[Model] Add Krea 2 text-to-image diffusion model (#4730)

Signed-off-by: Abhinay1997 <devarintinagasaiabhinay@gmail.com>
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Naga Sai Abhinay Devarinti authored and GitHub committed 2026-07-11 16:25:41 -07:00
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@@ -650,6 +650,8 @@ steps:
tests/e2e/online_serving/test_qwen_image_edit_expansion.py
tests/e2e/online_serving/test_qwen_image_layered_expansion.py
tests/e2e/online_serving/test_bagel_expansion.py
tests/e2e/online_serving/test_krea2_expansion.py
tests/e2e/offline_inference/test_krea2_expansion.py
-m "full_model and diffusion and H100 and not distributed_cuda"
--run-level "full_model"
agents:
@@ -693,6 +695,7 @@ steps:
pytest -sv
tests/e2e/online_serving/test_qwen_image_expansion.py
tests/e2e/online_serving/test_qwen_image_edit_expansion.py
tests/e2e/offline_inference/test_krea2_expansion.py
-m "full_model and diffusion and H100 and distributed_cuda"
--run-level "full_model"
agents:
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@@ -34,6 +34,7 @@ th {
| `QwenImageEditPlusPipeline` | Qwen-Image-Edit-2511 | `Qwen/Qwen-Image-Edit-2511` | ✅︎ | ✅︎ | ✅︎ | ✅︎ |
| `GlmImagePipeline` | GLM-Image | `zai-org/GLM-Image` | ✅︎ | ✅︎ | | |
| `ZImagePipeline` | Z-Image | `Tongyi-MAI/Z-Image-Turbo` | ✅︎ | ✅︎ | ✅︎ | ✅︎ |
| `Krea2Pipeline` | Krea 2 (Raw + Turbo) | `krea/Krea-2-Raw`, `krea/Krea-2-Turbo` | ✅︎ | | | |
| `WanPipeline` | Wan2.1-T2V, Wan2.2-T2V, Wan2.2-TI2V | `Wan-AI/Wan2.1-T2V-1.3B-Diffusers`, `Wan-AI/Wan2.1-T2V-14B-Diffusers`, `Wan-AI/Wan2.2-T2V-A14B-Diffusers`, `Wan-AI/Wan2.2-TI2V-5B-Diffusers` | ✅︎ | ✅︎ | ✅︎ | ✅︎ |
| `WanImageToVideoPipeline` | Wan2.2-I2V | `Wan-AI/Wan2.2-I2V-A14B-Diffusers` | ✅︎ | ✅︎ | ✅︎ | ✅︎ |
| `Cosmos3OmniDiffusersPipeline` | Cosmos3 T2I, T2V, I2V, V2V, T2V with sound, action policy | `nvidia/Cosmos3-Nano`, `nvidia/Cosmos3-Super` | ✅︎ | ✅︎ | ✅︎ | ✅︎ |
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@@ -121,6 +121,7 @@ The following tables show which models support each feature:
| **GLM-Image** | ❌ | ❌ | ❌ | ✅ | ✅ | ❌ | ✅ | ❌ | ❌ | ❌ | ❌ |
| **Hidream-I1-Full** | ❌ | ❌ | ❌ | ❌ | ✅ | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ |
| **HunyuanImage3** | ❌ | ✅ | ❌ | ❌ | ✅ | ❌ | ❌ | ❌ | ❌ | ✅ | ❌ |
| **Krea 2** | ❌ | ✅ | ❌ | ❌ | ❌ | ❌ | ✅ | ✅ | ✅ (decode) | ❌ | ❌ |
| **LongCat-Image** | ✅ | ✅ | ✅ | ✅ | ✅ | ❌ | ❌ | ✅ | ❌ | ❌ | ❌ |
| **LongCat-Image-Edit** | ✅ | ✅ | ✅ | ✅ | ✅ | ❌ | ❌ | ✅ | ❌ | ❌ | ❌ |
| **MagiHuman** | ❌ | ❌ | ❌ | ❓ | ✅ | ❌ | ❌ | ✅ | ❌ | ❌ | ❌ |
@@ -144,6 +145,7 @@ The following tables show which models support each feature:
> 1. Nextstep_1(T2I) does not support cache acceleration methods such as TeaCache or Cache-DiT.
> 2. `Tongyi-MAI/Z-Image-Turbo` and `SII-GAIR/daVinci-MagiHuman-Base-1080p` are distilled models with minimal NFEs; CFG-Parallel is not necessary.
> 3. Cosmos3 T2I uses `Cosmos3OmniDiffusersPipeline` with `modalities=["image"]`. Model-level CPU offload is not supported; use layerwise offload.
> 4. Krea 2 currently supports single-GPU inference plus LoRA, Cache-DiT, HSDP, CPU/layerwise offload, and VAE-patch-parallel (decode). TP/SP/CFG-Parallel are not yet wired. The few-step distilled (Turbo) checkpoint uses `is_distilled=true` (fixed timestep shift `mu=1.15`); generate at 2048x2048 by default with `num_inference_steps≈8` and `guidance_scale=0`. The Raw checkpoint uses 1024x1024, `num_inference_steps=28`, and `guidance_scale=4.5`.
### VideoGen
@@ -36,6 +36,7 @@ This folder provides several entrypoints for experimenting with text-to-image di
| `black-forest-labs/FLUX.2-dev` | 1024 x 1024 | 65.7 | >80 (CPU offload required) |
| `HunyuanImage-3.0` | 1024 x 1024 | 80.0 (TP≥3) | 160 |
| `HiDream-I1-Full` | 1024 x 1024 | 63.7 | 57.7 |
| `krea/Krea-2-Raw`, `krea/Krea-2-Turbo` | 1024 (Raw) / 2048 (Turbo) | — | ~30 |
!!! info
*Peak VRAM: based on basic single-card usage, batch size =1, without any acceleration/optimization features. FLUX.2-dev requires `--enable-cpu-offload` on a single 80 GiB GPU.
@@ -196,6 +197,37 @@ python examples/offline_inference/text_to_image/text_to_image.py \
--output /output.png
```
### Krea 2
Krea 2 is published as diffusers-format checkpoints: `krea/Krea-2-Turbo` (few-step distilled) and `krea/Krea-2-Raw`.
The pipeline class (`Krea2Pipeline`) is auto-detected from `model_index.json`. The distilled Turbo checkpoint sets
`is_distilled=true` and is best run at 2048x2048 with few steps and guidance disabled:
```bash
# Few-step distilled (Turbo) checkpoint
python examples/offline_inference/text_to_image/text_to_image.py \
--model krea/Krea-2-Turbo \
--prompt "a fox in the snow" \
--num-inference-steps 8 \
--guidance-scale 0.0 \
--height 2048 --width 2048 \
--output krea2.png
```
For the Raw checkpoint, use more steps with CFG enabled:
```bash
python examples/offline_inference/text_to_image/text_to_image.py \
--model krea/Krea-2-Raw \
--prompt "a fox in the snow" \
--num-inference-steps 28 \
--guidance-scale 4.5 \
--output krea2.png
```
`guidance-scale` follows the Krea 2 convention (`velocity = cond + guidance_scale * (cond - uncond)`); CFG is enabled
whenever `guidance-scale > 0`.
### Batch Requests (Multiple Prompts)
You can pass multiple prompts in a single `Omni.generate` call. `Omni`
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@@ -44,6 +44,7 @@ recipes/
| [`inclusionAI/Ming-flash-omni-2.0.md`](./inclusionAI/Ming-flash-omni-2.0.md) | Online serving for multimodal chat + standalone TTS | 4x H100 / 1x H100 80GB |
| [`inclusionAI/Ming-omni-tts.md`](./inclusionAI/Ming-omni-tts.md) | Offline + online dense Ming TTS/audio generation | 1x H100 80GB / 1x AMD MI300X (ROCm 7.2) |
| [`IndexTeam/IndexTTS-2.md`](./IndexTeam/IndexTTS-2.md) | Online serving for voice-cloned TTS with optional emotion control | 1x L4 24GB or larger CUDA GPU |
| [`krea/Krea-2.md`](./krea/Krea-2.md) | Text-to-image (Turbo + Raw), offline + online, with LoRA | 1x H100 80GB |
| [`LTX/LTX-2.md`](./LTX/LTX-2.md) | Text-to-video and image-to-video serving | 1x H200 141GB |
| [`LTX/LTX-2.3.md`](./LTX/LTX-2.3.md) | Text-to-video with audio generation (22B) | 1x GPU (96GB VRAM) |
| [`MammothModa2/MammothModa2-Preview.md`](./MammothModa2/MammothModa2-Preview.md) | Text-to-image with the shared offline image example (AR → DiT) | 1x L40S 48GB / 1x ≥40GB GPU |
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# Krea 2 for text-to-image (base + LoRA)
## Summary
- Vendor: Krea
- Model: `krea/Krea-2-Turbo` (few-step distilled) and `krea/Krea-2-Raw`
- Task: Text-to-image (T2I)
- Mode: Offline engine and online OpenAI-compatible serving
- Maintainer: Community
## When to use this recipe
Use this recipe for a known-good starting point to run the Krea 2 single-stream
MMDiT with vLLM-Omni on a **single 80 GB NVIDIA H100** — both the offline
`text_to_image.py` entrypoint and the online `/v1/images/generations` route,
including PEFT LoRA adapters. `Krea2Pipeline` is auto-detected from
`model_index.json`; guidance is checkpoint-aware (distilled Turbo runs no-CFG,
Raw runs CFG).
