVideo-1.5-Diffusers-480p_t2v \
+    --prompt "A dog running across a field of golden wheat." \
+    --height 480 --width 832 --num-frames 33 \
+    --num-inference-steps 30 --seed 42 --guidance-scale 6.0 \
+    --tensor-parallel-size 2 \
+    --output outputs/hv15_sage3.mp4
+```
@@ -1,110 +0,0 @@
-# Dense Attention Backends
-
-Use these backends when you want dense attention without backend-specific
-sparsity. Start with `TORCH_SDPA` for correctness comparisons, then benchmark
-the fastest compatible kernel for your model, shape, and hardware.
-
-For selection precedence and per-role configuration, see the
-[attention backend overview](../attention_backends.md).
-
-## `TORCH_SDPA`
-
-`TORCH_SDPA` calls PyTorch `scaled_dot_product_attention` and lets PyTorch's
-dispatcher choose the implementation. It is always available and is the most
-conservative reference when validating another backend.
-
-```bash
-vllm-omni serve <model> --diffusion-attention-backend TORCH_SDPA
-```
-
-## `FLASH_ATTN`
-
-`FLASH_ATTN` uses the installed FlashAttention implementation. On Blackwell it
-prefers the CuTe-based FlashAttention 4 path and falls back to
-FlashAttention 3 or 2 when that path is unavailable. On Hopper, Ada, and
-Ampere it is the preferred automatic route when a compatible package is
-installed.
-
-```bash
-vllm-omni serve <model> --diffusion-attention-backend FLASH_ATTN
-```
-
-### FlashAttention 4 on Blackwell
-
-Install the optional CUDA 13 extra:
-
-```bash
-pip install 'vllm-omni[fa4]'
-```
-
-Version `4.0.0b18` is required; earlier beta wheels had known JIT failures on
-Blackwell. If the CuTe path is unavailable, the backend falls back to the
-compatible FlashAttention 3 or 2 path.
-
-## `CUDNN_ATTN`
-
-`CUDNN_ATTN` pins PyTorch SDPA to `CUDNN_ATTENTION`. It is particularly useful
-for mask-heavy DiTs and is automatically preferred on Blackwell when cuDNN
-9.5 or newer is available and the higher-priority TRTLLM route is not
-compatible.
-
-```bash
-vllm-omni serve <model> --diffusion-attention-backend CUDNN_ATTN
-```
-
-### LTX-2.0 limitation
-
-LTX-2 audio attention has a symbolic head dimension during `torch.compile`
-tracing. The cuDNN SDPA selector rejects that symbolic dimension and Dynamo
-aborts compilation. This is tracked in
-[issue #3121](https://github.com/vllm-project/vllm-omni/issues/3121).
-
-Use `FLASHINFER_ATTN` or `TORCH_SDPA` as a workaround:
-
-```bash
-DIFFUSION_ATTENTION_BACKEND=FLASHINFER_ATTN \
-  python examples/offline_inference/text_to_video/text_to_video.py \
-  --model Lightricks/LTX-2 ...
-```
-
-## `FLASHINFER_ATTN`
-
-`FLASHINFER_ATTN` uses FlashInfer's batch-prefill wrapper. It is an explicit
-option on CUDA platforms and an automatic Blackwell fallback when FlashInfer
-is installed but cuDNN is too old for `CUDNN_ATTN`.
-
-```bash
-vllm-omni serve <model> --diffusion-attention-backend FLASHINFER_ATTN
-```
-
-### FlashInfer quantized attention
-
-The backend accepts an `AttentionSpec.quant` block. For QK16/V8, keep Q and K
-in FP16 or BF16 and use FP8 E4M3 for V:
-
-```python
-from vllm_omni.diffusion.data import (
-    AttentionConfig,
-    AttentionSpec,
-    AttnQuantSpec,
-    OmniDiffusionConfig,
-)
-
-config = OmniDiffusionConfig(
-    diffusion_attention_config=AttentionConfig(
-        default=AttentionSpec(
-            backend="FLASHINFER_ATTN",
-            quant=AttnQuantSpec(
-                dtype_qk="bfloat16",
-                dtype_vo="fp8_e4m3",
-            ),
-        ),
-    ),
-    ...,
-)
-```
-
-`dtype_qk` controls Q and K; `dtype_vo` controls V. Mixed-dtype
-configurations require FlashInfer 0.6.16rc1 or newer. The shared quantization
-schema is also consumed by TRTLLM, but each backend validates its own allowed
-fields and values; see [TRTLLM SAGE quantization](trtllm.md#sage-quantization).
@@ -1,32 +0,0 @@
-# Hugging Face Hub Attention Backends
-
-Hub backends load the same published kernels commonly used with Hugging Face
-Diffusers. They are useful when training and serving must use matching kernel
-implementations to reduce numerical drift and sampling divergence.
-
-| Backend | Kernel | Platform |
-| --- | --- | --- |
-| `FLASH_ATTN_HUB` | `kernels-community/flash-attn2` | Compatible CUDA GPUs |
-| `FLASH_ATTN_3_HUB` | `kernels-community/flash-attn3` | Hopper sm_90 or newer |
-
-## Installation
-
-```bash
-pip install kernels==0.14.1
-```
-
-If `kernels` is unavailable, vLLM-Omni warns and falls back to the
-corresponding local FlashAttention implementation. On CUDA devices older than
-Hopper, `FLASH_ATTN_3_HUB` falls back to `FLASH_ATTN_HUB`.
-
-## Usage
-
-```bash
-export DIFFUSION_ATTENTION_BACKEND=FLASH_ATTN_HUB
-
-# Equivalent CLI selection
-vllm-omni serve <model> --diffusion-attention-backend FLASH_ATTN_HUB
-```
-
-For per-role kernel alignment, configure the Hub backend on only the relevant
-role; see the [attention backend overview](../attention_backends.md#per-role-configuration).
@@ -1,72 +0,0 @@
-# RainFusion Attention
-
-`RAINFUSION_ATTN` runs MindIE-SD RainFusion (`rf_v2`) block-sparse video
-attention on Ascend NPU. It pools 128-token key blocks, ranks them per query
-block, and attends to the highest-scoring blocks after arranging video tokens
-in `(t, h, w)` order.
-
-Only the video segment is sparse. Prefix rows such as text, visual conditions,
-and audio, plus first-frame blocks, remain dense. Unsupported calls—including
-warmup steps, skipped layers, missing video geometry, and video segments below
-32 blocks—delegate to `FLASH_ATTN`, so compatible models can select RainFusion
-globally.
-
-## Configuration
-
-| Key | Valid values | Meaning |
-| --- | --- | --- |
-| `sparsity` | finite, `[0, 1]` | Nominal dropped-key-block fraction; default `0.8`; `0` disables sparsity |
-| `start_step` | integer, `>= 0` | Number of early denoise steps kept dense |
-| `skip_layers` | selector such as `"0-3,38"` | DiT blocks kept dense |
-
-```bash
-vllm-omni serve MiniMaxAI/MiniMax-H3 \
-  --diffusion-attention-config '{"default":{"backend":"RAINFUSION_ATTN",\
-    "block_sparse":{"sparsity":0.8,"start_step":0}}}'
-```
-
-```python
-from vllm_omni.diffusion.data import AttentionConfig, AttentionSpec, BlockSparseSpec
-
-config = AttentionConfig(
-    default=AttentionSpec(
-        backend="RAINFUSION_ATTN",
-        block_sparse=BlockSparseSpec(
-            sparsity=0.8,
-            start_step=0,
-            skip_layers="0-1",
-        ),
-    ),
-)
-```
-
-Tune `start_step`, then `sparsity`, then `skip_layers`. Increasing the dense
-early-step window is usually the cheapest way to recover global structure;
-use layer exclusions only after a same-seed dense comparison identifies
-sensitive blocks.
-
-## Requirements and compatibility
-
-RainFusion requires Ascend NPU and `mindiesd`. Selecting it on another
-platform raises. It is incompatible with ring sequence parallelism because
-the kernel needs the complete key sequence for ranking; use Ulysses sequence
-parallelism with `ring_degree=1`.
-
-## Geometry handling
-
-RainFusion handles arbitrary video grids by rearranging video spatially and,
-when necessary, promoting a real-video suffix to the always-kept prefix. It
-does not pad because `rf_v2` does not consume a padding attention mask.
-
-For MiniMax-H3 at 1344x768, grid `(62, 24, 42)` produces 62,496 video rows.
-The implementation promotes 2,976 rows and leaves 59,520 sparse rows
-(`465 x 128`) so the mask and kernel tiling remain aligned.
-
-Spatial grids aligned to 8x8 are still preferable. A latent height or width
-not divisible by 8 creates an always-kept suffix and reduces realized
-sparsity. At the image level, that means width and height divisible by 256.
-Protected video tails require a compatible MindIE-SD release.
-
-For common configuration and selector behavior, see the
-[attention backend overview](../attention_backends.md) and the
-[backend selection design](../../../design/feature/attention_backend_selection.md).
@@ -1,63 +0,0 @@
-# SageAttention
-
-SageAttention backends provide lossy low-precision attention for diffusion
-models. Validate output quality against `TORCH_SDPA` at the same seed before
-using either backend in production.
-
-## `SAGE_ATTN`
-
-`SAGE_ATTN` uses SageAttention 2.2 with INT8-quantized attention and FP16
-accumulation.
-
-### Installation
-
-Install SageAttention into the same environment as vLLM-Omni:
-
-```bash
-git clone https://github.com/thu-ml/SageAttention.git
-cd SageAttention
-export EXT_PARALLEL=4 NVCC_APPEND_FLAGS="--threads 8" MAX_JOBS=32
-pip install . --no-build-isolation
-```
-
-Verify the installation:
-
-```bash
-python -c "import sageattention; print(sageattention.__file__)"
-```
-
-Select it globally:
-
-```bash
-vllm-omni serve <model> --diffusion-attention-backend SAGE_ATTN
-```
-
-## `SAGE_ATTN_3`
-
-`SAGE_ATTN_3` uses the SageAttention3 Blackwell implementation.
-
-### SageAttention3 installation
-
-```bash
-git clone https://github.com/thu-ml/SageAttention.git
-cd SageAttention/sageattention3_blackwell
-python setup.py install
-```
-
-Verify the installation:
-
-```bash
-python -c "import sageattn3; print(sageattn3.__file__)"
-```
-
-```bash
-vllm-omni serve <model> --diffusion-attention-backend SAGE_ATTN_3
-```
-
-`SAGE_ATTN_3` requires CUDA, an importable `sageattn3`, and a Blackwell-class
-GPU. Its kernel assumes the query-head count equals the key/value-head count.
-GQA and MQA diffusion calls therefore fall back to PyTorch SDPA for
-correctness.
-
-For common configuration and platform routing, see the
-[attention backend overview](../attention_backends.md).
@@ -1,103 +0,0 @@
-# TRTLLM Attention
-
-`TRTLLM_ATTN` runs FlashInfer's trtllm-gen FMHA kernels. It supports dense
-BF16 attention plus optional Skip-Softmax sparsity or SAGE quantization.
-
-For common selection and per-role configuration, see the
-[attention backend overview](../attention_backends.md).
-
-## Requirements
-
-Selecting `TRTLLM_ATTN` requires:
-
- datacenter Blackwell, sm_100 or sm_103;
- `head_dim=128`;
- FlashInfer; and
- a model-declared packed or mask-free compatible path.
-
-It is not supported on workstation Blackwell (sm_120/sm_121). An incompatible
-explicit selection raises instead of silently changing the backend.
-
-## Dense mode
-
-Select `TRTLLM_ATTN` without `skip_softmax` or `quant` to run dense BF16:
-
-```bash
-vllm-omni serve <model> --diffusion-attention-backend TRTLLM_ATTN
-```
-
-## Skip-Softmax
-
-Skip-Softmax trades some fidelity for speed by skipping low-contribution
-attention work. See the [feature design](../../../design/feature/skip_softmax.md)
-for the algorithm and implementation contract.
-
-| Key | Valid values | Meaning |
-| --- | --- | --- |
-| `target_sparsity` | finite, `[0, 1]` | Point on a model-calibrated curve |
-| `threshold` | finite, `>= 0` | Direct threshold; mutually exclusive with `target_sparsity` |
-| `disabled_until_timestep` | finite, `[0, 1]` | Keep early high-noise steps dense until normalized `t <= D` |
-
-```bash
-vllm-omni serve Wan-AI/Wan2.2-T2V-A14B-Diffusers \
-  --diffusion-attention-config '{"default":{"backend":"TRTLLM_ATTN",\
-    "skip_softmax":{"target_sparsity":0.65,"disabled_until_timestep":0.86}}}'
-```
-
-```python
-from vllm_omni.diffusion.data import AttentionConfig, AttentionSpec, SkipSoftmaxSpec
-
-config = AttentionConfig(
-    default=AttentionSpec(
-        backend="TRTLLM_ATTN",
-        skip_softmax=SkipSoftmaxSpec(
-            target_sparsity=0.65,
-            disabled_until_timestep=0.86,
-        ),
-    ),
-)
-```
-
-Start with `target_sparsity=0.65` and `disabled_until_timestep=0.86`. Increase
-sparsity only after comparing quality against dense output at the same seed.
-The benefit grows with sequence length because only attention is accelerated.
-
-## SAGE quantization
-
-TRTLLM SAGE quantizes Q/K per block and V per channel so both attention
-matrix multiplications use low precision.
-
-| Key | Valid values | Meaning |
-| --- | --- | --- |
-| `dtype_qk` | `int8`, `fp8_e4m3` | Q/K quantization dtype; absent means dense |
-| `q_block_size` | `1`, `4`, `16` | Q scale block size; default `1` |
-| `k_block_size` | `1`, `4`, `16` | K scale block size; default `16` |
-
-V is always quantized per channel to FP8 E4M3 and K-smoothing is internal.
-Only block sizes with compiled kernels are accepted.
-
-```bash
-vllm-omni serve Wan-AI/Wan2.2-T2V-A14B-Diffusers \
-  --diffusion-attention-config '{"default":{"backend":"TRTLLM_ATTN",\
-    "quant":{"dtype_qk":"fp8_e4m3","q_block_size":1,"k_block_size":16}}}'
-```
-
-```python
-from vllm_omni.diffusion.data import AttentionConfig, AttentionSpec, AttnQuantSpec
-
-config = AttentionConfig(
-    default=AttentionSpec(
-        backend="TRTLLM_ATTN",
-        quant=AttnQuantSpec(
-            dtype_qk="fp8_e4m3",
-            q_block_size=1,
-            k_block_size=16,
-        ),
-    ),
-)
-```
-
-This path requires FlashInfer 0.6.16rc1 or newer. FP8 Q/K kernels are
-available on sm_100 and sm_103; INT8 Q/K kernels are compiled for sm_100 only.
-The shared `AttnQuantSpec` is backend typed: values intended for
-`FLASHINFER_ATTN` are rejected here and vice versa.
@@ -1,75 +1,389 @@
 # CPU Offloading for Diffusion Models

-vLLM-Omni provides three CPU-offload strategies for diffusion models. Choose
-the coarsest strategy that meets your memory target: finer-grained streaming
-saves more device memory but adds more transfer and setup overhead.
+## Overview

-For the shared factory, discovery, and lifecycle contract, see the
-[CPU Offloading design](../../design/feature/offloader/README.md).
+vLLM-Omni provides two offloading strategies to reduce GPU memory usage for diffusion models:

-## Choose a strategy
+1. **Model-level (Sequential) Offloading**: Mutual exclusion between DiT model and encoder - only one is on GPU at a time.
+2. **Layerwise (Blockwise) Offloading**: Keeps only one transformer block on GPU at a time with compute-memory overlap.