## References
- Related example under `examples/`:
[`examples/offline_inference/text_to_image/README.md`](../../examples/offline_inference/text_to_image/README.md)
(see the "Krea 2" section)
- Feature support:
[`docs/user_guide/diffusion_features.md`](../../docs/user_guide/diffusion_features.md)
- Related PR: [#4730](https://github.com/vllm-project/vllm-omni/pull/4730)
## Hardware Support
This recipe documents a **single-GPU** CUDA layout on H100 80 GB. Add more
platforms (ROCm / NPU) or multi-GPU layouts as community validation lands.
## GPU
### 1× H100 80GB
#### Environment
Versions from a working editable install (activate `vllm-omni/.venv` or your equivalent):
- OS: Linux
- Python: 3.12
- Driver / runtime: NVIDIA driver **595.71.05** (CUDA 13.x)
- torch: **2.11.0+cu130**
- vLLM: **0.24.0**
- vLLM-Omni: editable install from this repo (Git **`960ce8f6`**)
- Transformers: **5.12.1**
Krea 2 weights are ~30 GB and fit comfortably on a single 80 GB H100.
#### Command
Offline — few-step distilled (Turbo) checkpoint (2048×2048, no CFG):
```bash
python examples/offline_inference/text_to_image/text_to_image.py \
--model krea/Krea-2-Turbo \
--prompt "a fox in the snow" \
--num-inference-steps 8 \
--guidance-scale 0.0 \
--height 2048 --width 2048 \
--output krea2_turbo.png
```
Offline — Raw checkpoint (1024×1024, CFG enabled):
```bash
python examples/offline_inference/text_to_image/text_to_image.py \
--model krea/Krea-2-Raw \
--prompt "a fox in the snow" \
--num-inference-steps 28 \
--guidance-scale 4.5 \
--height 1024 --width 1024 \
--output krea2_raw.png
```
LoRA (offline) — pass a PEFT adapter with `--lora-path` / `--lora-scale`.
`NagaSaiAbhinay/Krea-2-vllm-darkbrush-LoRA` is a vLLM-Omni-compatible repackaging
of `krea/Krea-2-LoRA-darkbrush`; its trigger word is `monochrome ink wash style`:
```bash
python examples/offline_inference/text_to_image/text_to_image.py \
--model krea/Krea-2-Turbo \
--prompt "a fox in the snow, monochrome ink wash style" \
--num-inference-steps 8 --guidance-scale 0.0 \
--lora-path NagaSaiAbhinay/Krea-2-vllm-darkbrush-LoRA --lora-scale 1.0 \
--output krea2_darkbrush.png
```
Online — serve and query the OpenAI-compatible image route:
```bash
vllm serve krea/Krea-2-Turbo --omni --enforce-eager --port 8091
```
```bash
curl -s http://localhost:8091/v1/images/generations \
-H "Content-Type: application/json" \
-d '{
"prompt": "a fox in the snow, monochrome ink wash style",
"size": "1024x1024",
"num_inference_steps": 8,
"guidance_scale": 0.0,
"seed": 42,
"lora": {"name": "darkbrush", "path": "NagaSaiAbhinay/Krea-2-vllm-darkbrush-LoRA", "scale": 1.0}
}' | jq -r '.data[0].b64_json' | base64 -d > krea2_online.png
```
Cache-DiT acceleration (offline) — add `--cache-backend cache_dit`:
```bash
python examples/offline_inference/text_to_image/text_to_image.py \
--model krea/Krea-2-Turbo --prompt "a fox in the snow" \
--num-inference-steps 8 --guidance-scale 0.0 \
--cache-backend cache_dit --output krea2_cachedit.png
```
#### Verification
```bash
# Offline: the script prints "Saved generated image to <path>"; confirm the file exists.
ls -lh krea2_turbo.png
```
For the online route, decode the returned `b64_json` (see the `curl` above) and
confirm a valid 1024×1024 PNG is written.
#### Notes
- Key flags: distilled Turbo → few steps (~8) with `guidance_scale=0.0`; Raw →
more steps (~28) with `guidance_scale>0` (CFG). `guidance-scale` follows the
Krea 2 convention `velocity = cond + guidance_scale * (cond - uncond)`.
- LoRA: adapters must be PEFT format (`adapter_config.json` +
`adapter_model.safetensors`); the projections are `ReplicatedLinear`
(264 modules). Offline uses `--lora-path` (which sets
`OmniDiffusionSamplingParams.lora_request` / `lora_scale`); online uses the
top-level `lora` object. Style LoRAs like darkbrush need their trigger word in
the prompt.
- Cache-DiT is supported; `has_separate_cfg` is checkpoint-aware (False for Turbo
no-CFG, True for Raw CFG).
- Known limitations: TP / SP / CFG-Parallel are not yet wired for Krea 2. HSDP,
layerwise CPU offload, and VAE-patch-parallel (decode) are supported.
@@ -0,0 +1,155 @@
# SPDX-License-Identifier: Apache-2.0
# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
"""L4 functionality tests for the Krea 2 text-to-image diffusion pipeline (``Krea2Pipeline``).
Runs against the public few-step distilled checkpoint ``krea/Krea-2-Turbo`` by default (override with the
``KREA2_MODEL`` environment variable, e.g. ``krea/Krea-2-Raw`` for the Raw checkpoint or a local diffusers
directory). They cover a basic functional smoke plus the layerwise-CPU-offload path that the pipeline declares
via ``SupportsComponentDiscovery`` / ``_layerwise_offload_blocks_attrs``.
"""
import os
import numpy as np
import pytest
from tests.helpers.mark import hardware_test
from tests.helpers.runtime import OmniRunnerHandler
from vllm_omni.inputs.data import OmniDiffusionSamplingParams
from vllm_omni.lora.request import LoRARequest
from vllm_omni.lora.utils import stable_lora_int_id
MODEL = os.environ.get("KREA2_MODEL", "krea/Krea-2-Turbo")
# vLLM-Omni-compatible PEFT repackaging of krea/Krea-2-LoRA-darkbrush (264 modules, r=alpha=32).
LORA = os.environ.get("KREA2_LORA", "NagaSaiAbhinay/Krea-2-vllm-darkbrush-LoRA")
PROMPT = "a fox in the snow, photorealistic"
# darkbrush is a trigger-word LoRA: the trained monochrome ink-wash style only manifests when
# its trigger phrase is present, so the LoRA test prompt appends it for a strong, stable signal.
LORA_TRIGGER = "monochrome ink wash style"
LORA_PROMPT = f"a fox in the snow, {LORA_TRIGGER}"
pytestmark = [
pytest.mark.diffusion,
pytest.mark.full_model,
]
def _sampling() -> OmniDiffusionSamplingParams:
# Small resolution + few steps to keep the L4 case light. guidance_scale resolution is checkpoint-aware inside
# the pipeline (distilled -> no-CFG, Raw -> CFG), so this stays agnostic to which checkpoint KREA2_MODEL points at.
return OmniDiffusionSamplingParams(
height=512,
width=512,
num_inference_steps=8,
guidance_scale=0.0,
seed=42,
)
@hardware_test(res={"cuda": "H100"})
@pytest.mark.parametrize("omni_runner", [(MODEL, None)], indirect=True)
def test_krea2_text_to_image_001(omni_runner_handler: OmniRunnerHandler) -> None:
"""Basic functional smoke: a single prompt produces a decoded image."""
omni_runner_handler.send_diffusion_request({"model": MODEL, "prompt": PROMPT, "sampling_params": _sampling()})
@hardware_test(res={"cuda": "H100"})
@pytest.mark.parametrize(
"omni_runner",
[(MODEL, None, {"enable_layerwise_offload": True})],
indirect=True,
)
def test_krea2_layerwise_offload(omni_runner_handler: OmniRunnerHandler) -> None:
"""Exercise layerwise CPU offload on the DiT (SupportsComponentDiscovery + _layerwise_offload_blocks_attrs)."""
omni_runner_handler.send_diffusion_request({"model": MODEL, "prompt": PROMPT, "sampling_params": _sampling()})
@hardware_test(res={"cuda": "H100"})
@pytest.mark.cache
@pytest.mark.parametrize("omni_runner", [(MODEL, None, {"cache_backend": "cache_dit"})], indirect=True)
def test_krea2_cache_dit(omni_runner_handler: OmniRunnerHandler) -> None:
"""Exercise Cache-DiT on Krea 2 via the custom Krea2Pipeline enabler (``enable_cache_for_krea2``).
Validates the docs' Cache-DiT support claim for Krea 2. ``has_separate_cfg`` is checkpoint-aware
(False for the distilled Turbo no-CFG path, True for the Raw CFG path); the default Turbo checkpoint
exercises the no-CFG branch.
"""
omni_runner_handler.send_diffusion_request({"model": MODEL, "prompt": PROMPT, "sampling_params": _sampling()})
@hardware_test(res={"cuda": "H100"}, num_cards=2)
@pytest.mark.parametrize(
"omni_runner",
# Standalone HSDP: use_hsdp=True with an explicit hsdp_shard_size shards the DiT weights
# across 2 ranks (replicate_size defaults to 1 -> world_size = 1 * 2 = 2). HSDP must keep
# tensor_parallel_size/data_parallel_size at 1 (see vllm_omni/diffusion/data.py __post_init__).
# Also validated locally at 8 GPUs (hsdp_shard_size=8); CI shard provisions 2.
[(MODEL, None, {"use_hsdp": True, "hsdp_shard_size": 2})],
indirect=True,
)
def test_krea2_hsdp(omni_runner_handler: OmniRunnerHandler) -> None:
"""Exercise Hybrid Sharded Data Parallel (HSDP) weight sharding on the DiT across 2 GPUs.
Validates the docs' HSDP-support claim for Krea 2. Scheduled on the multi-GPU (distributed_cuda)
shard by ``num_cards=2``; skipped automatically on boxes with fewer than 2 CUDA devices.
"""
omni_runner_handler.send_diffusion_request({"model": MODEL, "prompt": PROMPT, "sampling_params": _sampling()})
@hardware_test(res={"cuda": "H100"}, num_cards=2)
@pytest.mark.parametrize(
"omni_runner",
# VAE patch-parallel decode: partition the VAE decode across the TP world. Mirrors the online
# "tp_vae_patch" case (tensor_parallel_size=2 + vae_patch_parallel_size=2) from the wan2.2/z-image
# expansion suites, so vae_patch_parallel_size must equal the world size established by TP.
# Also validated locally at 8 GPUs (tp=8, vae_patch=8); CI shard provisions 2.
[(MODEL, None, {"tensor_parallel_size": 2, "vae_patch_parallel_size": 2})],
indirect=True,
)
def test_krea2_vae_patch_parallel(omni_runner_handler: OmniRunnerHandler) -> None:
"""Exercise VAE patch-parallel (decode) across 2 GPUs.
Validates the docs' VAE-patch-parallel (decode) support claim for Krea 2. Scheduled on the
multi-GPU (distributed_cuda) shard by ``num_cards=2``; skipped automatically on boxes with
fewer than 2 CUDA devices.
"""
omni_runner_handler.send_diffusion_request({"model": MODEL, "prompt": PROMPT, "sampling_params": _sampling()})
def _generate(handler: OmniRunnerHandler, lora_request: LoRARequest | None, lora_scale: float = 1.0) -> np.ndarray:
sp = _sampling()
sp.lora_request = lora_request
sp.lora_scale = lora_scale
resp = handler.send_diffusion_request({"model": MODEL, "prompt": LORA_PROMPT, "sampling_params": sp})
return np.asarray(resp.images[0].convert("RGB"), dtype=np.int16)
@hardware_test(res={"cuda": "H100"})
@pytest.mark.parametrize("omni_runner", [(MODEL, None)], indirect=True)
def test_krea2_lora(omni_runner_handler: OmniRunnerHandler) -> None:
"""Validate diffusion LoRA on Krea 2: visible effect, scale sensitivity, clean deactivation.
Uses ``LORA`` (a vLLM-Omni-compatible PEFT repackaging of ``krea/Krea-2-LoRA-darkbrush``,
264 modules matched via the ReplicatedLinear projections) passed per-request through
``OmniDiffusionSamplingParams.lora_request`` / ``lora_scale`` — the same fields the
diffusion LoRA manager reads to activate/deactivate the adapter.
"""
lora_request = LoRARequest(lora_name="darkbrush", lora_int_id=stable_lora_int_id(LORA), lora_path=LORA)
baseline = _generate(omni_runner_handler, None)
img_1x = _generate(omni_runner_handler, lora_request, lora_scale=1.0)
img_2x = _generate(omni_runner_handler, lora_request, lora_scale=2.0)
restored = _generate(omni_runner_handler, None)
diff_1x = np.abs(baseline - img_1x).mean()
diff_2x = np.abs(baseline - img_2x).mean()
diff_restored = np.abs(baseline - restored).mean()
# (a) Adapter has a visible effect at both scales.
assert diff_1x > 0.5, f"LoRA scale=1.0 had no visible effect: diff={diff_1x}"
assert diff_2x > 0.5, f"LoRA scale=2.0 had no visible effect: diff={diff_2x}"
# (b) Scale changes the output (stronger adapter -> larger perturbation).
assert not np.isclose(diff_1x, diff_2x, atol=1.0), f"LoRA scale had no effect: 1x={diff_1x:.2f}, 2x={diff_2x:.2f}"
# (c) Passing lora_request=None cleanly deactivates: same seed -> back to baseline (modulo fp drift).
assert diff_restored < 5.0, f"LoRA did not deactivate cleanly: diff_restored={diff_restored:.2f}"
@@ -0,0 +1,152 @@
# SPDX-License-Identifier: Apache-2.0
# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
"""L4 online-serving tests for the Krea 2 text-to-image diffusion pipeline.
Exercises the OpenAI-compatible ``/v1/images/generations`` route (served via
``vllm serve <model> --omni --enforce-eager``) rather than the offline engine path
covered by ``tests/e2e/offline_inference/test_krea2_expansion.py``.
Runs against the public few-step distilled checkpoint ``krea/Krea-2-Turbo`` by default
(override with the ``KREA2_MODEL`` environment variable, e.g. ``krea/Krea-2-Raw`` for the
Raw checkpoint or a local diffusers directory). Krea 2 shares the Qwen-Image VAE and a
similar single-stream MMDiT, so this test mirrors the structure/fixtures/markers of
``test_qwen_image_expansion.py``.
Coverage mirrors the offline suite: a basic functional smoke plus the layerwise-CPU-offload
path that the pipeline declares via ``SupportsComponentDiscovery`` /
``_layerwise_offload_blocks_attrs``. Sizing is kept light (512x512, few steps) so the case
fits single-GPU H100 CI rather than the full 2048x2048 distilled resolution.
"""
import base64
import os
from io import BytesIO
import numpy as np
import pytest
import requests
from PIL import Image
from tests.helpers.mark import hardware_marks
from tests.helpers.runtime import OmniServer, OmniServerParams, OpenAIClientHandler, dummy_messages_from_mix_data
pytestmark = [pytest.mark.diffusion, pytest.mark.full_model]
MODEL = os.environ.get("KREA2_MODEL", "krea/Krea-2-Turbo")
# vLLM-Omni-compatible PEFT repackaging of krea/Krea-2-LoRA-darkbrush (264 modules, r=alpha=32).
LORA = os.environ.get("KREA2_LORA", "NagaSaiAbhinay/Krea-2-vllm-darkbrush-LoRA")
PROMPT = "a fox in the snow, photorealistic"
# darkbrush is a trigger-word LoRA; include its trigger phrase so the LoRA case has a strong signal.
LORA_PROMPT = "a fox in the snow, monochrome ink wash style"
SINGLE_CARD_FEATURE_MARKS = hardware_marks(res={"cuda": "H100"})
def _get_diffusion_feature_cases(model: str):
"""Return single-card L4 online-serving cases for Krea 2.
Mirrors the offline suite: a basic functional smoke plus layerwise CPU offload.
"""
return [
# Basic functional smoke (single-card).
pytest.param(
OmniServerParams(
model=model,
server_args=["--enforce-eager"],
),
id="single_card_basic",
marks=SINGLE_CARD_FEATURE_MARKS,
),
# Layerwise CPU offload (single-card): SupportsComponentDiscovery +
# _layerwise_offload_blocks_attrs.
pytest.param(
OmniServerParams(
model=model,
server_args=["--enforce-eager", "--enable-layerwise-offload"],
),
id="single_card_layerwise_offload",
marks=SINGLE_CARD_FEATURE_MARKS,
),
]
@pytest.mark.parametrize(
"omni_server",
_get_diffusion_feature_cases(MODEL),
indirect=True,
)
def test_krea2(omni_server: OmniServer, openai_client: OpenAIClientHandler):
"""Serve Krea 2 and validate the OpenAI-compatible image-generation route.
guidance_scale resolution is checkpoint-aware inside the pipeline (distilled -> no-CFG,
Raw -> CFG), so guidance_scale=0.0 stays agnostic to which checkpoint KREA2_MODEL points at.
Validation is delegated to assert_diffusion_response, which checks output dimensions and
basic correctness.
"""
messages = dummy_messages_from_mix_data(content_text=PROMPT)
request_config = {
"model": omni_server.model,
"messages": messages,
"extra_body": {
"height": 512,
"width": 512,
"num_inference_steps": 8,
"guidance_scale": 0.0,
"seed": 42,
},
}
openai_client.send_diffusion_request(request_config)
def _basic_lora_payload(lora: dict | None = None) -> dict:
payload = {
"prompt": LORA_PROMPT,
"n": 1,
"size": "512x512",
"num_inference_steps": 8,
"guidance_scale": 0.0,
"seed": 42,
}
if lora is not None:
payload["lora"] = lora
return payload
def _post_image(server: OmniServer, payload: dict) -> np.ndarray:
url = f"http://{server.host}:{server.port}/v1/images/generations"
resp = requests.post(url, json=payload, headers={"Authorization": "Bearer EMPTY"}, timeout=900)
resp.raise_for_status()
b64 = resp.json()["data"][0]["b64_json"]
img = Image.open(BytesIO(base64.b64decode(b64)))
img.load()
return np.asarray(img.convert("RGB"), dtype=np.int16)
@pytest.mark.parametrize(
"omni_server",
[
pytest.param(
OmniServerParams(model=MODEL, server_args=["--enforce-eager"]),
id="single_card_lora",
marks=SINGLE_CARD_FEATURE_MARKS,
)
],
indirect=True,
)
def test_krea2_lora(omni_server: OmniServer):
"""Serve Krea 2 and validate per-request LoRA over ``/v1/images/generations``.