-| Strategy | Device residency | Parallel scope | Guide |
-| --- | --- | --- | --- |
-| Model-level (sequential) | One pipeline component group at a time | Single device | [Model-Level Offloading](offloader/cpu_offload.md) |
-| Layerwise (blockwise) | One transformer block, with next-block prefetch | Single device | [Layerwise Offloading](offloader/layerwise_offload.md) |
-| Distributed layerwise | Fixed two-block device buffer; optional host-weight sharding and AllGather | Multiple GPU/NPU ranks | [Distributed Layerwise Offloading](offloader/distributed_layerwise_offload.md) |
+Both strategies use pinned memory for faster CPU-GPU transfers. The strategies are **mutually exclusive** for now - if both are enabled, layerwise takes priority.

-All strategies use pinned host memory for faster transfers where applicable.
-Configuration priority is:
-
-1. Distributed layerwise offloading.
-2. Layerwise offloading.
-3. Model-level offloading.
-
-Treat the flags as mutually exclusive. If more than one is enabled, the
-higher-priority strategy is selected.
-
-## Quick selection
-
- Use [model-level offloading](offloader/cpu_offload.md) when swapping whole
-  encoders and DiTs is enough to fit and phase-boundary transfers are
-  acceptable.
- Use [layerwise offloading](offloader/layerwise_offload.md) for compute-heavy video
-  DiTs where block transfers can overlap computation.
- Use [distributed layerwise offloading](offloader/distributed_layerwise_offload.md)
-  when a multi-rank deployment also needs bounded device residency and,
-  optionally, sharded host weights.
-
-## Supported models
-
-| Architecture | Example models | DiT class | Model-level | Layerwise | Distributed layerwise | Layerwise block attributes |
-| --- | --- | --- | :---: | :---: | :---: | --- |
-| Flux2Pipeline | `black-forest-labs/FLUX.2-dev` | `Flux2Transformer2DModel` | yes | yes | — | `transformer_blocks`, `single_transformer_blocks` |
-| LongCatImagePipeline | `meituan-longcat/LongCat-Image` | `LongCatImageTransformer2DModel` | — | yes | — | `transformer_blocks`, `single_transformer_blocks` |
-| NextStep11Pipeline | `stepfun-ai/NextStep-1.1` | `NextStepModel` | — | yes | — | `layers` |
-| OvisImagePipeline | `AIDC-AI/Ovis-Image-7B` | `OvisImageTransformer2DModel` | — | yes | — | `transformer` |
-| QwenImagePipeline | `Qwen/Qwen-Image` | `QwenImageTransformer2DModel` | yes | yes | — | `transformer_blocks` |
-| StableDiffusionXLPipeline | `stabilityai/stable-diffusion-xl-base-1.0` | `SDXLUNet2DConditionModel` | yes | yes | — | `down_blocks`, `up_blocks` |
-| StableDiffusion3Pipeline | `stabilityai/stable-diffusion-3.5-medium` | `SD3Transformer2DModel` | — | yes | — | `transformer_blocks` |
-| Wan22I2VPipeline | `Wan-AI/Wan2.2-I2V-A14B-Diffusers` | `WanTransformer3DModel` | yes | yes | — | `blocks` |
-| Wan22Pipeline | `Wan-AI/Wan2.2-T2V-A14B-Diffusers` | `WanTransformer3DModel` | yes | yes | — | `blocks` |
-| SoulXSingerPipeline / SoulXSingerSVCPipeline | `Soul-AILab/SoulX-Singer` | `DiffLlama` | yes | yes | — | `layers` |
-| BagelPipeline | `ByteDance-Seed/BAGEL-7B-MoT` | `Qwen2MoTModel` | — | yes | — | `layers`, customized modules |
-| Cosmos3OmniDiffusersPipeline | `nvidia/Cosmos3-Nano`, `nvidia/Cosmos3-Super` | `Cosmos3VFMTransformer`, `Cosmos3LanguageModel` | yes | yes | yes | `layers`, `gen_layers` |
-
-Model-level support requires discoverable DiT and encoder components.
-Layerwise support requires transformer block topology. Distributed support
-reuses that topology but still requires validation for the model, checkpoint,
-and parallel configuration.
-
-## Compatibility anchors
-
-These headings preserve links to sections that moved into dedicated guides.

 ## Model-level (Sequential) Offloading

-See [Model-Level Offloading](offloader/cpu_offload.md).
+### How It Works
+
+Model-level offloading implements mutual exclusion between DiT transformer and encoder modules using pre forward hooks:
+
+- **When encoders run**: DiT transformer is offloaded to CPU
+- **When DiT runs**: Encoders are offloaded to CPU, if more than one dit models, only one loaded on GPU, others get offloaded to CPU.
+- **VAE**: Stays resident on GPU
+
+Before each module's forward pass, the hook automatically moves it to GPU while offloading the other module group to CPU. Transfers use pinned memory for speed.
+
+### Usage
+
+**Python API:**
+```python
+from vllm_omni import Omni
+
+m = Omni(model="Wan-AI/Wan2.2-T2V-A14B-Diffusers", enable_cpu_offload=True)
+```
+
+**CLI:**
+```bash
+vllm serve Wan-AI/Wan2.2-T2V-A14B-Diffusers --omni --enable-cpu-offload
+```
+
+### To Support a Model
+
+Implement the `SupportsComponentDiscovery` protocol to declare which
+submodules serve as pipeline components (used by offloading, HSDP
+sharding, and other framework features):
+
+```python
+from typing import ClassVar
+from vllm_omni.diffusion.models.interface import SupportsComponentDiscovery
+
+class MyPipeline(nn.Module, SupportsComponentDiscovery):
+    _dit_modules: ClassVar[list[str]] = ["transformer"]
+    _encoder_modules: ClassVar[list[str]] = ["text_encoder", "vision_model"]
+    _vae_modules: ClassVar[list[str]] = ["vae"]
+    _resident_modules: ClassVar[list[str]] = []  # optional
+
+    def __init__(self):
+        super().__init__()
+        self.transformer = ...     # DiT — stays on GPU during denoising
+        self.text_encoder = ...    # Encoder — offloaded to CPU during denoising
+        self.vision_model = ...    # Encoder — offloaded to CPU during denoising
+        self.vae = ...             # VAE — always on GPU
+```
+
+- `_dit_modules`: attribute names of denoising submodules (kept on GPU
+  during the diffusion loop).
+- `_encoder_modules`: attribute names of encoder/vision submodules
+  (offloaded to CPU during the diffusion loop).
+- `_vae_modules`: attribute names of VAE(s) (always kept on GPU, not
+  part of the mutual exclusion hooks).
+- `_resident_modules`: attribute names of small submodules that must
+  stay on GPU during layerwise offloading (e.g. embedders, connectors).
+  Optional — defaults to `[]`.
+
+All attribute names support dotted paths for nested submodules
+(e.g. `"pipe.transformer"`, `"bagel.time_embedder"`).
+
+Both DiT and encoder lists are needed because the offload hooks use
+mutual exclusion: when one group runs, the other moves to CPU.
+
+### Limitations
+- Cold start latency increases
+- Adds overhead from CPU-GPU transfers between encoder and denoising phases
+- Support single GPU only for now
+
+
+### Component offloading for split models (e.g. Cosmos3)
+
+Some models split their transformer into mutually-exclusive *components* that run
+in different phases of a single forward pass rather than as separate pipeline
+components -- e.g. Cosmos3's understanding (reasoner) component runs once per
+generation while the generation (generator) component runs every denoising step.
+Such models have no separate text encoder to swap against, so the transformer
+owns a small model-local offload path and wraps each phase with
+`with self._offload_context(name):`
+
+```python
+class Cosmos3VFMTransformer(nn.Module):
+    def forward(self, ...):
+        with self._offload_context("reasoner"):
+            ...  # understanding pass, runs once
+        with self._offload_context("generator"):
+            ...  # denoising pass, runs every step
+```
+
+Model-level offloading then keeps exactly one component GPU-resident at a time
+(the other on CPU), reusing the same `SequentialOffloadHook` `.to()` movers. The
+pipeline opts in by exposing `enable_omni_model_cpu_offload` (which drives the
+transformer's `enable_model_cpu_offload` and pins the VAE). Layerwise offloading
+works for these models too -- each component declares its own block container via
+`_layerwise_offload_blocks_attrs`.
+

 ## Layerwise (Blockwise) Offloading

-See [Layerwise Offloading](offloader/layerwise_offload.md).
+### How It Works
+
+Layerwise offloading keeps only one transformer block on GPU at a time.
+
+As each block completes, the next block is prefetched to GPU while the current block is freed. The pre and forward hooks utilized by layerwise offloading apply a separate CUDA stream (`copy_stream`) to overlap weight transfer with computation, and retain flattened tensors in pinned CPU memory for block parameters re-materialization. Encoders, VAE, and non-block DiT modules (embeddings, norms) always stay on GPU.
+
+**Execution Flow:**
+
+| Block | Pre-forward Hook | Forward | Post-forward Hook |
+|-------|------------------|---------|-------------------|
+| block-0 | Prefetch block-1 (async) | Compute block-0 | Free block-0 |
+| block-1 | Prefetch block-2 (async) | Compute block-1 | Free block-1 |
+| ... | ... | ... | ... |
+| block-(n-1) | **Prefetch block-0** (async) | Compute block-(n-1) | Free block-(n-1) |
+
+Each transformer block has a `LayerwiseOffloadHook` that prefetches the next block before forward and frees the current block after forward.
+
+Layerwise offloading is primarily recommended for large **video generation models** where the compute cost per block is high enough to effectively overlap with memory prefetch operations. For example, Wan2.2 T2V and I2V pipelines.
+
+### Usage
+
+**Python API:**
+```python
+from vllm_omni import Omni
+
+# Text-to-video
+m = Omni(model="Wan-AI/Wan2.2-T2V-A14B-Diffusers", enable_layerwise_offload=True)
+
+# Or image-to-video
+m = Omni(model="Wan-AI/Wan2.2-I2V-A14B-Diffusers", enable_layerwise_offload=True)
+```
+
+**CLI:**
+```bash
+# Text-to-video
+vllm serve Wan-AI/Wan2.2-T2V-A14B-Diffusers --omni --enable-layerwise-offload
+
+# Or image-to-video
+vllm serve Wan-AI/Wan2.2-I2V-A14B-Diffusers --omni --enable-layerwise-offload
+```
+
+### To Support a Model
+
+Models must define the blocks attribute name for layerwise offloading:
+
+```python
+class WanTransformer3DModel(nn.Module):
+    _layerwise_offload_blocks_attrs = ["blocks"]  # Attribute names containing transformer blocks
+
+    def __init__(self):
+        self.blocks = nn.ModuleList([...])  # Transformer blocks
+```
+
+For models with multiple block types:
+
+```python
+class Flux2Transformer2DModel(nn.Module):
+    _layerwise_offload_blocks_attrs = ["transformer_blocks", "single_transformer_blocks"]
+```
+
+### Limitations
+- Cold start latency increases because offloaded components must be moved to CPU
+  during setup; layerwise offload may add extra weight consolidation and pinning
+  work.
+- Performance depends on compute cost and H2D bandwidth as well
+- Support single GPU only for now
+