Passes ``LORA`` via the top-level ``lora`` object (``{name, path, scale}``) the diffusion
image route parses into a ``LoRARequest`` — no server-side LoRA flag needed. Confirms the
adapter has a visible effect and that omitting ``lora`` cleanly restores the base output.
"""
baseline = _post_image(omni_server, _basic_lora_payload())
with_lora = _post_image(omni_server, _basic_lora_payload({"name": "darkbrush", "path": LORA, "scale": 1.0}))
restored = _post_image(omni_server, _basic_lora_payload())
diff_lora = np.abs(baseline - with_lora).mean()
diff_restored = np.abs(baseline - restored).mean()
assert diff_lora > 0.5, f"LoRA had no visible effect over the serving path: diff={diff_lora}"
assert diff_restored < 5.0, f"LoRA did not deactivate cleanly: diff_restored={diff_restored:.2f}"
@@ -56,6 +56,7 @@ EXCLUDED_MODELS = [
"NextStep11Pipeline",
"FluxPipeline",
"FluxDMD2Pipeline",
"Krea2Pipeline",
"QwenImageDMD2Pipeline",
"OmniGen2Pipeline",
"HeliosPipeline",
+33
View File
@@ -975,6 +975,38 @@ def enable_cache_for_cosmos3(pipeline: Any, cache_config: Any) -> RefreshCacheCo
return enable_cache_for_dit(pipeline, cache_config, block_adapter)
def enable_cache_for_krea2(pipeline: Any, cache_config: Any) -> RefreshCacheContextFunc:
"""Enable cache-dit for Krea 2.
Krea 2 is a single-stream MMDiT: each ``Krea2TransformerBlock`` takes and returns only
``hidden_states`` (text is fused into the token stream), so the blocks follow
``ForwardPattern.Pattern_3``.
``has_separate_cfg`` is checkpoint-dependent, which is why this needs a custom enabler
rather than a static ``_cache_dit_adapter_config``: the distilled Turbo checkpoint runs
no-CFG (a single transformer forward per denoise step), while the Raw checkpoint runs CFG
as two separate forwards. cache-dit tells cond/uncond apart purely by transformer-forward
parity, so the flag must match the actual per-step forward count — ``True`` only for the
CFG (Raw) path. The pipeline exposes this via ``is_distilled`` (read from ``model_index.json``).
Args:
pipeline: The Krea2Pipeline instance.
cache_config: DiffusionCacheConfig instance with cache configuration.
Returns:
A refresh function that can be called to update cache context with new num_inference_steps.
"""
transformer = default_get_pipeline_transformer(pipeline)
block_adapter = BlockAdapter(
transformer=transformer,
blocks=[transformer.transformer_blocks],
forward_pattern=[ForwardPattern.Pattern_3],
has_separate_cfg=not pipeline.is_distilled,
check_forward_pattern=False,
)
return enable_cache_for_dit(pipeline, cache_config, block_adapter)
# Register custom cache-dit enablers after function definitions
CUSTOM_DIT_ENABLERS.update(
{
@@ -984,6 +1016,7 @@ CUSTOM_DIT_ENABLERS.update(
"Wan22VACEPipeline": enable_cache_for_wan22,
"Wan22S2VPipeline": enable_cache_for_wan22_s2v,
"Cosmos3OmniDiffusersPipeline": enable_cache_for_cosmos3,
"Krea2Pipeline": enable_cache_for_krea2,
}
)
@@ -0,0 +1,15 @@
# SPDX-License-Identifier: Apache-2.0
# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
"""Krea 2 diffusion model components."""
from vllm_omni.diffusion.models.krea2.krea2_transformer import Krea2Transformer2DModel
from vllm_omni.diffusion.models.krea2.pipeline_krea2 import (
Krea2Pipeline,
get_krea2_post_process_func,
)
__all__ = [
"Krea2Pipeline",
"Krea2Transformer2DModel",
"get_krea2_post_process_func",
]
@@ -0,0 +1,571 @@
# SPDX-License-Identifier: Apache-2.0
# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
# Copyright 2026 Krea AI and The HuggingFace Team. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import math
from collections.abc import Iterable
from typing import TYPE_CHECKING
import torch
import torch.nn as nn
import torch.nn.functional as F
from diffusers.models.embeddings import apply_rotary_emb, get_1d_rotary_pos_embed
from vllm.logger import init_logger
from vllm.model_executor.layers.linear import ReplicatedLinear
from vllm.model_executor.model_loader.weight_utils import default_weight_loader
from vllm_omni.diffusion.attention.backends.abstract import AttentionMetadata
from vllm_omni.diffusion.attention.layer import Attention
if TYPE_CHECKING:
from vllm.model_executor.layers.quantization.base_config import QuantizationConfig
from vllm_omni.diffusion.data import OmniDiffusionConfig
logger = init_logger(__name__)
# Devices that do not support float64; RoPE frequencies fall back to float32 there.
_FP64_UNSUPPORTED_DEVICES = frozenset({"mps", "npu", "neuron"})
def _rope_freqs_dtype(device: torch.device) -> torch.dtype:
return torch.float32 if device.type in _FP64_UNSUPPORTED_DEVICES else torch.float64
def _join_prefix(prefix: str, name: str) -> str:
return f"{prefix}.{name}" if prefix else name
def _linear(
in_features: int,
out_features: int,
bias: bool,
quant_config: "QuantizationConfig | None",
prefix: str,
) -> ReplicatedLinear:
# ReplicatedLinear (not nn.Linear) so the diffusion LoRA manager can wrap these projections.
return ReplicatedLinear(
in_features,
out_features,
bias=bias,
quant_config=quant_config,
prefix=prefix,
return_bias=False,
)
class Krea2RMSNorm(nn.Module):
"""RMSNorm with a zero-centered scale: the effective multiplier is ``1 + weight``, matching the Krea 2 checkpoint
format. Activations are upcast so the normalization runs in float32."""
def __init__(self, dim: int, eps: float = 1e-5) -> None:
super().__init__()
self.dim = dim
self.eps = eps
self.weight = nn.Parameter(torch.zeros(dim))
def forward(self, hidden_states: torch.Tensor) -> torch.Tensor:
dtype = hidden_states.dtype
hidden_states = F.rms_norm(hidden_states.float(), (self.dim,), weight=self.weight + 1.0, eps=self.eps)
return hidden_states.to(dtype)
class Krea2Attention(nn.Module):
"""Self-attention with grouped-query projections, q/k RMSNorm, rotary embeddings and a sigmoid output gate.
Q/K/V layout is ``[B, seq, heads, head_dim]``; ``attention_mask`` is a 2D boolean key-padding mask
``(batch, key_seq_len)`` that the backend broadcasts.
"""
def __init__(
self,
hidden_size: int,
num_heads: int,
num_kv_heads: int | None = None,
eps: float = 1e-5,
role: str = "self",
quant_config: "QuantizationConfig | None" = None,
prefix: str = "",
) -> None:
super().__init__()
if hidden_size % num_heads != 0:
raise ValueError(f"hidden_size={hidden_size} must be divisible by num_heads={num_heads}")
self.hidden_size = hidden_size
self.num_heads = num_heads
self.num_kv_heads = num_kv_heads if num_kv_heads is not None else num_heads
self.head_dim = hidden_size // num_heads
q_dim = self.head_dim * self.num_heads
kv_dim = self.head_dim * self.num_kv_heads
self.to_q = _linear(hidden_size, q_dim, False, quant_config, _join_prefix(prefix, "to_q"))
self.to_k = _linear(hidden_size, kv_dim, False, quant_config, _join_prefix(prefix, "to_k"))
self.to_v = _linear(hidden_size, kv_dim, False, quant_config, _join_prefix(prefix, "to_v"))
self.to_gate = _linear(hidden_size, hidden_size, False, quant_config, _join_prefix(prefix, "to_gate"))
self.norm_q = Krea2RMSNorm(self.head_dim, eps=eps)
self.norm_k = Krea2RMSNorm(self.head_dim, eps=eps)
self.to_out = nn.ModuleList(
[_linear(hidden_size, hidden_size, False, quant_config, _join_prefix(prefix, "to_out.0")), nn.Dropout(0.0)]
)
self.attn = Attention(
num_heads=self.num_heads,
head_size=self.head_dim,
softmax_scale=1.0 / (self.head_dim**0.5),
causal=False,
num_kv_heads=self.num_kv_heads,
role=role,
)
def forward(
self,
hidden_states: torch.Tensor,
attention_mask: torch.Tensor | None = None,
image_rotary_emb: tuple[torch.Tensor, torch.Tensor] | None = None,
) -> torch.Tensor:
query = self.to_q(hidden_states).unflatten(-1, (self.num_heads, self.head_dim))
key = self.to_k(hidden_states).unflatten(-1, (self.num_kv_heads, self.head_dim))
value = self.to_v(hidden_states).unflatten(-1, (self.num_kv_heads, self.head_dim))
gate = self.to_gate(hidden_states)
query = self.norm_q(query)
key = self.norm_k(key)
if image_rotary_emb is not None:
query = apply_rotary_emb(query, image_rotary_emb, sequence_dim=1)
key = apply_rotary_emb(key, image_rotary_emb, sequence_dim=1)
query = query.to(value.dtype)
key = key.to(value.dtype)
attn_metadata = AttentionMetadata(attn_mask=attention_mask) if attention_mask is not None else None
hidden_states = self.attn(query, key, value, attn_metadata)
hidden_states = hidden_states.flatten(2, 3)
hidden_states = hidden_states * torch.sigmoid(gate)
return self.to_out[0](hidden_states)
class Krea2SwiGLU(nn.Module):
"""SwiGLU feed-forward network."""