 ## Distributed Layerwise Offloading

-See [Distributed Layerwise Offloading](offloader/distributed_layerwise_offload.md).
+### How It Works
+
+Distributed layerwise offloading extends single-GPU layerwise offloading to
+multi-device deployments. In the default mode, each rank stores only
+**1/dp_size** of the model weights in host memory; full layer weights are
+reconstructed at runtime via **AllGather** on a dedicated communication stream,
+overlapped with computation via a fixed double-buffer scheme. The
+`--dlo-no-use-allgather` mode instead streams standard-loader rank-local
+weights independently and does not shard weights across ranks.
+
+For the implementation design and compatibility matrix, see
+[Distributed Layerwise Offload](../../design/feature/distributed_layerwise_offload.md).
+
+**Key features:**
+- **Weight sharding + AllGather**: each rank stores 1/dp_size of weights,
+  reconstructed per-layer via `all_gather_into_tensor`
+- **Fixed double-buffer**: exactly 2 transformer blocks on each device at any
+  time, regardless of model size
+- **DP multi-concurrency**: N concurrent requests processed in parallel
+  (AllGather only gathers weight shards, which are request-independent)
+- **mmap weight loading**: weights loaded as mmap views pointing to shared OS
+  page cache, eliminating O(dp_size × model_size) RSS during model creation
+- **Platform-agnostic**: works on NVIDIA GPU (CUDA/NCCL) and Ascend NPU
+  (CANN/HCCL) via vLLM-Omni's platform abstraction
+
+**Execution Flow (per device):**
+
+```
+Compute Stream:  [Layer N]          [Layer N+1]          [Layer N+2]
+H2D Stream:      [H2D Shard N+1]   [H2D Shard N+2]
+AllGather:       [AG N+1]          [AG N+2]
+Slot Usage:      Slot0: Layer N    Slot1: Layer N+1
+```
+
+### Usage
+
+**CLI:**
+```bash
+# 4× GPU/NPU with AllGather (recommended)
+vllm serve /path/to/model --omni \
+  --enable-distributed-layerwise-offload \
+  --data-parallel-size 4
+
+# Without DLO AllGather (each rank streams standard-loader rank-local weights)
+vllm serve /path/to/model --omni \
+  --enable-distributed-layerwise-offload \
+  --data-parallel-size 4 \
+  --dlo-no-use-allgather
+
+# With SP instead of DP (long sequences)
+vllm serve /path/to/model --omni \
+  --enable-distributed-layerwise-offload \
+  --usp 4
+```
+
+**Python API:**
+```python
+from vllm_omni import Omni
+
+m = Omni(
+    model="/path/to/model",
+    enable_distributed_layerwise_offload=True,
+    dlo_use_allgather=True,  # default
+)
+```
+
+### CLI Flags
+
+| Flag | Description | Default |
+|------|-------------|---------|
+| `--enable-distributed-layerwise-offload` | Enable DLO | `false` |
+| `--data-parallel-size N` | Number of DP ranks; DLO weight-sharding group when AllGather is enabled | `1` |
+| `--dlo-use-allgather` | Shard + AllGather (saves CPU, requires concurrent requests) | `true` |
+| `--dlo-no-use-allgather` | Use standard-loader rank-local weights; no DLO sharding or AllGather | `false` |
+
+### How model weights are loaded (mmap path)
+
+When DLO + AllGather is active, the offloader:
+
+1. **Saves non-persistent buffers** (e.g. RoPE `inv_freq`, timestep `freqs`)
+   from the normally-created transformer
+2. **Converts to meta device** via `to_empty(device="meta")`, releasing random
+   initialization weights
+3. **Loads checkpoint weights as mmap views** via `safe_open().get_tensor()`,
+   which return views into the OS page cache (shared across all ranks, 0 RSS)
+4. **Calls `post_load_weights()`** to apply model-specific dtype conversions
+   (e.g. Cosmos3's `time_embedder` → FP32)
+5. **Restores non-persistent buffers** from saved copies
+
+This approach requires **zero model-specific code changes** — no pipeline or
+transformer modifications are needed.
+
+### OffloadPlan (declarative topology metadata)
+
+Models can optionally declare an `OffloadPlan` class variable to provide
+topology metadata (block attribute names, submodules to offload) without
+any offload-specific logic:
+
+```python
+from vllm_omni.diffusion.offloader import OffloadPlan
+
+class MyPipeline(nn.Module):
+    _dit_modules = ["transformer"]
+    _offload_plan = OffloadPlan(
+        block_attrs={"transformer": ("blocks",)},
+        offload_submodules={"context_encoder": "layers"},
+    )
+```
+
+When not declared, the offloader falls back to `_layerwise_offload_blocks_attrs`
+and heuristic attribute search.  This is backward-compatible — existing models
+work without any changes.
+
+### DP Multi-concurrency
+
+When `--data-parallel-size > 1` and AllGather is enabled, the scheduler batches
+up to `dp_size` requests per denoise step.  Each DP rank processes a different
+request while AllGather synchronizes only weight shards (request-independent).
+
+**Requirements for concurrent requests:**
+- `num_inference_steps` must be specified explicitly (None is not allowed)
+- All concurrent requests must have the same `num_inference_steps` value
+- These constraints exist because AllGather is a collective that requires
+  every rank to participate at each denoise step
+
+### Limitations
+- Online quantization (FP8) is incompatible with mmap loading — falls back to
+  regular loading only when the model is outside the DLO+AllGather mmap path;
+  online quantization with DLO+AllGather is rejected. Use
+  `--dlo-no-use-allgather` or disable online quantization.
+- Tensor Parallel > 1 is rejected in the DLO+AllGather mmap path because TP-aware
+  weight-loader callbacks are bypassed. The no-AllGather path retains the
+  standard TP loader and is experimental.
+- HSDP + AllGather is rejected because it would double-shard parameters. HSDP
+  with no-AllGather is accepted at configuration level, but has limited
+  end-to-end validation.
+- `num_inference_steps=None` is not allowed in DP multi-concurrency mode
+
+**Module Discovery**
+
+The offloader discovers pipeline components in two ways:
+
+1. **Protocol-based** (preferred): If the pipeline implements
+    `SupportsComponentDiscovery`, its `_dit_modules`, `_encoder_modules`,
+    `_vae_modules`, and `_resident_modules` class variables are used
+    directly.  All attribute names support dotted paths (e.g.
+    `"pipe.transformer"`, `"bagel.time_embedder"`) for nested submodules.
+
+2. **Fallback attribute scan**: Otherwise, the offloader scans for
+    well-known attribute names:
+    - **DiT modules**: `transformer`, `transformer_2`, `dit`, `sr_dit`, `language_model`, `transformer_blocks`, `model`
+    - **Encoders**: `text_encoder`, `text_encoder_2`, `text_encoder_3`, `image_encoder`
+    - **VAE**: `vae`, `audio_vae`
+
+**Hook System**
+
+Both strategies use vLLM-Omni's hook registry system (`HookRegistry` and `ModelHook`) to register pre/post forward callbacks on modules, enabling automatic swapping without modifying model code.
+
+**Backend Architecture**
+
+```
+OffloadBackend (base class)
+├── ModelLevelOffloadBackend → uses SequentialOffloadHook (.to() swap)
+│                              (delegates to a pipeline's enable_omni_model_cpu_offload
+│                               for split models like Cosmos3)
+├── LayerWiseOffloadBackend → uses LayerwiseOffloadHook
+│                          (single-GPU, full weights on host)
+└── DistributedLayerwiseOffloadBackend → uses DistributedLayerwiseOffloadHook
+                                         (multi-GPU, sharded AllGather or rank-local mode)
+```
+
+Factory function `get_offload_backend()` selects the appropriate backend based on
+configuration.
+
+For split models, `ModelLevelOffloadBackend.enable()` detects a pipeline's
+`enable_omni_model_cpu_offload` hook and delegates to it; Cosmos3 then swaps its
+reasoner/generator components inside the model forward pass.
+
+
+## Supported Models
+
+| Architecture | Example Models | DiT Class | Model-Level Offload | Layerwise Offload | Distributed Layerwise Offload | Blocks Attrs (Layerwise specific) |
+|--------------|----------------|-----------|---------------------|-------------------|-------------------------------|-----------------------------------|
+| Flux2Pipeline | `black-forest-labs/FLUX.2-dev` | `Flux2Transformer2DModel` | ✓ | ✓ | - | `"transformer_blocks"`, `"single_transformer_blocks"` |
+| LongCatImagePipeline | `meituan-longcat/LongCat-Image` | `LongCatImageTransformer2DModel` | - | ✓ | - | `"transformer_blocks"`, `"single_transformer_blocks"` |
+| NextStep11Pipeline | `stepfun-ai/NextStep-1.1` | `NextStepModel` | - | ✓ | - | `"layers"` |
+| OvisImagePipeline | `AIDC-AI/Ovis-Image-7B` | `OvisImageTransformer2DModel` | - | ✓ | - | `"transformer"` |
+| QwenImagePipeline | `Qwen/Qwen-Image` | `QwenImageTransformer2DModel` | ✓ | ✓ | - | `"transformer_blocks"` |
+| StableDiffusionXLPipeline | `stabilityai/stable-diffusion-xl-base-1.0` | `SDXLUNet2DConditionModel` | ✓ | ✓ | - | `"down_blocks"`, `"up_blocks"` |
+| StableDiffusion3Pipeline | `stabilityai/stable-diffusion-3.5-medium` | `SD3Transformer2DModel` | - | ✓ | - | `"transformer_blocks"` |
+| Wan22I2VPipeline | `Wan-AI/Wan2.2-I2V-A14B-Diffusers` | `WanTransformer3DModel` | ✓ | ✓ | - | `"blocks"` |
+| Wan22Pipeline | `Wan-AI/Wan2.2-T2V-A14B-Diffusers` | `WanTransformer3DModel` | ✓ | ✓ | - | `"blocks"` |
+| SoulXSingerPipeline / SoulXSingerSVCPipeline | `Soul-AILab/SoulX-Singer` | `DiffLlama` (`cfm_decoder.model.diff_estimator`) | ✓ | ✓ | - | `"layers"` |
+| BagelPipeline | `ByteDance-Seed/BAGEL-7B-MoT` | `Qwen2MoTModel` | - | ✓ | - | `"layers"`, `"customized modules"` |
+| Cosmos3OmniDiffusersPipeline | `nvidia/Cosmos3-Nano`, `nvidia/Cosmos3-Super` | `Cosmos3VFMTransformer`, `Cosmos3LanguageModel` | ✓ | ✓ | ✓ | `"layers"`, `"gen_layers"` |
+
+**Notes:**
+- Model-Level Offloading is expected to be supported by all common diffusion models (DiT and encoders) naturally
+- Layerwise Offloading requires DiT class to define `_layerwise_offload_blocks_attrs` pointing to transformer blocks
+- Distributed Layerwise Offloading reuses the layerwise block topology, but the
+  model and parallelism combination still needs validation. AllGather mode
+  additionally requires a compatible checkpoint/mmap layout; no-AllGather mode
+  retains the standard loader's rank-local tensors. See the
+  [DLO design](../../design/feature/distributed_layerwise_offload.md) and
+  [Cosmos3 DistOffload recipe](https://github.com/vllm-project/vllm-omni/blob/main/recipes/cosmos3/Cosmos3-DistOffload.md)
+  for usage examples.
@@ -1,81 +0,0 @@
-# Model-Level Offloading
-
-Model-level, or sequential, offloading keeps only the pipeline component group
-currently executing on the accelerator. It is the simplest offload strategy
-and is selected with `--enable-cpu-offload`.
-
-## How it works
-
-Pre-forward hooks enforce mutual exclusion between DiT and encoder modules:
-
- before an encoder runs, the DiT moves to CPU;
- before a DiT runs, encoders and other DiTs move to CPU; and
- VAE modules remain on the accelerator.
-
-Pinned host memory reduces transfer overhead. Transfers occur at phase
-boundaries, so cold-start and encoder-to-denoiser transitions become slower.
-
-## Usage
-
-```python
-from vllm_omni import Omni
-
-omni = Omni(
-    model="Wan-AI/Wan2.2-T2V-A14B-Diffusers",
-    enable_cpu_offload=True,
-)
-```
-
-```bash
-vllm serve Wan-AI/Wan2.2-T2V-A14B-Diffusers \
-  --omni --enable-cpu-offload
-```
-
-## Model integration
-
-Pipelines should implement `SupportsComponentDiscovery`:
-
-```python
-from typing import ClassVar
-
-from vllm_omni.diffusion.models.interface import SupportsComponentDiscovery
-
-
-class MyPipeline(nn.Module, SupportsComponentDiscovery):
-    _dit_modules: ClassVar[list[str]] = ["transformer"]
-    _encoder_modules: ClassVar[list[str]] = ["text_encoder", "vision_model"]
-    _vae_modules: ClassVar[list[str]] = ["vae"]
-    _resident_modules: ClassVar[list[str]] = []
-```
-
-All entries may be dotted paths. DiT and encoder lists are both required for
-mutual exclusion. VAE modules are pinned but not swapped; resident modules are
-small modules that must stay on the accelerator for layerwise paths.
-
-## Split-model components
-
-Some models, such as Cosmos3, split one transformer into mutually exclusive
-components that run in different phases. The pipeline exposes
-`enable_omni_model_cpu_offload`, and the backend delegates to the model-local
-contexts:
-
-```python
-class Cosmos3VFMTransformer(nn.Module):
-    def forward(self, ...):
-        with self._offload_context("reasoner"):
-            ...
-        with self._offload_context("generator"):
-            ...
-```
-
-This preserves the same invariant—exactly one component is device resident—
-while reusing sequential `.to()` movers.
-
-## Limitations
-
- Single device only.
- Higher cold-start latency.
- Transfers between encoder and denoising phases add latency.
-
-See the [model-level design](../../../design/feature/offloader/cpu_offload.md)
-for lifecycle and extension invariants.
@@ -1,118 +0,0 @@
-# Distributed Layerwise Offloading
-
-Distributed layerwise offloading (DLO) extends block streaming to multi-device
-deployments. With AllGather enabled, each rank stores roughly `1 / dp_size` of
-the host weights and reconstructs each layer at runtime. Without AllGather,
-each rank streams its standard-loader rank-local weights independently.
-
-See the [DLO feature design](../../../design/feature/offloader/distributed_layerwise_offload.md)
-for the implementation contract and compatibility matrix.
-
-## Execution model
-
-DLO overlaps three operations with a fixed two-block device buffer:
-
-```text
-Compute stream:  [Layer N]          [Layer N+1]        [Layer N+2]
-H2D stream:      [H2D shard N+1]    [H2D shard N+2]
-AllGather:       [AG N+1]           [AG N+2]
-Slots:           slot 0: Layer N    slot 1: Layer N+1
-```
-
-AllGather communicates only request-independent weight shards, so data-
-parallel ranks may process different requests concurrently.
-
-## Usage
-
-```bash
-# Four ranks with sharded host weights and AllGather
-vllm serve /path/to/model --omni \
-  --enable-distributed-layerwise-offload \
-  --data-parallel-size 4
-
-# Standard-loader rank-local weights, without DLO AllGather
-vllm serve /path/to/model --omni \
-  --enable-distributed-layerwise-offload \
-  --data-parallel-size 4 \
-  --dlo-no-use-allgather
-
-# Sequence parallel deployment
-vllm serve /path/to/model --omni \
-  --enable-distributed-layerwise-offload \
-  --usp 4
-```
-
-```python
-from vllm_omni import Omni
-
-omni = Omni(
-    model="/path/to/model",
-    enable_distributed_layerwise_offload=True,
-    dlo_use_allgather=True,
-)
-```
-
-## Flags
-
-| Flag | Meaning | Default |
-| --- | --- | --- |
-| `--enable-distributed-layerwise-offload` | Enable DLO | `false` |
-| `--data-parallel-size N` | DP ranks and AllGather weight-sharding group | `1` |
-| `--dlo-use-allgather` | Shard host weights and reconstruct with AllGather | `true` |
-| `--dlo-no-use-allgather` | Keep standard-loader rank-local weights | `false` |
-| `--dlo-resident-layers N` | Keep N leading main-DiT blocks on device; requires no-AllGather and model-declared resident paths | `0` |
-
-## mmap weight loading
-
-The DLO plus AllGather path:
-
-1. saves non-persistent buffers such as RoPE frequencies;
-2. moves the normally created transformer to the meta device;
-3. loads checkpoint tensors as mmap views backed by the shared OS page cache;
-4. calls model-specific `post_load_weights()` conversions; and
-5. restores the saved non-persistent buffers.
-
-This avoids one full checkpoint RSS copy per rank and does not require
-model-specific loading code.
-
-## Declarative topology
-
-Models may declare an `OffloadPlan` instead of embedding offload logic:
-
-```python
-from vllm_omni.diffusion.offloader import OffloadPlan
-
-
-class MyPipeline(nn.Module):
-    _dit_modules = ["transformer"]
-    _offload_plan = OffloadPlan(
-        block_attrs={"transformer": ("blocks",)},
-        offload_submodules={"context_encoder": "layers"},
-    )
-```
-
-When no plan exists, discovery falls back to
-`_layerwise_offload_blocks_attrs` and then heuristic attribute lookup.
-
-## Data-parallel concurrency
-
-With `data_parallel_size > 1` and AllGather enabled, the scheduler can process
-up to `dp_size` requests per denoising step. Every concurrent request must set
-the same explicit `num_inference_steps`; `None` is rejected because every rank
-must enter each collective.
-
-## Limitations
-
- Online FP8 quantization is rejected with the DLO plus AllGather mmap path.
-  Use `--dlo-no-use-allgather` or disable online quantization.
- Tensor parallel size greater than one is rejected in the mmap path because
-  it bypasses TP-aware loader callbacks. The no-AllGather path retains the
-  standard loader and remains experimental with TP.
- HSDP plus AllGather is rejected to avoid double sharding. HSDP without
-  AllGather has limited end-to-end validation.
- Resident leading layers require `--dlo-no-use-allgather` and a model
-  `OffloadPlan` that declares eligible `resident_dit_paths`.
- DP concurrency requires an explicit, identical inference-step count.
-
-See the [Cosmos3 DistOffload recipe](https://github.com/vllm-project/vllm-omni/blob/main/recipes/cosmos3/Cosmos3-DistOffload.md)
-for an end-to-end example.
@@ -1,65 +0,0 @@
-# Layerwise Offloading
-
-Layerwise, or blockwise, offloading keeps one transformer block on the
-accelerator and prefetches the next block while the current block computes.
-It is best suited to compute-heavy video DiTs whose block execution can hide
-host-to-device transfers.
-
-## Execution flow
-
-Each block has a pre-forward and post-forward hook. Parameters are consolidated
-in pinned host tensors and rematerialized for execution on a dedicated copy
-stream.
-
-| Block | Pre-forward hook | Forward | Post-forward hook |
-| --- | --- | --- | --- |
-| block 0 | Prefetch block 1 | Compute block 0 | Free block 0 |
-| block 1 | Prefetch block 2 | Compute block 1 | Free block 1 |
-| ... | ... | ... | ... |
-| last block | Prefetch block 0 | Compute last block | Free last block |
-
-Encoders, VAE modules, and non-block DiT modules such as embeddings and norms
-remain device resident.
-
-## Usage
-
-```python
-from vllm_omni import Omni
-
-omni = Omni(
-    model="Wan-AI/Wan2.2-T2V-A14B-Diffusers",
-    enable_layerwise_offload=True,
-)
-```
-
-```bash
-vllm serve Wan-AI/Wan2.2-T2V-A14B-Diffusers \
-  --omni --enable-layerwise-offload
-```
-
-## Model integration
-
-Transformer classes declare containers of executable blocks:
-
-```python
-class WanTransformer3DModel(nn.Module):
-    _layerwise_offload_blocks_attrs = ["blocks"]
-
-
-class Flux2Transformer2DModel(nn.Module):
-    _layerwise_offload_blocks_attrs = [
-        "transformer_blocks",
-        "single_transformer_blocks",
-    ]
-```
-
-See the [layerwise design](../../../design/feature/offloader/layerwise_offload.md) for
-the discovery and hook invariants. `OffloadPlan` is a separate declarative
-topology path for distributed layerwise offload.
-
-## Limitations
-
- Single device only.
- Setup consolidates and pins block parameters, increasing cold-start time.
- Performance depends on block compute time and host-to-device bandwidth;
-  lightweight blocks may not hide transfers.
@@ -64,41 +64,6 @@ omni = Omni(
 )
 ```

-### Combined with Online FP8 Quantization
-
-HSDP can be combined with online FP8 quantization for diffusion models that
-support both features. HSDP shards the quantized weights across GPUs to reduce
-the per-GPU weight memory footprint.
-
-```python
-from vllm_omni import Omni
-from vllm_omni.diffusion.data import DiffusionParallelConfig
-
-omni = Omni(
-    model="<your-model>",
-    quantization="fp8",
-    parallel_config=DiffusionParallelConfig(
-        use_hsdp=True,
-        hsdp_shard_size=2,
-    ),
-)
-```
-
-For online serving:
-
-```bash
-vllm serve <your-model> \
-    --omni \
-    --quantization fp8 \
-    --use-hsdp \
-    --hsdp-shard-size 2
-```
-
-The model must support both HSDP and online FP8 quantization. HSDP remains
-incompatible with Tensor Parallelism. See the
-[FP8 Quantization Guide](../../quantization/fp8.md) for supported models and
-hardware.
-
 ---

 ## Example Script
@@ -182,4 +147,3 @@ For detailed instructions on adding HSDP support to new models, see the [HSDP Co
 1. ✅ **Enable HSDP** - Set `use_hsdp=True` and `hsdp_shard_size` to reduce per-GPU memory for large models
 2. ✅ **Combine with SP** - Use together with `ulysses_degree` for video models requiring both memory reduction and sequence parallelism
 3. ⚠️ **Incompatible with TP** - `tensor_parallel_size` must be 1 when HSDP is enabled
-4. ✅ **Combine with online FP8** - Use `quantization="fp8"` or `--quantization fp8` to reduce the sharded weight memory footprint
@@ -106,10 +106,7 @@ The following tables show which models support each feature:

 > Notes:

-> 1. CPU Offload has three strategies: model-level, layerwise, and distributed
->    layerwise. The tables below show **layerwise support** only. Split models
->    like Cosmos3 swap their reasoner/generator components for model-level
->    offload; see the [CPU Offload Guide](diffusion/cpu_offload.md).
+> 1. CPU Offload has two methods: Module-wise (default for models with DiT + text encoder) and Layerwise. The tables below show **Layerwise support** only. Split models like Cosmos3 (no separate text encoder) swap their reasoner/generator components for module-wise offload; see the [CPU Offload Guide](diffusion/cpu_offload.md).
 > 2. The **💾Quantization** column is collapsed for readability. See [Quantization](quantization/overview.md) for per-method and per-model support details.

 ### ImageGen
@@ -217,7 +214,7 @@ The following tables show which models support each feature:
    3. CPU Offloading (Layerwise) and CPU Offloading (Module-wise) are not compatible.
    4. The CPU Offloading (Layerwise) row describes local layerwise offload.
       Multi-device Distributed Layerwise Offload has a separate topology and
-       compatibility matrix in the [Distributed Layerwise Offloading guide](diffusion/offloader/distributed_layerwise_offload.md).
+       compatibility matrix in the [CPU Offloading guide](diffusion/cpu_offload.md#distributed-layerwise-offloading).
    5. The compatibility matrix uses FP8 as the representative quantization method.
    6. Step Execution is not compatible with any diffusion cache backend. LoRA is supported, but each scheduled batch must use a single adapter (requests with different `lora_request` or `lora_scale` are kept in separate batches).

@@ -12,7 +12,6 @@ For backend selection and SageAttention usage, see the [Diffusion Attention Back
 | Model | Default Resolution | Default Frames | Default Steps | Guidance | VRAM (BF16) |
 |---|---|---|---|---|---|
 | `Wan-AI/Wan2.2-T2V-A14B-Diffusers` | 720x1280 | 81 | 40 | 4.0 | ~60 GiB |
-| `robbyant/lingbot-video-dense-1.3b` / `robbyant/lingbot-video-moe-30b-a3b` | 192x320 | 9 | 2 | 3.0 | ~68 GiB (MoE smoke) |
 | `Lightricks/LTX-2` | 512x768 | 121 | 40 | video 3.0 / audio 7.0 | Model-dependent |
 | `hunyuanvideo-community/HunyuanVideo-1.5-Diffusers-480p_t2v` | 480x832 | 121 | 50 | 6.0 | 1×A100 80GB |
 | `hunyuanvideo-community/HunyuanVideo-1.5-Diffusers-720p_t2v` | 720x1280 | 121 | 50 | 6.0 | FP8 + VAE tiling required |
@@ -36,25 +35,6 @@ python text_to_video.py \
  --output t2v_out.mp4
 ```