def __init__(
self, dim: int, hidden_dim: int, quant_config: "QuantizationConfig | None" = None, prefix: str = ""
) -> None:
super().__init__()
self.gate = _linear(dim, hidden_dim, False, quant_config, _join_prefix(prefix, "gate"))
self.up = _linear(dim, hidden_dim, False, quant_config, _join_prefix(prefix, "up"))
self.down = _linear(hidden_dim, dim, False, quant_config, _join_prefix(prefix, "down"))
def forward(self, hidden_states: torch.Tensor) -> torch.Tensor:
return self.down(F.silu(self.gate(hidden_states)) * self.up(hidden_states))
class Krea2TextFusionBlock(nn.Module):
"""Pre-norm transformer block (no rotary embeddings, no time modulation) used by the text fusion stage."""
def __init__(
self,
dim: int,
num_heads: int,
num_kv_heads: int,
intermediate_size: int,
eps: float,
quant_config: "QuantizationConfig | None" = None,
prefix: str = "",
) -> None:
super().__init__()
self.norm1 = Krea2RMSNorm(dim, eps=eps)
self.norm2 = Krea2RMSNorm(dim, eps=eps)
self.attn = Krea2Attention(
dim,
num_heads,
num_kv_heads,
eps=eps,
role="self",
quant_config=quant_config,
prefix=_join_prefix(prefix, "attn"),
)
self.ff = Krea2SwiGLU(dim, intermediate_size, quant_config=quant_config, prefix=_join_prefix(prefix, "ff"))
def forward(self, hidden_states: torch.Tensor, attention_mask: torch.Tensor | None = None) -> torch.Tensor:
hidden_states = hidden_states + self.attn(self.norm1(hidden_states), attention_mask=attention_mask)
hidden_states = hidden_states + self.ff(self.norm2(hidden_states))
return hidden_states
class Krea2TextFusion(nn.Module):
"""Fuses the stack of tapped text-encoder hidden states into a single sequence of text features.
Two ``layerwise_blocks`` attend across the ``num_text_layers`` axis independently for every token, a linear
``projector`` collapses that axis, and two ``refiner_blocks`` attend across the token sequence.
"""
def __init__(
self,
num_text_layers: int,
dim: int,
num_heads: int,
num_kv_heads: int,
intermediate_size: int,
num_layerwise_blocks: int,
num_refiner_blocks: int,
eps: float,
quant_config: "QuantizationConfig | None" = None,
prefix: str = "",
) -> None:
super().__init__()
self.layerwise_blocks = nn.ModuleList(
[
Krea2TextFusionBlock(
dim,
num_heads,
num_kv_heads,
intermediate_size,
eps,
quant_config=quant_config,
prefix=_join_prefix(prefix, f"layerwise_blocks.{i}"),
)
for i in range(num_layerwise_blocks)
]
)
self.projector = _linear(num_text_layers, 1, False, quant_config, _join_prefix(prefix, "projector"))
self.refiner_blocks = nn.ModuleList(
[
Krea2TextFusionBlock(
dim,
num_heads,
num_kv_heads,
intermediate_size,
eps,
quant_config=quant_config,
prefix=_join_prefix(prefix, f"refiner_blocks.{i}"),
)
for i in range(num_refiner_blocks)
]
)
def forward(self, encoder_hidden_states: torch.Tensor, attention_mask: torch.Tensor | None = None) -> torch.Tensor:
batch_size, seq_len, num_text_layers, dim = encoder_hidden_states.shape
hidden_states = encoder_hidden_states.reshape(batch_size * seq_len, num_text_layers, dim)
for block in self.layerwise_blocks:
hidden_states = block(hidden_states.contiguous())
hidden_states = hidden_states.reshape(batch_size, seq_len, num_text_layers, dim).permute(0, 1, 3, 2)
hidden_states = self.projector(hidden_states).squeeze(-1)
for block in self.refiner_blocks:
hidden_states = block(hidden_states, attention_mask=attention_mask)
return hidden_states
class Krea2TransformerBlock(nn.Module):
def __init__(
self,
hidden_size: int,
intermediate_size: int,
num_heads: int,
num_kv_heads: int,
norm_eps: float,
quant_config: "QuantizationConfig | None" = None,
prefix: str = "",
) -> None:
super().__init__()
self.scale_shift_table = nn.Parameter(torch.zeros(6, hidden_size))
self.norm1 = Krea2RMSNorm(hidden_size, eps=norm_eps)
self.norm2 = Krea2RMSNorm(hidden_size, eps=norm_eps)
self.attn = Krea2Attention(
hidden_size,
num_heads,
num_kv_heads,
eps=norm_eps,
role="self",
quant_config=quant_config,
prefix=_join_prefix(prefix, "attn"),
)
self.ff = Krea2SwiGLU(
hidden_size, intermediate_size, quant_config=quant_config, prefix=_join_prefix(prefix, "ff")
)
def forward(
self,
hidden_states: torch.Tensor,
temb: torch.Tensor,
image_rotary_emb: tuple[torch.Tensor, torch.Tensor],
attention_mask: torch.Tensor | None = None,
) -> torch.Tensor:
# temb: (B, 1, 6 * hidden_size), shared across all blocks; each block only learns an additive table.
modulation = temb.unflatten(-1, (6, -1)) + self.scale_shift_table
prescale, preshift, pregate, postscale, postshift, postgate = modulation.unbind(-2)
attn_out = self.attn(
(1.0 + prescale) * self.norm1(hidden_states) + preshift,
attention_mask=attention_mask,
image_rotary_emb=image_rotary_emb,
)
hidden_states = hidden_states + pregate * attn_out
ff_out = self.ff((1.0 + postscale) * self.norm2(hidden_states) + postshift)
hidden_states = hidden_states + postgate * ff_out
return hidden_states
class Krea2TimestepEmbedding(nn.Module):
"""Sinusoidal flow-time embedding (cos-first, input scaled by 1000) followed by a two-layer MLP.
Keeps the sequence dimension at size 1 so the per-block modulations broadcast over tokens.
"""
def __init__(
self, embed_dim: int, hidden_size: int, quant_config: "QuantizationConfig | None" = None, prefix: str = ""
) -> None:
super().__init__()
self.embed_dim = embed_dim
self.linear_1 = _linear(embed_dim, hidden_size, True, quant_config, _join_prefix(prefix, "linear_1"))
self.linear_2 = _linear(hidden_size, hidden_size, True, quant_config, _join_prefix(prefix, "linear_2"))
def forward(self, timestep: torch.Tensor, dtype: torch.dtype) -> torch.Tensor:
half = self.embed_dim // 2
freqs = torch.exp(-math.log(1e4) * torch.arange(half, dtype=torch.float32, device=timestep.device) / half)
args = (timestep.float() * 1e3)[:, None, None] * freqs
emb = torch.cat([torch.cos(args), torch.sin(args)], dim=-1).to(dtype)
return self.linear_2(F.gelu(self.linear_1(emb), approximate="tanh"))
class Krea2TextProjection(nn.Module):
"""Projects the fused text features into the transformer width."""
def __init__(
self,
text_dim: int,
hidden_size: int,
eps: float,
quant_config: "QuantizationConfig | None" = None,
prefix: str = "",
) -> None:
super().__init__()
self.norm = Krea2RMSNorm(text_dim, eps=eps)
self.linear_1 = _linear(text_dim, hidden_size, True, quant_config, _join_prefix(prefix, "linear_1"))
self.linear_2 = _linear(hidden_size, hidden_size, True, quant_config, _join_prefix(prefix, "linear_2"))
def forward(self, hidden_states: torch.Tensor) -> torch.Tensor:
hidden_states = self.linear_1(self.norm(hidden_states))
return self.linear_2(F.gelu(hidden_states, approximate="tanh"))
class Krea2FinalLayer(nn.Module):
"""Final adaptive RMSNorm and output projection."""
def __init__(
self,
hidden_size: int,
out_channels: int,
eps: float,
quant_config: "QuantizationConfig | None" = None,
prefix: str = "",
) -> None:
super().__init__()
self.scale_shift_table = nn.Parameter(torch.zeros(2, hidden_size))
self.norm = Krea2RMSNorm(hidden_size, eps=eps)
self.linear = _linear(hidden_size, out_channels, True, quant_config, _join_prefix(prefix, "linear"))
def forward(self, hidden_states: torch.Tensor, temb: torch.Tensor) -> torch.Tensor:
modulation = temb + self.scale_shift_table
scale, shift = modulation.chunk(2, dim=1)
hidden_states = (1.0 + scale) * self.norm(hidden_states) + shift
return self.linear(hidden_states)
class Krea2RotaryPosEmbed(nn.Module):
"""Multi-axis (t, h, w) rotary position embedding, following the Flux/Krea 2 convention."""
def __init__(self, theta: int, axes_dim: list[int]):
super().__init__()
self.theta = theta
self.axes_dim = axes_dim
def forward(self, ids: torch.Tensor) -> tuple[torch.Tensor, torch.Tensor]:
n_axes = ids.shape[-1]
cos_out = []
sin_out = []
pos = ids.float()
freqs_dtype = _rope_freqs_dtype(ids.device)
for i in range(n_axes):
cos, sin = get_1d_rotary_pos_embed(
self.axes_dim[i],
pos[:, i],
theta=self.theta,
repeat_interleave_real=True,
use_real=True,
freqs_dtype=freqs_dtype,
)
cos_out.append(cos)
sin_out.append(sin)
freqs_cos = torch.cat(cos_out, dim=-1).to(ids.device)
freqs_sin = torch.cat(sin_out, dim=-1).to(ids.device)
return freqs_cos, freqs_sin
class Krea2Transformer2DModel(nn.Module):
r"""The single-stream MMDiT flow-matching backbone used by the Krea 2 pipeline (vLLM-Omni port).