-### LingBot-Video
-
-The shared runner recognizes both official LingBot checkpoint IDs and selects
-the native `LingBotVideoPipeline` automatically:
-
-```bash
-python text_to_video.py \
-  --model robbyant/lingbot-video-dense-1.3b \
-  --prompt "a robotic arm picks up a red block" \
-  --height 192 --width 320 --num-frames 9 --num-inference-steps 2 \
-  --guidance-scale 3.0 --flow-shift 3.0 --fps 24 \
-  --output lingbot_t2v.mp4
-```
-
-Use `robbyant/lingbot-video-moe-30b-a3b` for the MoE checkpoint. For local
-paths without `lingbot` in the directory name, add
-`--model-class-name LingBotVideoPipeline`. Model-only options use
-`--extra-body`, for example `'{"batch_cfg": true, "output_type": "np"}'`.
-
 ### LTX-2

 ```bash
@@ -165,7 +165,7 @@ vllm serve Qwen/Qwen-Image --omni --port 8091 \

 - **Tensor Parallelism — Text Encoder Not Sharded**: TP currently only shards the DiT blocks. Each TP rank retains a **full copy of the text encoder weights**, leading to significant GPU memory overhead proportional to TP degree. Tracked in [Issue #771](https://github.com/vllm-project/vllm-omni/issues/771).

- **CPU Offloading — Strategies Are Mutually Exclusive**: Distributed layerwise, layerwise, and model-level offload should not be enabled together. Selection priority is distributed layerwise, then layerwise, then model-level.
+- **CPU Offloading — Two Modes Are Mutually Exclusive**: Model-level offload (`enable_cpu_offload`) and layerwise offload (`enable_layerwise_offload`) cannot be used simultaneously. If both are set, layerwise takes priority and model-level is silently ignored.

 - **CPU Offloading — VAE stays on GPU**: Both offloading strategies keep the VAE on GPU at all times. For high-resolution generation, VAE decode can still cause OOM. Mitigate by combining with `vae_use_tiling=True` or VAE Patch Parallelism.

@@ -80,14 +80,12 @@ warmup_quack_fp8([(14040, 2048, 6144), (14040, 2048, 2048)])

 ## Model Type Support

-### Diffusion Models
+### Diffusion Model (Qwen-Image, Wan2.2)

 | Model | HF models | Online | Pre-calibrated | Recommendation | `ignored_layers` | Text-Encoder quantization |
 |-------|-----------|:-------:|:------:|----------------|------------------|------------------|
 | Qwen-Image | `Qwen/Qwen-Image`, `Qwen/Qwen-Image-2512` | Yes | Yes | Skip sensitive image-stream MLPs when quality regresses | `img_mlp` | |
 | Wan2.2 | Wan2.2 diffusion pipelines | Not validated | Not validated | Validate against BF16 before documenting as supported | TBD | |
-| LTX-2 | `Lightricks/LTX-2`, `rootonchair/LTX-2-19b-distilled` | Yes | Not validated | Transformer only; use dynamic phase LoRA for ordinary two-stage | None | |
-| LTX-2.3 | `diffusers/LTX-2.3-Diffusers`, `diffusers/LTX-2.3-Distilled-Diffusers` | Yes | Not validated | Transformer only; use dynamic phase LoRA for ordinary two-stage | None | |
 | Z-Image | `Tongyi-MAI/Z-Image-Turbo` | Yes | Yes | All layers | None | ✅︎ |
 | FLUX.1 | `black-forest-labs/FLUX.1-dev`, `black-forest-labs/FLUX.1-schnell` | Yes | Yes | All layers | None | |
 | FLUX.2-dev | `black-forest-labs/FLUX.2-dev` | Yes | Not validated | All layers | None | ✅︎ |
@@ -12,20 +12,20 @@ For the internal architecture and backend extension points, see the

 | Mode | Guide | Description | Methods |
 |------|-------|-------------|---------|
-| Online quantization | [Online Quantization](online.md) | vLLM-Omni computes quantized weights and scales while loading the model. | FP8 W8A8, Int8 W8A8, BitsAndBytes W4, MXFP8 W8A8, MXFP4 W4A4 |
+| Online quantization | [Online Quantization](online.md) | vLLM-Omni computes quantized weights and scales while loading the model. | FP8 W8A8, Int8 W8A8, MXFP8 W8A8, MXFP4 W4A4 |
 | Runtime attention quantization | [Quantized KV Cache](quantized_kvcache.md) | vLLM-Omni dynamically quantizes eligible diffusion Flash Attention tensors during inference. | FP8 FA |
-| Pre-quantized checkpoints | Method-specific guides | The checkpoint or an offline quantizer provides quantized weights and scales before serving. | ModelOpt, AutoRound, msModelSlim, serialized Int8, offline MXFP8, offline MXFP4 DualScale |
+| Pre-quantized checkpoints | Method-specific guides | The checkpoint or an offline quantizer provides quantized weights and scales before serving. | ModelOpt, GGUF, AutoRound, msModelSlim, serialized Int8, offline MXFP8, offline MXFP4 DualScale |

 ## Hardware Support

-| Device | FP8 W8A8 | Int8 W8A8 | BitsAndBytes W4 | ModelOpt | MXFP8 W8A8 | MXFP4 W4A4 | AutoRound | msModelSlim |
-|--------|----------|-----------|------------------|----------|------------|------------|-----------|-------------|
-| NVIDIA Blackwell GPU (SM 100+) | ✅ | ✅ | ✅ | ✅ | ⭕ | ⭕ | ✅ | ❌ |
-| NVIDIA Ada/Hopper GPU (SM 89+) | ✅ | ✅ | ✅ | ✅ | ⭕ | ⭕ | ✅ | ❌ |
-| NVIDIA Ampere GPU (SM 80+) | ✅ | ✅ | ✅ | ⭕ | ⭕ | ⭕ | ✅ | ❌ |
-| AMD ROCm | ⭕ | ⭕ | ❌ | ⭕ | ⭕ | ✅ | ⭕ | ❌ |
-| Intel XPU | ⭕ | ⭕ | ❌ | ⭕ | ⭕ | ⭕ | ✅ | ❌ |
-| Ascend NPU | ❌ | ✅ | ❌ | ❌ | ✅ | ✅ | ❌ | ✅ |
+| Device | FP8 W8A8 | Int8 W8A8 | ModelOpt | MXFP8 W8A8 | MXFP4 W4A4 | GGUF | AutoRound | msModelSlim |
+|--------|----------|-----------|----------|------------|------------|------|-----------|-------------|
+| NVIDIA Blackwell GPU (SM 100+) | ✅ | ✅ | ✅ | ⭕ | ⭕ | ✅ | ✅ | ❌ |
+| NVIDIA Ada/Hopper GPU (SM 89+) | ✅ | ✅ | ✅ | ⭕ | ⭕ | ✅ | ✅ | ❌ |
+| NVIDIA Ampere GPU (SM 80+) | ✅ | ✅ | ⭕ | ⭕ | ⭕ | ✅ | ✅ | ❌ |
+| AMD ROCm | ⭕ | ⭕ | ⭕ | ⭕ | ✅ | ⭕ | ⭕ | ❌ |
+| Intel XPU | ⭕ | ⭕ | ⭕ | ⭕ | ⭕ | ⭕ | ✅ | ❌ |
+| Ascend NPU | ❌ | ✅ | ❌ | ✅ | ✅ | ❌ | ❌ | ✅ |

 Legend: `✅` supported, `❌` unsupported, `⭕` not verified in this
 guide. FP8 on Ampere may use a weight-only path where available.
@@ -43,10 +43,10 @@ otherwise.
 |--------|-------|------|----------------|--------|
 | FP8 W8A8 | [FP8](fp8.md) | Online W8A8 or checkpoint FP8 | Qwen-Image; Wan2.2 is not validated | Validated for Qwen-Image family and other DiT models |
 | Int8 W8A8 | [Int8](int8.md) | Online or serialized W8A8 | Qwen-Image; Wan2.2 is not validated | Validated for Qwen-Image and Z-Image |
-| BitsAndBytes W4 | [BitsAndBytes](bitsandbytes.md) | Online W4 weight-only | Z-Image-Turbo; Qwen-Image/Wan2.2 not validated | Validated for Z-Image-Turbo |
 | ModelOpt | [ModelOpt](modelopt.md) | Pre-quantized FP8 checkpoints | Qwen-Image, Z-Image, FLUX.2, HunyuanImage-3.0 | Validated for ModelOpt FP8 diffusion checkpoints |
 | MXFP8 W8A8 | [MXFP8](mxfp8.md) | Online W8A8 or offline pre-quantized | Wan2.2-T2V-A14B, I2V-A14B, TI2V-5B | Ascend NPU only; validated for Wan2.2 |
 | MXFP4 W4A4 | [MXFP4](mxfp4.md) | `mxfp4`: online single-scale only; `mxfp4_dualscale`: online or offline dual-scale (offline recommended) | Wan2.2-T2V-A14B, I2V-A14B | Ascend NPU only; validated for Wan2.2 A14B cascade models; TI2V-5B not supported; offline `mxfp4_dualscale` uses calibrated `mul_scale` for best accuracy |
+| GGUF | [GGUF](gguf.md) | Pre-quantized transformer weights | Qwen-Image | Validated where a model-specific GGUF adapter exists |
 | AutoRound | [AutoRound](autoround.md) | Pre-quantized W4A16 checkpoints | FLUX.1-dev; Qwen-Image/Wan2.2 not validated | Checkpoint-driven |
 | msModelSlim | [msModelSlim](msmodelslim.md) | Pre-quantized Ascend checkpoints | Wan2.2 recipe; HunyuanImage-3.0 inference target | Ascend/NPU path |

@@ -61,9 +61,9 @@ in BF16 unless the model guide explicitly adds support.
 |--------|-------|-------|----------------|--------|
 | ModelOpt | [ModelOpt](modelopt.md) | Thinker or language-model checkpoint config | Qwen3-Omni thinker | ModelOpt checkpoint path |
 | Int8 | [Int8](int8.md) | Not currently validated for omni/TTS stages | Qwen3-Omni, Qwen3-TTS | Not validated |
-| BitsAndBytes | [BitsAndBytes](bitsandbytes.md) | Not currently validated for omni/TTS stages | Qwen3-Omni, Qwen3-TTS | Not validated |
 | MXFP8 | [MXFP8](mxfp8.md) | Not currently validated for omni/TTS stages | Qwen3-Omni, Qwen3-TTS | Not validated |
 | MXFP4 | [MXFP4](mxfp4.md) | Not currently validated for omni/TTS stages | Qwen3-Omni, Qwen3-TTS | Not validated |
+| GGUF | [GGUF](gguf.md) | Not currently validated for omni/TTS stages | Qwen3-Omni, Qwen3-TTS | Not validated |
 | AutoRound | [AutoRound](autoround.md) | Thinker or language-model checkpoint config | Qwen2.5-Omni, Qwen3-Omni | Supported through AutoRound checkpoints |
 | msModelSlim | [msModelSlim](msmodelslim.md) | Not currently validated for omni/TTS stages | Qwen3-Omni, Qwen3-TTS | Not validated |

@@ -76,10 +76,10 @@ attached to the intended stage rather than applied globally.
 |--------|-------|-------|----------------|--------|
 | FP8 | [FP8](fp8.md) | Stage-specific DiT or transformer module | BAGEL, GLM-Image | Requires model-specific validation |
 | Int8 | [Int8](int8.md) | Stage-specific DiT or transformer module | BAGEL, GLM-Image | Requires model-specific validation |
-| BitsAndBytes | [BitsAndBytes](bitsandbytes.md) | Stage-specific transformer or DiT module | BAGEL, GLM-Image | Not validated |
 | ModelOpt | [ModelOpt](modelopt.md) | Checkpoint-defined diffusion stage | BAGEL, GLM-Image | Requires model-specific validation |
 | MXFP8 | [MXFP8](mxfp8.md) | Stage-specific DiT or transformer module | BAGEL, GLM-Image | Not validated |
 | MXFP4 | [MXFP4](mxfp4.md) | Stage-specific DiT or transformer module | BAGEL, GLM-Image | Not validated |
+| GGUF | [GGUF](gguf.md) | Stage-specific transformer weights | BAGEL, GLM-Image | No validated adapter listed |
 | AutoRound | [AutoRound](autoround.md) | Checkpoint-defined stage | BAGEL, GLM-Image | No validated checkpoint listed |
 | msModelSlim | [msModelSlim](msmodelslim.md) | Ascend-generated stage weights | GLM-Image | Requires model-specific adaptation |

@@ -106,7 +106,7 @@ config = build_quant_config({

 | Component | Default quantized? | Notes |
 |-----------|--------------------|-------|
-| Diffusion transformer | Yes | Primary target for FP8, Int8, BitsAndBytes, ModelOpt, MXFP8, MXFP4, AutoRound, and msModelSlim |
+| Diffusion transformer | Yes | Primary target for FP8, Int8, ModelOpt, MXFP8, MXFP4, GGUF, AutoRound, and msModelSlim |
 | Text encoder | No | Keep BF16 unless a method-specific guide documents support |
 | VAE | No | Keep BF16; storage-only paths are method-specific |
 | Scheduler/tokenizer | No | Loaded from the base model repository |
@@ -139,8 +139,8 @@ from vllm_omni.quantization import build_quant_config

 build_quant_config("fp8")
 build_quant_config({"method": "fp8", "activation_scheme": "static"})
-build_quant_config("bitsandbytes")
 build_quant_config("auto-round", bits=4, group_size=128)
+build_quant_config({"method": "gguf", "gguf_model": "/path/to/model.gguf"})
 build_quant_config({"transformer": {"method": "fp8"}, "vae": None})
 build_quant_config(None)
 ```
@@ -131,7 +131,7 @@ def build_sampling_params() -> list[SamplingParams]:


 def save_stage_output(stage_outputs, output_dir: str) -> None:
-    output = stage_outputs
+    output = stage_outputs.request_output
    request_id = output.request_id
    if stage_outputs.final_output_type == "text":
        text_output = output.outputs[0].text
@@ -59,7 +59,7 @@ def main(args):

    omni = Omni(
        model=args.model_name,
-        deploy_config=args.deploy_config,
+        stage_configs_path=args.stage_configs_path,
        log_stats=args.log_stats,
        stage_init_timeout=args.stage_init_timeout,
        batch_timeout=args.batch_timeout,
@@ -104,7 +104,7 @@ def main(args):
    os.makedirs(output_dir, exist_ok=True)

    for stage_outputs in omni_outputs:
-        output = stage_outputs
+        output = stage_outputs.request_output
        if stage_outputs.final_output_type == "text":
            request_id = output.request_id
            text_output = output.outputs[0].text
@@ -167,10 +167,10 @@ def parse_args():
        help="Sampling rate for audio loading (default: 16000).",
    )
    parser.add_argument(
-        "--deploy-config",
+        "--stage-configs-path",
        type=str,
        default=None,
-        help="Path to a deploy config YAML file.",
+        help="Path to stage configs YAML file.",
    )
    parser.add_argument(
        "--log-stats",
@@ -228,7 +228,7 @@ async def main():
    if not outputs:
        raise ValueError("No output produced from omni.generate()")

-    first_out = outputs[0]
+    first_out = outputs[0].request_output
    req_out: OmniRequestOutput = first_out

    # Verify trajectory data (from custom pipeline)
@@ -741,7 +741,7 @@ def make_mmu_prompt(

 def iter_mm_outputs(outputs: list[Any]):
    for omni_out in outputs:
-        req_out = omni_out
+        req_out = getattr(omni_out, "request_output", None)
        req_list = req_out if isinstance(req_out, list) else [req_out]
        for item in req_list:
            if item is None:
@@ -876,7 +876,7 @@ def parse_args(repo_root: Path) -> argparse.Namespace:
    parser.add_argument("--task", type=str, required=True, choices=TASK_CHOICES)
    parser.add_argument("--model", type=str, required=True, help="HF repo id or local model directory.")
    parser.add_argument(
-        "--deploy-config",
+        "--stage-config-path",
        type=str,
        default=str(repo_root / "vllm_omni/deploy/dynin_omni.yaml"),
        help="Path to deploy config yaml.",
@@ -1394,8 +1394,8 @@ def main() -> None:

    from vllm_omni.entrypoints.omni import Omni

-    deploy_config_path = str(Path(args.deploy_config).expanduser())
-    omni = Omni(model=model_source, deploy_config=deploy_config_path, dtype=args.dtype)
+    stage_config_path = str(Path(args.stage_config_path).expanduser())
+    omni = Omni(model=model_source, stage_configs_path=stage_config_path, dtype=args.dtype)
    sampling_params_list = [
        SamplingParams(max_tokens=int(args.max_tokens_per_stage), temperature=0.0, top_p=1.0, detokenize=False)
        for _ in range(omni.num_stages)
@@ -73,6 +73,7 @@ def parse_args():
    )
    parser.add_argument("--sys-type", type=str, default=None, help="Override system prompt type.")
    parser.add_argument("--deploy-config", type=str, default=None, help="Custom deploy YAML path.")
+    parser.add_argument("--stage-configs-path", type=str, default=None, help="Custom legacy stage config YAML path.")
    parser.add_argument(
        "--stream",
        action="store_true",
@@ -145,7 +146,13 @@ def main():
    else:
        bot_task = args.bot_task

-    deploy_config = args.deploy_config or _MODALITY_DEFAULT_DEPLOY_CONFIG[args.modality]
+    if args.deploy_config is not None and args.stage_configs_path is not None:
+        raise ValueError("--deploy-config and --stage-configs-path are mutually exclusive.")
+
+    deploy_config = args.deploy_config
+    stage_configs_path = args.stage_configs_path
+    if deploy_config is None and stage_configs_path is None:
+        deploy_config = _MODALITY_DEFAULT_DEPLOY_CONFIG[args.modality]

    omni_kwargs = {
        "model": args.model,
@@ -161,7 +168,10 @@ def main():

    if additional_config is not None:
        omni_kwargs["additional_config"] = additional_config
-    omni_kwargs["deploy_config"] = deploy_config
+    if deploy_config is not None:
+        omni_kwargs["deploy_config"] = deploy_config
+    else:
+        omni_kwargs["stage_configs_path"] = stage_configs_path

    omni = Omni(**omni_kwargs)

@@ -262,7 +272,10 @@ def main():
    print(f"  Modality: {args.modality}")
    print(f"  Prompt task: {task}")
    print(f"  Bot task: {bot_task}")
-    print(f"  Deploy config: {deploy_config}")
+    if deploy_config is not None:
+        print(f"  Deploy config: {deploy_config}")
+    else:
+        print(f"  Stage config: {stage_configs_path}")
    print(f"  Num stages: {omni.num_stages}")
    if args.modality in ("text2img", "img2img"):
        print(f"  Inference steps: {args.steps}")
@@ -290,7 +303,7 @@ def main():
    )
    img_idx = 0
    for req_output in omni_outputs:
-        ro = req_output
+        ro = getattr(req_output, "request_output", None)
        stage_id = getattr(req_output, "stage_id", None)