Text conditioning enters as a stack of hidden states tapped from several layers of a multimodal text encoder. A
small text-fusion transformer collapses the layer axis and refines the token sequence; the result is concatenated
with the patchified image latents into a single ``[text, image]`` sequence processed by the transformer blocks.
The timestep conditions every block through one shared modulation vector plus per-block learned tables.
"""
_repeated_blocks = ["Krea2TransformerBlock"]
_layerwise_offload_blocks_attrs = ["transformer_blocks"]
@staticmethod
def _is_transformer_block(name: str, module) -> bool:
return "transformer_blocks" in name and name.split(".")[-1].isdigit()
_hsdp_shard_conditions = [_is_transformer_block]
def __init__(
self,
in_channels: int = 64,
num_layers: int = 28,
attention_head_dim: int = 128,
num_attention_heads: int = 48,
num_key_value_heads: int = 12,
intermediate_size: int = 16384,
timestep_embed_dim: int = 256,
text_hidden_dim: int = 2560,
num_text_layers: int = 12,
text_num_attention_heads: int = 20,
text_num_key_value_heads: int = 20,
text_intermediate_size: int = 6912,
num_layerwise_text_blocks: int = 2,
num_refiner_text_blocks: int = 2,
axes_dims_rope: tuple[int, int, int] = (32, 48, 48),
rope_theta: float = 1000.0,
norm_eps: float = 1e-5,
od_config: "OmniDiffusionConfig | None" = None,
quant_config: "QuantizationConfig | None" = None,
) -> None:
super().__init__()
# The pipeline reads ``self.dtype`` to cast inputs before the transformer forward.
self.dtype = od_config.dtype if od_config is not None else torch.get_default_dtype()
self.od_config = od_config
hidden_size = attention_head_dim * num_attention_heads
if sum(axes_dims_rope) != attention_head_dim:
raise ValueError(
f"sum(axes_dims_rope)={sum(axes_dims_rope)} must equal attention_head_dim={attention_head_dim}"
)
self.in_channels = in_channels
self.out_channels = in_channels
self.hidden_size = hidden_size
self.num_layers = num_layers
self.img_in = _linear(in_channels, hidden_size, True, quant_config, "img_in")
self.time_embed = Krea2TimestepEmbedding(timestep_embed_dim, hidden_size, quant_config, "time_embed")
self.time_mod_proj = _linear(hidden_size, 6 * hidden_size, True, quant_config, "time_mod_proj")
self.text_fusion = Krea2TextFusion(
num_text_layers=num_text_layers,
dim=text_hidden_dim,
num_heads=text_num_attention_heads,
num_kv_heads=text_num_key_value_heads,
intermediate_size=text_intermediate_size,
num_layerwise_blocks=num_layerwise_text_blocks,
num_refiner_blocks=num_refiner_text_blocks,
eps=norm_eps,
quant_config=quant_config,
prefix="text_fusion",
)
self.txt_in = Krea2TextProjection(text_hidden_dim, hidden_size, norm_eps, quant_config, "txt_in")
self.rotary_emb = Krea2RotaryPosEmbed(theta=rope_theta, axes_dim=list(axes_dims_rope))
self.transformer_blocks = nn.ModuleList(
[
Krea2TransformerBlock(
hidden_size=hidden_size,
intermediate_size=intermediate_size,
num_heads=num_attention_heads,
num_kv_heads=num_key_value_heads,
norm_eps=norm_eps,
quant_config=quant_config,
prefix=f"transformer_blocks.{i}",
)
for i in range(num_layers)
]
)
self.final_layer = Krea2FinalLayer(hidden_size, in_channels, norm_eps, quant_config, "final_layer")
def forward(
self,
hidden_states: torch.Tensor,
encoder_hidden_states: torch.Tensor,
timestep: torch.Tensor,
position_ids: torch.Tensor,
encoder_attention_mask: torch.Tensor | None = None,
) -> torch.Tensor:
r"""Predict the flow-matching velocity for the image tokens.
Args:
hidden_states: Packed (patchified) noisy image latents ``(batch, image_seq_len, in_channels)``.
encoder_hidden_states: Tapped text-encoder hidden states
``(batch, text_seq_len, num_text_layers, text_hidden_dim)``.
timestep: Flow-matching time in ``[0, 1]`` of shape ``(batch,)``.
position_ids: ``(t, h, w)`` rotary coordinates ``(text_seq_len + image_seq_len, 3)``.
encoder_attention_mask: Boolean mask marking valid text tokens ``(batch, text_seq_len)`` or ``None``.
"""
if position_ids.ndim != 2 or position_ids.shape[-1] != 3:
raise ValueError(f"`position_ids` must have shape (sequence_length, 3), got {tuple(position_ids.shape)}.")
batch_size, image_seq_len, _ = hidden_states.shape
temb = self.time_embed(timestep, dtype=hidden_states.dtype)
temb_mod = self.time_mod_proj(F.gelu(temb, approximate="tanh"))
# 2D key-padding masks: padded text tokens are excluded as keys; their lanes are dropped at the output slice.
text_attention_mask = None
attention_mask = None
if encoder_attention_mask is not None:
text_attention_mask = encoder_attention_mask.bool()
image_mask = text_attention_mask.new_ones((batch_size, image_seq_len))
attention_mask = torch.cat([text_attention_mask, image_mask], dim=1)
encoder_hidden_states = self.text_fusion(encoder_hidden_states, attention_mask=text_attention_mask)
encoder_hidden_states = self.txt_in(encoder_hidden_states)
text_seq_len = encoder_hidden_states.shape[1]
hidden_states = self.img_in(hidden_states)
hidden_states = torch.cat([encoder_hidden_states, hidden_states], dim=1)
image_rotary_emb = self.rotary_emb(position_ids)
for block in self.transformer_blocks:
hidden_states = block(hidden_states, temb_mod, image_rotary_emb, attention_mask)
hidden_states = hidden_states[:, text_seq_len:]
return self.final_layer(hidden_states, temb)
def load_weights(self, weights: Iterable[tuple[str, torch.Tensor]]) -> set[str]:
# Module/parameter names mirror the diffusers ``Krea2Transformer2DModel`` exactly, so weights map 1:1.
params_dict = dict(self.named_parameters())
loaded_params: set[str] = set()
for name, loaded_weight in weights:
if name not in params_dict:
continue
param = params_dict[name]
weight_loader = getattr(param, "weight_loader", default_weight_loader)
weight_loader(param, loaded_weight)
loaded_params.add(name)
return loaded_params
@@ -0,0 +1,551 @@
# SPDX-License-Identifier: Apache-2.0
# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
# Copyright 2026 Krea AI and The HuggingFace Team. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import inspect
import logging
import os
from collections.abc import Iterable
from typing import ClassVar
import numpy as np
import torch
from diffusers.image_processor import VaeImageProcessor
from diffusers.schedulers.scheduling_flow_match_euler_discrete import (
FlowMatchEulerDiscreteScheduler,
)
from diffusers.utils.torch_utils import randn_tensor
from torch import nn
from transformers import AutoTokenizer, Qwen3VLModel
from vllm.model_executor.models.utils import AutoWeightsLoader
from vllm.transformers_utils.config import get_hf_file_to_dict
from vllm_omni.diffusion.data import DiffusionOutput, OmniDiffusionConfig
from vllm_omni.diffusion.distributed.autoencoders.autoencoder_kl_qwenimage import DistributedAutoencoderKLQwenImage
from vllm_omni.diffusion.distributed.utils import get_local_device
from vllm_omni.diffusion.model_loader.diffusers_loader import DiffusersPipelineLoader
from vllm_omni.diffusion.model_loader.hub_prefetch import from_pretrained_with_prefetch, prefetch_subfolders
from vllm_omni.diffusion.models.interface import SupportsComponentDiscovery
from vllm_omni.diffusion.models.krea2.krea2_transformer import Krea2Transformer2DModel
from vllm_omni.diffusion.models.progress_bar import ProgressBarMixin
from vllm_omni.diffusion.profiler.diffusion_pipeline_profiler import DiffusionPipelineProfilerMixin
from vllm_omni.diffusion.request import OmniDiffusionRequest
from vllm_omni.diffusion.utils.tf_utils import get_transformer_config_kwargs
logger = logging.getLogger(__name__)