        # AR stage text — each CompletionOutput.text is already a delta when
@@ -621,7 +621,7 @@ def main():
        images = getattr(output, "images", None)
        if images:
            break
-        req_out = output
+        req_out = getattr(output, "request_output", None)
        images = getattr(req_out, "images", None) if req_out is not None else None
        if images:
            break
@@ -646,8 +646,8 @@ def main():
        if frames.multimodal_output and "audio" in frames.multimodal_output:
            audio = frames.multimodal_output["audio"]
            audio_sample_rate = frames.multimodal_output.get("audio_sample_rate", audio_sample_rate)
-        if frames.is_pipeline_output and frames is not None:
-            inner_output = frames
+        if frames.is_pipeline_output and frames.request_output is not None:
+            inner_output = frames.request_output
            if isinstance(inner_output, OmniRequestOutput):
                if inner_output.multimodal_output and "audio" in inner_output.multimodal_output:
                    audio = inner_output.multimodal_output["audio"]
@@ -1,117 +0,0 @@
-"""
-Offline inference example: MammothModa2 image summarization (single AR stage).
-
-Example:
-  uv run python examples/offline_inference/mammothmodal2_preview/run_mammothmoda2_image_summarize.py \
-    --model path/to/MammothModa2-Preview \
-    --deploy-config vllm_omni/deploy/mammoth_moda2_ar.yaml \
-    --image /path/to/input.jpg \
-    --question "Please summarize the content of this image."
-"""
-
-from __future__ import annotations
-
-import argparse
-import os
-
-from PIL import Image
-from vllm import SamplingParams
-from vllm.multimodal.image import convert_image_mode
-
-from vllm_omni import Omni
-
-DEFAULT_SYSTEM = "You are a helpful assistant."
-DEFAULT_QUESTION = "Please summarize the content of this image."
-
-
-def parse_args() -> argparse.Namespace:
-    parser = argparse.ArgumentParser(description="MammothModa2 image summarization (offline, AR only).")
-    parser.add_argument("--model", type=str, required=True, help="Path to model directory or model id.")
-    parser.add_argument("--deploy-config", type=str, required=True, help="Path to deploy config yaml.")
-    parser.add_argument("--image", type=str, required=True, help="Path to input image.")
-    parser.add_argument("--question", type=str, default=DEFAULT_QUESTION, help="Question/instruction for the model.")
-    parser.add_argument("--system", type=str, default=DEFAULT_SYSTEM, help="System prompt.")
-    parser.add_argument(
-        "--max-tokens",
-        type=int,
-        default=512,
-        help="Max new tokens to generate.",
-    )
-    parser.add_argument("--temperature", type=float, default=0.2)
-    parser.add_argument("--top-p", type=float, default=0.9)
-    parser.add_argument("--seed", type=int, default=42)
-    parser.add_argument("--trust-remote-code", action="store_true")
-    parser.add_argument(
-        "--enable-diffusion-pipeline-profiler",
-        action="store_true",
-        help="Enable diffusion pipeline profiler to display stage durations.",
-    )
-    return parser.parse_args()
-
-
-def build_prompt(system: str, question: str) -> str:
-    return (
-        f"<|im_start|>system\n{system}<|im_end|>\n"
-        "<|im_start|>user\n"
-        "<|vision_start|><|image_pad|><|vision_end|>"
-        f"{question}<|im_end|>\n"
-        "<|im_start|>assistant\n"
-    )
-
-
-def main() -> None:
-    args = parse_args()
-
-    if not os.path.exists(args.image):
-        raise FileNotFoundError(f"Image file not found: {args.image}")
-
-    pil_image = Image.open(args.image)
-    image_data = convert_image_mode(pil_image, "RGB")
-    prompt = build_prompt(args.system, args.question)
-
-    omni = Omni(
-        model=args.model,
-        deploy_config=args.deploy_config,
-        trust_remote_code=args.trust_remote_code,
-        enable_diffusion_pipeline_profiler=args.enable_diffusion_pipeline_profiler,
-    )
-    try:
-        sp = SamplingParams(
-            temperature=float(args.temperature),
-            top_p=float(args.top_p),
-            top_k=-1,
-            max_tokens=int(args.max_tokens),
-            seed=int(args.seed),
-            detokenize=True,
-        )
-        # NOTE: omni.generate() returns a Generator[OmniRequestOutput, None, None].
-        # Consume it inside the try block so the worker isn't closed early.
-        outputs = list(
-            omni.generate(
-                [
-                    {
-                        "prompt": prompt,
-                        "multi_modal_data": {"image": image_data},
-                        "additional_information": {"omni_task": ["chat"]},
-                    }
-                ],
-                [sp],
-            )
-        )
-    finally:
-        omni.close()
-
-    lines: list[str] = []
-    for stage_outputs in outputs:
-        ro = stage_outputs
-        text = ro.outputs[0].text if getattr(ro, "outputs", None) else str(ro)
-        lines.append(f"request_id: {getattr(ro, 'request_id', 'unknown')}\n")
-        lines.append("answer:\n")
-        lines.append(text.strip() + "\n")
-        lines.append("\n")
-
-    print("\n".join(lines))
-
-
-if __name__ == "__main__":
-    main()
@@ -297,7 +297,7 @@ def main(args):
    os.makedirs(output_dir, exist_ok=True)

    for stage_outputs in omni_outputs:
-        output = stage_outputs
+        output = stage_outputs.request_output
        if stage_outputs.final_output_type == "text":
            request_id = output.request_id
            text_output = output.outputs[0].text
@@ -347,7 +347,7 @@ def main(args):
        omni.start_profile(stages=args.profiler_stages)

    for stage_outputs in omni.generate(prompts, sampling_params_list):
-        output = stage_outputs
+        output = stage_outputs.request_output
        if stage_outputs.final_output_type == "text":
            request_id = output.request_id
            text_output = output.outputs[0].text
@@ -452,6 +452,12 @@ def parse_args():
        default=None,
        help="Path to a .txt file with one prompt per line (preferred).",
    )
+    parser.add_argument(
+        "--stage-configs-path",
+        type=str,
+        default=None,
+        help="Path to a stage configs file (deprecated; prefer --deploy-config).",
+    )
    parser.add_argument(
        "--deploy-config",
        type=str,
@@ -1,229 +0,0 @@
-# SPDX-License-Identifier: Apache-2.0
-# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
-"""Offline speech-to-speech with NVIDIA-NemotronLabs-VoiceChat-11B.
-
-Feeds a 16 kHz user utterance (plus a spoken-style system prompt) through the
-3-stage nemotron_voicechat pipeline and writes the agent's reply as text and a
-22.05 kHz WAV.
-
-Usage:
-    python end2end.py \
-        --checkpoint /path/to/NVIDIA-NemotronLabs-VoiceChat-11B \
-        --wav /path/to/user_question_16k.wav \
-        --output-dir results/nemotron_voicechat
-
-The system prompt defaults to the NeMo reference default. The text tokenizer
-resolves from the ``nvidia/NVIDIA-Nemotron-Nano-9B-v2`` HF id (or the
-``NEMOTRON_VOICECHAT_LLM_PATH`` env var for air-gapped runs).
-
-Sizing the input WAV: the timeline is frame-locked, so the reply budget IS the
-input duration — the acoustic channel trails the text channel, and a reply
-that has not finished when the frames run out is truncated SILENTLY (no error;
-ASR of the WAV will just disagree with the emitted text). Leave generous
-trailing silence after the question (a question ending at ~4.5 s truncated in
-an 8 s WAV but completed cleanly in a 16 s one). The script warns when the
-text channel is still emitting non-PAD tokens near the last frame.
-"""
-
-from __future__ import annotations
-
-import argparse
-import json
-import os
-from pathlib import Path
-
-import numpy as np
-import soundfile as sf
-
-# Warn if the text channel is still speaking within this many final frames
-# (12 frames = ~1 s) — the frame-locked reply likely got cut off.
-TRUNCATION_GUARD_FRAMES = 12
-
-# The NeMo reference offline script's default system prompt.
-DEFAULT_SYSTEM_PROMPT = (
-    "You are an AI voice assistant developed by NVIDIA. "
-    "Your name is NVIDIA Voice Chat. "
-    "Answer in a spoken, conversational style rather than a written one. "
-    "Do not repeat the same sentence over and over again. "
-    "Start the conversation by greeting the user."
-)
-
-
-def load_wav_16k_mono(path: str) -> np.ndarray:
-    wav, sr = sf.read(path, dtype="float32")
-    if wav.ndim > 1:
-        wav = wav.mean(axis=1)
-    if sr != 16000:
-        from vllm.multimodal.audio import resample_audio_scipy
-
-        wav = resample_audio_scipy(wav, orig_sr=sr, target_sr=16000)
-    return wav.astype(np.float32)
-
-
-def main() -> None:
-    parser = argparse.ArgumentParser(description=__doc__)
-    parser.add_argument("--checkpoint", required=True, help="NVIDIA-NemotronLabs-VoiceChat-11B directory")
-    parser.add_argument("--wav", required=True, help="user speech (any sr; resampled to 16 kHz mono)")
-    parser.add_argument("--output-dir", default="results/nemotron_voicechat")
-    parser.add_argument("--system-prompt", default=DEFAULT_SYSTEM_PROMPT)
-    parser.add_argument(
-        "--stage-configs-path",
-        default=None,
-        help=(
-            "Deploy yaml override. Pass vllm_omni/deploy/nemotron_labs_voicechat_streaming.yaml "
-            "for the async-chunk streaming pipeline (stages overlap; audio starts decoding "
-            "before the thinker finishes). Default: the bundled non-streaming yaml (bit-exact "
-            "parity path)."
-        ),
-    )
-    args = parser.parse_args()
-
-    if not Path(args.wav).is_file():
-        raise FileNotFoundError(f"Input WAV not found: {args.wav}")
-    ckpt = Path(args.checkpoint)
-    raw_cfg = json.loads((ckpt / "config.json").read_text())
-    stt_cfg = raw_cfg["model"]["stt"]["model"]
-
-    from transformers import AutoTokenizer
-    from vllm.sampling_params import SamplingParams
-
-    from vllm_omni.entrypoints.omni import Omni
-    from vllm_omni.model_executor.models.nemotron_voicechat.nemotron_voicechat_thinker import (
-        compute_acoustic_frame_count,
-    )
-
-    tok_ref = os.environ.get("NEMOTRON_VOICECHAT_LLM_PATH") or stt_cfg.get(
-        "pretrained_llm", "nvidia/NVIDIA-Nemotron-Nano-9B-v2"
-    )
-    tokenizer = AutoTokenizer.from_pretrained(tok_ref, trust_remote_code=False)
-    bos_id = tokenizer.convert_tokens_to_ids(stt_cfg.get("bos_token", "<s>"))
-    eos_id = tokenizer.convert_tokens_to_ids(stt_cfg.get("eos_token", "</s>"))
-    pad_id = tokenizer.convert_tokens_to_ids(stt_cfg.get("pad_token", "<SPECIAL_12>"))
-    # NeMo encode_system_prompt: [bos] + tokens + [eos].
-    prompt_ids = [bos_id] + tokenizer.encode(args.system_prompt, add_special_tokens=False) + [eos_id]
-
-    wav = load_wav_16k_mono(args.wav)
-    n_frames = compute_acoustic_frame_count(stt_cfg, int(wav.shape[0]))
-    print(f"input: {wav.shape[0]} samples @16kHz -> {n_frames} acoustic frames; prompt {len(prompt_ids)} tokens")
-
-    inputs = {
-        # vLLM prompt = system prompt + one placeholder position (acoustic
-        # frame 0); the thinker replaces every position with fused embeddings.
-        "prompt_token_ids": prompt_ids + [pad_id],
-        "additional_information": {
-            # Plain float list: raw ndarrays do not survive the engine-core
-            # message serialization.
-            "nvc_audio": wav.astype(np.float32).tolist(),
-            "nvc_sr": 16000,
-            "nvc_prompt_token_ids": prompt_ids,
-            "nvc_expected_frames": n_frames,
-        },
-    }
-    sampling_params_list = [
-        # thinker: greedy, frame-locked generation length. NO min_tokens: the
-        # tokenizer's eos_token is <SPECIAL_12> — the frame-locked PAD/silence
-        # token — and vLLM's min_tokens masks "EOS" to -inf, which would forbid
-        # silence and force the agent to babble through the whole utterance.
-        SamplingParams(temperature=0.0, max_tokens=n_frames, ignore_eos=True, seed=0),
-        # talker: placeholder loop, stops on the stage's stop token. 16383:
-        # the 1-token placeholder prompt + max_tokens must fit the stage's
-        # max_model_len (16384).
-        SamplingParams(temperature=0.0, max_tokens=16383, stop_token_ids=[1], detokenize=False, seed=0),
-        # code2wav: single decode step.
-        SamplingParams(temperature=0.0, max_tokens=1, detokenize=False, seed=0),
-    ]
-
-    omni_kwargs: dict = {}
-    if args.stage_configs_path:
-        omni_kwargs["stage_configs_path"] = args.stage_configs_path
-    omni = Omni(model=str(ckpt), trust_remote_code=True, **omni_kwargs)
-    outputs = omni.generate(inputs, sampling_params_list)
-
-    out_dir = Path(args.output_dir)
-    out_dir.mkdir(parents=True, exist_ok=True)
-    stem = Path(args.wav).stem
-
-    agent_text = None
-    audio = None
-    sr = 22050
-    for stage_outputs in outputs:
-        # One entry per final stage (text from the thinker, audio from code2wav);
-        # mirrors the qwen2_5_omni offline example's collection loop.
-        output = getattr(stage_outputs, "request_output", stage_outputs)
-        final_type = getattr(stage_outputs, "final_output_type", None)
-        completions = getattr(output, "outputs", None) or []
-        if not completions:
-            continue
-        completion = completions[0]
-        if final_type in (None, "text"):
-            text = getattr(completion, "text", None)
-            if text:
-                agent_text = text
-            token_ids = getattr(completion, "token_ids", None)
-            if token_ids:
-                (out_dir / f"{stem}_text_tokens.json").write_text(json.dumps(list(map(int, token_ids))))
-                # Frame lock: the reply budget IS the input length. If the text
-                # channel is still mid-sentence when the frames run out, the
-                # spoken answer is silently truncated — warn instead.
-                tail = list(map(int, token_ids))[-TRUNCATION_GUARD_FRAMES:]
-                if any(t != pad_id for t in tail):
-                    print(
-                        f"WARNING: the text channel emits non-PAD tokens within the last "
-                        f"{TRUNCATION_GUARD_FRAMES} frames ({TRUNCATION_GUARD_FRAMES * 80} ms) — the reply "
-                        "likely ran out of acoustic frames and is cut off mid-sentence. "
-                        "Pad the input WAV with more trailing silence and rerun."
-                    )
-            # Best-effort: dump the function-channel debug timeline if the
-            # engine surfaced the request info on this output.
-            info = getattr(output, "additional_information", None)
-            func_timeline = info.get("nvc_function_tokens") if isinstance(info, dict) else None
-            if func_timeline is not None:
-                values = func_timeline.tolist() if hasattr(func_timeline, "tolist") else list(func_timeline)
-                (out_dir / f"{stem}_function_tokens.json").write_text(json.dumps([int(v) for v in values]))
-                print(f"function-channel timeline: {len(values)} entries")
-        if final_type in (None, "audio"):
-            # multimodal_output is a MultimodalPayload (Mapping) — duck-type it.
-            mm = getattr(completion, "multimodal_output", None)
-            get = getattr(mm, "get", None)
-            if not callable(get):
-                continue
-            candidate = None
-            for key in ("audio", "model_outputs", "wav", "waveform"):
-                value = get(key)
-                if value is not None:
-                    candidate = value
-                    break
-            if isinstance(candidate, list):
-                candidate = candidate[0] if candidate else None
-            if candidate is not None:
-                arr = np.asarray(
-                    candidate.float().cpu() if hasattr(candidate, "cpu") else candidate, dtype=np.float32
-                ).reshape(-1)
-                if arr.size > 0:
-                    audio = arr
-                sr_val = get("sr")
-                if sr_val is not None:
-                    sr_item = sr_val[0] if isinstance(sr_val, list) else sr_val
-                    sr = int(sr_item.item() if hasattr(sr_item, "item") else sr_item)
-
-    if agent_text is not None:
-        # The frame-locked text channel emits PAD tokens on silent frames;
-        # strip them (NeMo's post-inference detokenizer does the same).
-        pad_token = stt_cfg.get("pad_token", "<SPECIAL_12>")
-        agent_text = " ".join(agent_text.replace(pad_token, " ").split())
-        text_path = out_dir / f"{stem}_output.txt"
-        text_path.write_text(agent_text + "\n")
-        print(f"agent text -> {text_path}\n{agent_text}")
-    else:
-        print("WARNING: no agent text in outputs")
-
-    if audio is not None and audio.size > 0:
-        wav_path = out_dir / f"{stem}_output.wav"
-        sf.write(wav_path, audio, sr)
-        print(f"agent audio -> {wav_path} ({audio.size / sr:.2f}s @ {sr} Hz)")
-    else:
-        raise RuntimeError("No audio produced by the code2wav stage.")
-
-
-if __name__ == "__main__":
-    main()
@@ -392,7 +392,7 @@ def main(args):
    total_requests = len(prompts)
    processed_count = 0
    for stage_outputs in omni_generator:
-        output = stage_outputs
+        output = stage_outputs.request_output
        if stage_outputs.final_output_type == "text":
            request_id = output.request_id
            text_output = output.outputs[0].text
@@ -367,7 +367,7 @@ def main(args):
    print(f"query type: {args.query_type}")

    for stage_outputs in omni_generator:
-        output = stage_outputs
+        output = stage_outputs.request_output
        if stage_outputs.final_output_type == "text":
            request_id = output.request_id
            text_output = output.outputs[0].text
@@ -484,10 +484,10 @@ def parse_args():
        help="Path to a .txt file with one prompt per line (preferred).",
    )
    parser.add_argument(
-        "--deploy-config",
+        "--stage-configs-path",
        type=str,
        default=None,
-        help="Path to a deploy config YAML.",
+        help="Path to a stage configs file.",
    )
    parser.add_argument(
        "--video-path",
@@ -237,7 +237,7 @@ async def run_single_request(
            sampling_params_list=sampling_params_list,
            output_modalities=output_modalities,
        ):
-            output = omni_output
+            output = omni_output.request_output
            if omni_output.final_output_type == "text":
                if stage_0_first_output_ts is None:
                    stage_0_first_output_ts = time.perf_counter()
@@ -26,6 +26,7 @@ import torch
 from vllm_omni.diffusion.data import DiffusionParallelConfig
 from vllm_omni.entrypoints.omni import Omni
 from vllm_omni.inputs.data import OmniDiffusionSamplingParams
+from vllm_omni.outputs import OmniRequestOutput
 from vllm_omni.platforms import current_omni_platform


@@ -351,8 +352,8 @@ def main():
        else:
            print("[Profiler] No valid profiling data returned.")

-    # omni.generate() returns a list for sync calls; unwrap single-result list.
-    output = result[0] if isinstance(result, list) else result
+    # Extract output from result
+    output = OmniRequestOutput.unwrap_result(result)

    if not output.images:
        raise ValueError("No video frames found in OmniRequestOutput.")
@@ -232,8 +232,15 @@ def main(args):
        raise ValueError(f"Unknown query type: {args.query_type}")

    # Initialize vLLM-Omni with Step-Audio2
-    # Resolve an explicit deploy config or use the bundled task default.
-    if args.deploy_config:
+    # Resolve deploy config path. Keep explicit stage_configs_path for legacy
+    # custom configs, but use bundled deploy configs by default.
+    deploy_config_path = None
+    stage_config_path = None
+    if args.stage_configs_path and args.deploy_config:
+        raise ValueError("--stage-configs-path and --deploy-config are mutually exclusive")
+    if args.stage_configs_path:
+        stage_config_path = args.stage_configs_path
+    elif args.deploy_config:
        deploy_config_path = args.deploy_config
    else:
        configs_dir = Path(__file__).parent.parent.parent.parent / "vllm_omni/deploy"
@@ -255,7 +262,10 @@ def main(args):
        "ray_address": args.ray_address,
        "trust_remote_code": True,
    }
-    omni_kwargs["deploy_config"] = deploy_config_path
+    if stage_config_path is not None:
+        omni_kwargs["stage_configs_path"] = stage_config_path
+    else:
+        omni_kwargs["deploy_config"] = deploy_config_path

    omni_llm = Omni(**omni_kwargs)

@@ -335,7 +345,7 @@ def main(args):
    # Process outputs from each stage
    for stage_idx, stage_outputs in enumerate(omni_outputs):
        # request_output may be a single object or a list
-        raw_output = stage_outputs
+        raw_output = stage_outputs.request_output
        outputs_list = raw_output if isinstance(raw_output, list) else [raw_output]

        if stage_outputs.final_output_type == "text":
@@ -408,6 +418,12 @@ def parse_args():
            "  - HuggingFace ID: stepfun-ai/Step-Audio-2-mini"
        ),
    )
+    parser.add_argument(
+        "--stage-configs-path",
+        type=str,
+        default=None,
+        help="Path to a legacy stage config YAML file (default: use bundled deploy config)",
+    )
    parser.add_argument(
        "--deploy-config",
        type=str,
@@ -43,7 +43,6 @@ from vllm_omni.diffusion.utils.param_utils import apply_declared_extra_args
 from vllm_omni.entrypoints.omni import Omni
 from vllm_omni.inputs.data import OmniDiffusionSamplingParams
 from vllm_omni.model_extras import get_extra_body_params, get_model_class_name
-from vllm_omni.outputs import OmniRequestOutput
 from vllm_omni.platforms import current_omni_platform

 AUDIOX_TASKS = ("t2a", "t2m", "v2a", "v2m", "tv2a", "tv2m")
@@ -389,9 +388,9 @@ def main():
        raise ValueError("No output generated from omni.generate()")

    output = outputs[0]
-    if not isinstance(output, OmniRequestOutput) or not output:
+    if not hasattr(output, "request_output") or not output.request_output:
        raise ValueError("No request_output found in OmniRequestOutput")
-    request_output = output
+    request_output = output.request_output
    if not hasattr(request_output, "multimodal_output"):
        raise ValueError("No multimodal_output found in request_output")

@@ -115,7 +115,7 @@ def build_demo(args: argparse.Namespace) -> gr.Blocks:
        )
        images_outputs = []
        for output in outputs:
-            req_out = output
+            req_out = output.request_output
            if not isinstance(req_out, OmniRequestOutput) or not hasattr(req_out, "images"):
                raise ValueError("Invalid request_output structure or missing 'images' key")
            images = req_out.images
@@ -92,6 +92,12 @@ def parse_args() -> argparse.Namespace:
        "meituan-longcat/LongCat-Image, OvisAI/Ovis-Image, "
        "stabilityai/stable-diffusion-3.5-medium, Tongyi-MAI/Z-Image-Turbo and etc.",
    )
+    parser.add_argument(
+        "--stage-configs-path",
+        type=str,
+        default=None,
+        help="[Deprecated] Path to a legacy stage_args-format YAML. Prefer --deploy-config.",
+    )
    parser.add_argument(
        "--deploy-config",
        type=str,
@@ -469,6 +475,8 @@ def main():
        omni_kwargs["tensor_parallel_size"] = args.tensor_parallel_size
    if args.enforce_eager is not None:
        omni_kwargs["enforce_eager"] = args.enforce_eager
+    if args.stage_configs_path:
+        omni_kwargs["stage_configs_path"] = args.stage_configs_path
    if args.deploy_config:
        omni_kwargs["deploy_config"] = args.deploy_config
    if use_nextstep:
@@ -507,8 +515,8 @@ def main():
    print(f"  Image size: {args.width}x{args.height}")
    if args.lora_path:
        print(f"  LoRA: scale={args.lora_scale}")
-    if args.deploy_config:
-        print(f"  deploy-config: {args.deploy_config}")
+    if args.stage_configs_path:
+        print(f"  stage-configs-path: {args.stage_configs_path}")
    print(f"{'=' * 60}\n")

    # Build LoRA request when --lora-path is set
@@ -648,7 +656,7 @@ def main():
        images = getattr(output, "images", None)
        if images:
            break
-        req_out = output
+        req_out = getattr(output, "request_output", None)
        images = getattr(req_out, "images", None) if req_out is not None else None
        if images:
            break
@@ -23,7 +23,6 @@ list of supported architectures across all modalities, see
 | OmniVoice | `k2-fsa/OmniVoice` | 2 (gen + dec) | ✓ | — | voice design, language hint | 24 kHz |
 | Qwen3-TTS | `Qwen/Qwen3-TTS-12Hz-1.7B-{CustomVoice,VoiceDesign,Base}` | 2 (talker + code2wav) | ✓ (Base) | ✓ | 3 task variants | 24 kHz |
 | VoxCPM2 | `openbmb/VoxCPM2` | single (native AR) | ✓ | ✓ (online) | continuation | 48 kHz |
-| dots.tts | `rednote-hilab/dots.tts-soar` | single (native AR) | — (not wired yet) | — | — | 48 kHz |
 | IndexTTS-2 | `IndexTeam/IndexTTS-2` | 2 (AR talker + S2Mel DiT + BigVGAN) | ✓ (required) | — | emotion control (`--emo-audio`, `--emo-text`, `--emo-vector`) | 22.05 kHz |
 | IndexTTS-2.5 | native `checkpoints/` bundle | 2 (AR talker + EnhancedCodec + S2Mel DiT + BigVGAN) | ✓ (required) | — | multilingual (`--lang`) + emotion control | 22.05 kHz |
 | Voxtral TTS | `mistralai/Voxtral-4B-TTS-2603` | varies | ✓ | ✓ | voice presets | 24 kHz |
@@ -373,10 +372,18 @@ python examples/offline_inference/text_to_speech/qwen3_tts/end2end.py \
 Streaming requires `async_chunk: true` in the stage config.

 ### Word Timestamps
-Word-level timestamps are currently a serving-path feature: launch
-`vllm-omni serve` with `--forced-aligner` and request `word_timestamps`
-(see `examples/online_serving/text_to_speech/README.md`). An offline
-example is not provided in this release.
+Generate a WAV offline and a JSON sidecar with word-level timestamps from
+`Qwen/Qwen3-ForcedAligner-0.6B`:
+```bash
+python examples/offline_inference/text_to_speech/qwen3_tts/word_timestamps.py \
+    --model Qwen/Qwen3-TTS-12Hz-1.7B-CustomVoice \
+    --forced-aligner Qwen/Qwen3-ForcedAligner-0.6B \
+    --text "Hello world." \
+    --output-dir /tmp/qwen3_tts_timestamps
+```
+The script writes `qwen3_tts_word_timestamps.wav` and
+`qwen3_tts_word_timestamps.json`. On machines without a local CUDA toolkit,
+set `VLLM_USE_FLASHINFER_SAMPLER=0` to avoid FlashInfer sampler JIT.