# Text-encoder layer taps used when model_index.json does not specify ``text_encoder_select_layers``.
DEFAULT_TEXT_ENCODER_SELECT_LAYERS = (2, 5, 8, 11, 14, 17, 20, 23, 26, 29, 32, 35)
def get_krea2_post_process_func(od_config: OmniDiffusionConfig):
model_name = od_config.model
# Read only the VAE config (``get_hf_file_to_dict`` resolves a local dir via
# ``Path(model)/file`` and a hub repo via a single-file download) instead of
# pulling all weights just to compute ``vae_scale_factor``.
vae_config = get_hf_file_to_dict("vae/config.json", model_name) or {}
vae_scale_factor = 2 ** len(vae_config["temperal_downsample"]) if "temperal_downsample" in vae_config else 8
patch_size = 2
try:
model_index = get_hf_file_to_dict("model_index.json", model_name) or {}
patch_size = int(model_index.get("patch_size", patch_size))
except Exception: # noqa: BLE001
pass
image_processor = VaeImageProcessor(vae_scale_factor=vae_scale_factor * patch_size)
def post_process_func(images: torch.Tensor):
return image_processor.postprocess(images)
return post_process_func
# Copied from diffusers.pipelines.flux.pipeline_flux.calculate_shift
def calculate_shift(
image_seq_len,
base_seq_len: int = 256,
max_seq_len: int = 4096,
base_shift: float = 0.5,
max_shift: float = 1.15,
):
m = (max_shift - base_shift) / (max_seq_len - base_seq_len)
b = base_shift - m * base_seq_len
mu = image_seq_len * m + b
return mu
# Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.retrieve_timesteps
def retrieve_timesteps(
scheduler,
num_inference_steps: int | None = None,
device: str | torch.device | None = None,
timesteps: list[int] | None = None,
sigmas: list[float] | None = None,
**kwargs,
) -> tuple[torch.Tensor, int]:
if timesteps is not None and sigmas is not None:
raise ValueError("Only one of `timesteps` or `sigmas` can be passed. Please choose one to set custom values")
if timesteps is not None:
accepts_timesteps = "timesteps" in set(inspect.signature(scheduler.set_timesteps).parameters.keys())
if not accepts_timesteps:
raise ValueError(
f"The current scheduler class {scheduler.__class__}'s `set_timesteps` does not support custom"
f" timestep schedules. Please check whether you are using the correct scheduler."
)
scheduler.set_timesteps(timesteps=timesteps, device=device, **kwargs)
timesteps = scheduler.timesteps
num_inference_steps = len(timesteps)
elif sigmas is not None:
accept_sigmas = "sigmas" in set(inspect.signature(scheduler.set_timesteps).parameters.keys())
if not accept_sigmas:
raise ValueError(
f"The current scheduler class {scheduler.__class__}'s `set_timesteps` does not support custom"
f" sigmas schedules. Please check whether you are using the correct scheduler."
)
scheduler.set_timesteps(sigmas=sigmas, device=device, **kwargs)
timesteps = scheduler.timesteps
num_inference_steps = len(timesteps)
else:
scheduler.set_timesteps(num_inference_steps, device=device, **kwargs)
timesteps = scheduler.timesteps
return timesteps, num_inference_steps
class Krea2Pipeline(nn.Module, DiffusionPipelineProfilerMixin, ProgressBarMixin, SupportsComponentDiscovery):
"""The Krea 2 text-to-image pipeline (vLLM-Omni port of ``diffusers.Krea2Pipeline``).
Components:
- ``scheduler``: ``FlowMatchEulerDiscreteScheduler`` (resolution-aware exponential time shift).
- ``vae``: the Qwen-Image VAE (f8, 16 latent channels).
- ``text_encoder``: a Qwen3-VL model; the pipeline consumes a stack of hidden states tapped from several
decoder layers rather than the last hidden state.
- ``tokenizer``: the tokenizer paired with the text encoder.
- ``transformer``: the Krea 2 single-stream MMDiT that predicts the flow-matching velocity.
"""
_dit_modules: ClassVar[list[str]] = ["transformer"]
_encoder_modules: ClassVar[list[str]] = ["text_encoder"]
_vae_modules: ClassVar[list[str]] = ["vae"]
_PROFILER_TARGETS: ClassVar[list[str]] = ["text_encoder.forward", "diffuse", "vae.decode"]
def __init__(self, *, od_config: OmniDiffusionConfig, prefix: str = ""):
super().__init__()
self.od_config = od_config
self.parallel_config = od_config.parallel_config
# Only the transformer goes through the standard weights loader; text encoder and VAE load eagerly below.
self.weights_sources = [
DiffusersPipelineLoader.ComponentSource(
model_or_path=od_config.model,
subfolder="transformer",
revision=od_config.revision,
prefix="transformer.",
fall_back_to_pt=True,
)
]
self.device = get_local_device()
model = od_config.model
local_files_only = os.path.isdir(model)
# Pipeline-level config lives in model_index.json, not the transformer config.
model_index = get_hf_file_to_dict("model_index.json", model) or {}
select_layers = model_index.get("text_encoder_select_layers") or DEFAULT_TEXT_ENCODER_SELECT_LAYERS
self.text_encoder_select_layers = tuple(int(i) for i in select_layers)
self.is_distilled = bool(model_index.get("is_distilled", False))
self.patch_size = int(model_index.get("patch_size", 2))
subfolders = ["scheduler", "text_encoder", "vae", "tokenizer"]
# See ``hub_prefetch.py`` for the transformers v5 subfolder race.
prefetch_subfolders(model, subfolders, local_files_only=local_files_only)
self.scheduler = FlowMatchEulerDiscreteScheduler.from_pretrained(
model, subfolder="scheduler", local_files_only=local_files_only
)
self.text_encoder = from_pretrained_with_prefetch(
Qwen3VLModel.from_pretrained,
model,
subfolder="text_encoder",
prefetch_list=subfolders,
local_files_only=local_files_only,
torch_dtype=od_config.dtype,
)
# Drop the unused Qwen3-VL vision tower before moving to GPU so it never consumes GPU memory.
if hasattr(self.text_encoder, "visual"):
del self.text_encoder.visual
else:
logger.warning("Krea2: vision tower not found on text encoder; skipping drop")
self.text_encoder = self.text_encoder.to(self.device)
self.vae = from_pretrained_with_prefetch(
DistributedAutoencoderKLQwenImage.from_pretrained,
model,
subfolder="vae",
prefetch_list=subfolders,
local_files_only=local_files_only,
torch_dtype=od_config.dtype,
).to(self.device)
transformer_kwargs = get_transformer_config_kwargs(od_config.tf_model_config, Krea2Transformer2DModel)
self.transformer = Krea2Transformer2DModel(
od_config=od_config, quant_config=od_config.quantization_config, **transformer_kwargs
)
self.tokenizer = AutoTokenizer.from_pretrained(model, subfolder="tokenizer", local_files_only=local_files_only)
self.vae_scale_factor = 2 ** len(self.vae.temperal_downsample) if getattr(self, "vae", None) else 8
self.image_processor = VaeImageProcessor(vae_scale_factor=self.vae_scale_factor * self.patch_size)
self.default_sample_size = 1024
# Chat template tokenized as a fixed-length block: prompt padded to a fixed length first, assistant suffix
# appended after the padding; the first ``prompt_template_encode_start_idx`` system tokens are later dropped.
self.prompt_template_encode_prefix = (
"<|im_start|>system\nDescribe the image by detailing the color, shape, size, texture, quantity, text, "
"spatial relationships of the objects and background:<|im_end|>\n<|im_start|>user\n"
)
self.prompt_template_encode_suffix = "<|im_end|>\n<|im_start|>assistant\n"
self.prompt_template_encode_start_idx = 34
self.prompt_template_encode_num_suffix_tokens = 5
self.setup_diffusion_pipeline_profiler(
enable_diffusion_pipeline_profiler=self.od_config.enable_diffusion_pipeline_profiler
)
def get_text_hidden_states(
self,
prompt: str | list[str],
max_sequence_length: int = 512,
device: torch.device | None = None,
) -> tuple[torch.Tensor, torch.Tensor]:
"""Tokenize ``prompt`` into the fixed-length Krea 2 layout and tap the selected encoder hidden states.
Returns ``(hidden_states, attention_mask)`` of shapes ``(batch, text_seq_len, num_text_layers,
text_hidden_dim)`` and ``(batch, text_seq_len)`` (bool).