 ### Batched decoding
 The Code2Wav stage supports batched decoding through the SpeechTokenizer. Pass multiple prompts via `--txt-prompts` and set `--batch-size` accordingly. To raise `max_num_seqs` on either stage, point `--stage-configs-path` at a stage configs YAML with the desired values (see `vllm_omni/model_executor/stage_configs/` for templates):
@@ -431,31 +438,6 @@ Streaming is exposed through the online OpenAI Speech API (`stream=true`). See [

 ---

-## dots.tts
-
-Single-stage native AR TTS at 48 kHz (rednote-hilab). Pipeline: `Qwen2.5-1.5B base LM → DiT (10-step Euler flow matching) → patch_encoder AR loopback → AudioVAE (streaming decode)`. Same "vLLM-native base LM + side-path computation" pattern as VoxCPM2, with a plain Qwen2 backbone instead of MiniCPM4 and no FSQ / residual LM stage.
-
-### Quick start
-```bash
-python examples/offline_inference/text_to_speech/dots_tts/end2end.py \
-    --model rednote-hilab/dots.tts-soar \
-    --text "Hello, this is a test of dots TTS running on vLLM Omni."
-```
-
-### Voice cloning
-Not wired in this release — generation is zero-shot only. The CAM++ x-vector speaker encoder weights load, but `end2end.py` has no `--ref-audio`/`--ref-text` flags yet.
-
-### Streaming
-The AudioVAE decoder has an internal streaming path (`init_stream_state` / `stream_step` / `stream_flush`) used to avoid boundary artifacts between 160 ms patches, but it is not yet exposed through an online serving endpoint or example.
-
-### Notes
- Output: 48 kHz mono WAV.
- Deploy config: `vllm_omni/deploy/dots_tts.yaml` (auto-loaded by HF `model_type`).
- Checkpoints: `rednote-hilab/dots.tts-soar` is the validated default. `dots.tts-base` shares the same architecture but is unvalidated in this repo. `dots.tts-mf` (MeanFlow, 2-4 step) is not supported yet.
- Known limitation: no CUDA graph capture and no batched side-path computation yet, so concurrent requests do not currently scale (each request's DiT Euler steps run serially). See `recipes/rednote-hilab/dots.tts.md` for details and the roadmap.
-
---
-
 ## IndexTTS-2 and IndexTTS-2.5

 Both versions use a 2-stage TTS pipeline and produce 22.05 kHz mono audio. Stage 0 is a GPT AR talker. IndexTTS-2 Stage 1 uses RepCodec semantic embeddings, GPT latent, S2Mel CFM/DiT, and BigVGAN. IndexTTS-2.5 replaces RepCodec with EnhancedCodec and uses the official code-only path (`use_gpt_latent=false`). Every request requires reference audio for zero-shot voice cloning.
@@ -168,7 +168,7 @@ def run_e2e():
    print(f"Received {len(outputs)} outputs.")
    for i, output in enumerate(outputs):
        try:
-            ro = output
+            ro = output.request_output
            if ro is None:
                print("No request_output found.")
                continue
@@ -1,125 +0,0 @@
-"""Offline dots.tts inference example (single-stage native AR pipeline).
-
-Uses the single-stage native AR config (vllm_omni/deploy/dots_tts.yaml).
-Reference checkpoint: rednote-hilab/dots.tts-soar.
-"""
-
-from __future__ import annotations
-
-import os
-import time
-from pathlib import Path
-
-import soundfile as sf
-import torch
-
-from vllm_omni import Omni
-from vllm_omni.utils.tracking_parser import TrackingArgumentParser
-
-REPO_ROOT = Path(__file__).resolve().parents[4]
-SAMPLE_RATE = 48_000
-
-
-def parse_args():
-    parser = TrackingArgumentParser(description="Offline dots.tts native AR inference")
-    parser.add_argument(
-        "--model",
-        type=str,
-        default="rednote-hilab/dots.tts-soar",
-        help="dots.tts model path or HuggingFace repo ID.",
-    )
-    parser.add_argument(
-        "--text",
-        type=str,
-        default="Hello, this is a test of dots TTS running on vLLM Omni.",
-        help="Text to synthesize.",
-    )
-    parser.add_argument(
-        "--output-dir",
-        type=str,
-        default="output_audio",
-        help="Directory for output WAV files.",
-    )
-    parser.add_argument(
-        "--deploy-config",
-        type=str,
-        default=None,
-        help="Override the deploy config path. If unset, auto-loads "
-        "vllm_omni/deploy/dots_tts.yaml based on the HF model_type.",
-    )
-    return parser.parse_args()
-
-
-def extract_audio(multimodal_output: dict) -> torch.Tensor:
-    """Extract the final complete audio tensor from multimodal output.
-
-    The output processor concatenates per-step delta tensors under
-    ``model_outputs``.  Falls back to ``audio`` for backwards compat.
-    """
-    audio = multimodal_output.get("model_outputs")
-    if audio is None:
-        audio = multimodal_output.get("audio")
-    if audio is None:
-        raise ValueError(f"No audio key in multimodal_output: {list(multimodal_output.keys())}")
-
-    if isinstance(audio, list):
-        valid = [torch.as_tensor(a).float().cpu().reshape(-1) for a in audio if a is not None]
-        if not valid:
-            raise ValueError("Audio list is empty or all elements are None.")
-        return torch.cat(valid, dim=0) if len(valid) > 1 else valid[0]
-
-    return torch.as_tensor(audio).float().cpu().reshape(-1)
-
-
-def main():
-    args = parse_args()
-
-    output_dir = Path(args.output_dir)
-    output_dir.mkdir(parents=True, exist_ok=True)
-
-    engine = Omni(
-        model=args.model,
-        deploy_config=args.deploy_config,
-    )
-
-    from transformers import AutoTokenizer
-
-    from vllm_omni.model_executor.models.dots_tts.dots_tts_prompt import (
-        build_dots_tts_prompt,
-    )
-
-    tokenizer = AutoTokenizer.from_pretrained(args.model, trust_remote_code=True)
-
-    prompt = build_dots_tts_prompt(
-        tokenizer=tokenizer,
-        text=args.text,
-    )
-
-    print(f"Model       : {args.model}")
-    print(f"Text        : {args.text}")
-    print(f"Output dir  : {output_dir}")
-    print(f"Prompt len  : {len(prompt['prompt_token_ids'])} tokens")
-
-    t_start = time.perf_counter()
-    outputs = engine.generate([prompt])
-    elapsed = time.perf_counter() - t_start
-
-    request_output = outputs[0]
-    mm = request_output.outputs[0].multimodal_output
-    audio = extract_audio(mm)
-
-    duration = audio.numel() / SAMPLE_RATE
-    rtf = elapsed / duration if duration > 0 else float("inf")
-
-    output_path = output_dir / "output.wav"
-    sf.write(str(output_path), audio.numpy(), SAMPLE_RATE, format="WAV")
-
-    print(f"Saved       : {output_path}")
-    print(f"Duration    : {duration:.2f}s")
-    print(f"Inference   : {elapsed:.2f}s")
-    print(f"RTF         : {rtf:.3f}")
-
-
-if __name__ == "__main__":
-    os.environ["VLLM_WORKER_MULTIPROC_METHOD"] = "spawn"
-    main()
@@ -38,7 +38,7 @@ from vllm_omni.utils.tracking_parser import TrackingArgumentParser
 logger = logging.getLogger(__name__)

 DEFAULT_MODEL = "fishaudio/s2-pro"
-DEFAULT_DEPLOY_CONFIG = os.path.join(
+DEFAULT_STAGE_CONFIG = os.path.join(
    os.path.dirname(__file__),
    "..",
    "..",
@@ -152,7 +152,10 @@ def _build_omni_kwargs(args, model_name: str) -> dict:
        log_stats=args.log_stats,
        stage_init_timeout=args.stage_init_timeout,
    )
-    omni_kwargs["deploy_config"] = args.deploy_config or DEFAULT_DEPLOY_CONFIG
+    if args.deploy_config:
+        omni_kwargs["deploy_config"] = args.deploy_config
+    else:
+        omni_kwargs["stage_configs_path"] = args.stage_configs_path or DEFAULT_STAGE_CONFIG
    return omni_kwargs


@@ -176,7 +179,7 @@ def main(args):

    t_start = time.perf_counter()
    for stage_outputs in omni.generate(inputs):
-        request_output = stage_outputs
+        request_output = stage_outputs.request_output
        if request_output is None or not request_output.outputs:
            continue
        _save_wav(
@@ -212,7 +215,7 @@ async def main_streaming(args):
    sample_rate = None

    async for stage_output in omni.generate(prompt, request_id=request_id):
-        mm = stage_output.outputs[0].multimodal_output
+        mm = stage_output.request_output.outputs[0].multimodal_output
        if not stage_output.finished:
            t_now = time.perf_counter()
            sample_rate, n = _collect_audio_chunk(mm, all_audio_chunks, sample_rate)
@@ -275,6 +278,12 @@ def parse_args():
        default=None,
        help="Deploy config YAML path (under vllm_omni/deploy/).",
    )
+    parser.add_argument(
+        "--stage-configs-path",
+        type=str,
+        default=None,
+        help="Path to stage configs YAML (legacy, prefer --deploy-config).",
+    )
    parser.add_argument(
        "--output-dir",
        default="output_audio",
@@ -145,7 +145,7 @@ def main(args):

    omni = Omni(
        model=args.model,
-        deploy_config=deploy_config_path,
+        stage_configs_path=deploy_config_path,
        log_stats=args.log_stats,
        stage_init_timeout=args.stage_init_timeout,
    )
@@ -137,7 +137,7 @@ def main(args) -> None:
    params_list = sampling_params

    for stage_outputs in omni.generate(inputs, params_list):
-        for i, req_output in enumerate(stage_outputs):
+        for i, req_output in enumerate(stage_outputs.request_output):
            for j, out in enumerate(req_output.outputs):
                mm = out.multimodal_output
                if mm is None:
@@ -135,7 +135,7 @@ def run_e2e():
    print(f"Received {len(outputs)} outputs.")
    for i, output in enumerate(outputs):
        try:
-            ro = output
+            ro = output.request_output
            if ro is None:
                print("No request_output found.")
                continue
@@ -391,7 +391,7 @@ def main(args):
    for batch_start in range(0, len(inputs), batch_size):
        batch = inputs[batch_start : batch_start + batch_size]
        for stage_outputs in omni.generate(batch):
-            output = stage_outputs
+            output = stage_outputs.request_output
            _save_wav(output_dir, output.request_id, output.outputs[0].multimodal_output)


@@ -412,7 +412,7 @@ async def main_streaming(args):
        t_prev = t_start
        chunk_idx = 0
        async for stage_output in omni.generate(prompt, request_id=request_id):
-            mm = stage_output.outputs[0].multimodal_output
+            mm = stage_output.request_output.outputs[0].multimodal_output
            if not stage_output.finished:
                t_now = time.perf_counter()
                audio = mm.get("audio")
@@ -490,10 +490,10 @@ def parse_args():
        help="Path to a .txt file with one prompt per line (preferred).",
    )
    parser.add_argument(
-        "--deploy-config",
+        "--stage-configs-path",
        type=str,
        default=None,
-        help="Path to a deploy config YAML.",
+        help="Path to a stage configs file.",
    )
    parser.add_argument(
        "--audio-path",
@@ -116,7 +116,7 @@ def main(args: Any) -> None:
    prompt = _build_custom_voice_input(args)
    final_output = None
    for stage_outputs in omni.generate([prompt]):
-        final_output = stage_outputs
+        final_output = stage_outputs.request_output
    if final_output is None:
        raise RuntimeError("Qwen3-TTS did not produce an output.")

@@ -38,7 +38,7 @@ def _stage_durations_from_output(outputs) -> dict[str, float]:
    durations = getattr(omni_out, "stage_durations", None) or {}
    if durations:
        return dict(durations)
-    ro = omni_out
+    ro = getattr(omni_out, "request_output", None)
    if ro is not None:
        return dict(getattr(ro, "stage_durations", None) or {})
    return {}
@@ -99,7 +99,7 @@ def extract_audio(outputs) -> tuple[np.ndarray, int]:
    out = outputs[0]
    mm = getattr(out, "multimodal_output", None)
    if mm is None:
-        ro = out
+        ro = getattr(out, "request_output", None)
        if ro is not None:
            mm = getattr(ro, "multimodal_output", None)
            if mm is None and ro.outputs:
@@ -8,7 +8,6 @@ A unified script for text-to-video generation. Supports multiple models with mod
 |---|---|---|---|---|---|
 | `Wan-AI/Wan2.1-VACE-1.3B-diffusers` | 480x832 | 81 | 30 | 5.0 | ~20 GiB (RTX 5090, VAE tiling) |
 | `Wan-AI/Wan2.2-T2V-A14B-Diffusers` | 720x1280 | 81 | 40 | 4.0 | ~60 GiB |
-| `robbyant/lingbot-video-dense-1.3b` / `robbyant/lingbot-video-moe-30b-a3b` | 192x320 | 9 | 2 | 3.0 | ~68 GiB (MoE smoke) |
 | `Lightricks/LTX-2` | 512x768 | 121 | 40 | video 3.0 / audio 7.0 | Model-dependent |
 | `hunyuanvideo-community/HunyuanVideo-1.5-Diffusers-480p_t2v` | 480x832 | 121 | 50 | 6.0 | 1×A100 80GB |
 | `hunyuanvideo-community/HunyuanVideo-1.5-Diffusers-720p_t2v` | 720x1280 | 121 | 50 | 6.0 | FP8 + VAE tiling required |
@@ -58,31 +57,18 @@ python text_to_video.py \

 ### LingBot-Video

-The shared runner recognizes the official dense and MoE checkpoint IDs, selects
-`LingBotVideoPipeline`, and builds the canonical video request envelope:
+The dedicated LingBot example explicitly selects the video output modality:

 ```bash
-python text_to_video.py \
+python examples/offline_inference/text_to_video/text_to_video_lingbot.py \
  --model robbyant/lingbot-video-dense-1.3b \
-  --prompt "a robotic arm picks up a red block" \
  --height 192 --width 320 --num-frames 9 --num-inference-steps 2 \
-  --guidance-scale 3.0 --flow-shift 3.0 --fps 24 \
  --output lingbot_t2v.mp4
 ```

 Use the same command with `robbyant/lingbot-video-moe-30b-a3b` for the MoE
 checkpoint. Requested frame counts are rounded upward to the causal
-VAE's `4n+1` grid. For a local checkpoint path whose name does not contain
-`lingbot`, pass `--model-class-name LingBotVideoPipeline`.
-
-LingBot-only options such as `batch_cfg` and `output_type` use the shared
-model-extra channel, for example:
-
-```bash
-python text_to_video.py \
-  --model robbyant/lingbot-video-dense-1.3b \
-  --extra-body '{"batch_cfg": true, "output_type": "np"}'
-```
+VAE's `4n+1` grid.

 ### LTX-2