"""
device = device or self.device
prompt = [prompt] if isinstance(prompt, str) else prompt
prefix_idx = self.prompt_template_encode_start_idx
text = [self.prompt_template_encode_prefix + e for e in prompt]
text_tokens = self.tokenizer(
text,
truncation=True,
padding="max_length",
max_length=max_sequence_length + prefix_idx - self.prompt_template_encode_num_suffix_tokens,
return_tensors="pt",
).to(device)
suffix_tokens = self.tokenizer([self.prompt_template_encode_suffix] * len(text), return_tensors="pt").to(device)
input_ids = torch.cat([text_tokens.input_ids, suffix_tokens.input_ids], dim=1)
attention_mask = torch.cat([text_tokens.attention_mask, suffix_tokens.attention_mask], dim=1).bool()
# Padding sits in the middle (``[prefix | prompt | PAD | suffix]``), so positions must count only real tokens
# (padding consumes no position). Broadcast across the 3 mRoPE axes (T/H/W equal for text).
position_ids = (attention_mask.long().cumsum(dim=-1) - 1).clamp(min=0)
position_ids = position_ids.unsqueeze(0).expand(3, -1, -1)
outputs = self.text_encoder(
input_ids=input_ids,
attention_mask=attention_mask,
position_ids=position_ids,
output_hidden_states=True,
)
hidden_states = torch.stack([outputs.hidden_states[i] for i in self.text_encoder_select_layers], dim=2)
hidden_states = hidden_states[:, prefix_idx:]
attention_mask = attention_mask[:, prefix_idx:]
return hidden_states, attention_mask
def encode_prompt(
self,
prompt: str | list[str],
device: torch.device | None = None,
num_images_per_prompt: int = 1,
prompt_embeds: torch.Tensor | None = None,
prompt_embeds_mask: torch.Tensor | None = None,
max_sequence_length: int = 512,
) -> tuple[torch.Tensor, torch.Tensor]:
device = device or self.device
if prompt_embeds is None:
prompt_embeds, prompt_embeds_mask = self.get_text_hidden_states(prompt, max_sequence_length, device)
batch_size, seq_len, num_text_layers, dim = prompt_embeds.shape
prompt_embeds = prompt_embeds.repeat(1, num_images_per_prompt, 1, 1)
prompt_embeds = prompt_embeds.view(batch_size * num_images_per_prompt, seq_len, num_text_layers, dim)
prompt_embeds_mask = prompt_embeds_mask.repeat(1, num_images_per_prompt)
prompt_embeds_mask = prompt_embeds_mask.view(batch_size * num_images_per_prompt, seq_len)
return prompt_embeds, prompt_embeds_mask
def _pack_latents(self, latents, batch_size, num_channels_latents, height, width):
p = self.patch_size
latents = latents.view(batch_size, num_channels_latents, height // p, p, width // p, p)
latents = latents.permute(0, 2, 4, 1, 3, 5)
latents = latents.reshape(batch_size, (height // p) * (width // p), num_channels_latents * p * p)
return latents
def _unpack_latents(self, latents, height, width):
batch_size, _, channels = latents.shape
p = self.patch_size
height = p * (int(height) // (self.vae_scale_factor * p))
width = p * (int(width) // (self.vae_scale_factor * p))
latents = latents.view(batch_size, height // p, width // p, channels // (p * p), p, p)
latents = latents.permute(0, 3, 1, 4, 2, 5)
latents = latents.reshape(batch_size, channels // (p * p), 1, height, width)
return latents
@staticmethod
def prepare_position_ids(text_seq_len: int, grid_height: int, grid_width: int, device: torch.device):
"""Build the ``(text_seq_len + grid_height * grid_width, 3)`` rotary coordinates: text tokens sit at the
origin, image tokens carry their ``(0, h, w)`` latent-grid coordinates."""
text_ids = torch.zeros(text_seq_len, 3, device=device)
image_ids = torch.zeros(grid_height, grid_width, 3, device=device)
image_ids[..., 1] = torch.arange(grid_height, device=device)[:, None]
image_ids[..., 2] = torch.arange(grid_width, device=device)[None, :]
image_ids = image_ids.reshape(grid_height * grid_width, 3)
return torch.cat([text_ids, image_ids], dim=0)
def prepare_latents(self, batch_size, num_channels_latents, height, width, dtype, device, generator, latents=None):
if latents is not None:
return latents.to(device=device, dtype=dtype)
latent_height = height // self.vae_scale_factor
latent_width = width // self.vae_scale_factor
shape = (batch_size, num_channels_latents, latent_height, latent_width)
if isinstance(generator, list) and len(generator) != batch_size:
raise ValueError(
f"You have passed a list of generators of length {len(generator)}, but requested an effective batch"
f" size of {batch_size}. Make sure the batch size matches the length of the generators."
)
latents = randn_tensor(shape, generator=generator, device=device, dtype=dtype)
latents = self._pack_latents(latents, batch_size, num_channels_latents, latent_height, latent_width)
return latents
def _extract_prompts(self, prompts):
"""Extract prompt and negative_prompt from the request's OmniPromptType list."""
prompt = [p if isinstance(p, str) else (p.get("prompt") or "") for p in prompts] or None
if all(isinstance(p, str) or p.get("negative_prompt") is None for p in prompts):
negative_prompt = None
elif prompts:
negative_prompt = ["" if isinstance(p, str) else (p.get("negative_prompt") or "") for p in prompts]
else:
negative_prompt = None
return prompt, negative_prompt
@property
def do_classifier_free_guidance(self):
return self._guidance_scale > 0
def diffuse(
self,
latents: torch.Tensor,
timesteps: torch.Tensor,
position_ids: torch.Tensor,
prompt_embeds: torch.Tensor,
prompt_embeds_mask: torch.Tensor,
negative_prompt_embeds: torch.Tensor | None,
negative_prompt_embeds_mask: torch.Tensor | None,
guidance_scale: float,
) -> torch.Tensor:
"""Run the flow-matching denoising loop and return the final latents."""
self.scheduler.set_begin_index(0)
transformer_dtype = self.transformer.dtype
with self.progress_bar(total=len(timesteps)) as progress_bar:
for _, t in enumerate(timesteps):
timestep = (t / self.scheduler.config.num_train_timesteps).expand(latents.shape[0])
timestep = timestep.to(transformer_dtype)
latent_input = latents.to(transformer_dtype)
noise_pred = self.transformer(
hidden_states=latent_input,
encoder_hidden_states=prompt_embeds.to(transformer_dtype),
timestep=timestep,
position_ids=position_ids,
encoder_attention_mask=prompt_embeds_mask,
)
if self.do_classifier_free_guidance:
neg_noise_pred = self.transformer(
hidden_states=latent_input,
encoder_hidden_states=negative_prompt_embeds.to(transformer_dtype),
timestep=timestep,
position_ids=position_ids,
encoder_attention_mask=negative_prompt_embeds_mask,
)
noise_pred = noise_pred + guidance_scale * (noise_pred - neg_noise_pred)
latents = self.scheduler.step(noise_pred, t, latents, return_dict=False)[0]
progress_bar.update()
return latents
def forward(
self,
req: OmniDiffusionRequest,
prompt: str | list[str] | None = None,
negative_prompt: str | list[str] | None = None,
height: int = 1024,
width: int = 1024,
num_inference_steps: int = 28,
sigmas: list[float] | None = None,
guidance_scale: float = 4.5,
num_images_per_prompt: int = 1,
generator: torch.Generator | list[torch.Generator] | None = None,
latents: torch.Tensor | None = None,
output_type: str | None = "pil",
max_sequence_length: int = 512,
) -> DiffusionOutput:
extracted_prompt, extracted_negative = self._extract_prompts(req.prompts)
prompt = extracted_prompt or prompt
if extracted_negative is not None:
negative_prompt = extracted_negative
sp = req.sampling_params
height = sp.height or height
width = sp.width or width
num_inference_steps = sp.num_inference_steps or num_inference_steps
sigmas = sp.sigmas or sigmas
max_sequence_length = sp.max_sequence_length or max_sequence_length
generator = sp.generator or generator
if sp.guidance_scale_provided:
guidance_scale = sp.guidance_scale
else:
# Distilled checkpoint is trained guidance-free (and the request layer coerces an explicit
# guidance_scale=0 to "not provided"), so default it to no CFG.
guidance_scale = 0.0 if self.is_distilled else guidance_scale
num_images_per_prompt = sp.num_outputs_per_prompt if sp.num_outputs_per_prompt > 0 else num_images_per_prompt
multiple = self.vae_scale_factor * self.patch_size
if height % multiple != 0 or width % multiple != 0:
rounded_height = ((height + multiple - 1) // multiple) * multiple
rounded_width = ((width + multiple - 1) // multiple) * multiple
logger.warning(
"`height` and `width` must be multiples of %d; rounding up from %dx%d to %dx%d.",
multiple,
height,
width,
rounded_height,
rounded_width,
)
height, width = rounded_height, rounded_width
device = self.device
self._guidance_scale = guidance_scale
if prompt is not None and isinstance(prompt, str):
batch_size = 1
elif prompt is not None and isinstance(prompt, list):
batch_size = len(prompt)
else:
batch_size = 1
prompt_embeds, prompt_embeds_mask = self.encode_prompt(
prompt=prompt,
device=device,
num_images_per_prompt=num_images_per_prompt,
max_sequence_length=max_sequence_length,
)
negative_prompt_embeds = None
negative_prompt_embeds_mask = None
if self.do_classifier_free_guidance:
if negative_prompt is None:
negative_prompt = ""
if isinstance(negative_prompt, str):
negative_prompt = [negative_prompt] * batch_size
negative_prompt_embeds, negative_prompt_embeds_mask = self.encode_prompt(
prompt=negative_prompt,
device=device,
num_images_per_prompt=num_images_per_prompt,
max_sequence_length=max_sequence_length,
)
num_channels_latents = self.transformer.in_channels // (self.patch_size**2)
latents = self.prepare_latents(
batch_size * num_images_per_prompt,
num_channels_latents,
height,
width,
prompt_embeds.dtype,
device,
generator,
latents,
)
grid_height = height // (self.vae_scale_factor * self.patch_size)
grid_width = width // (self.vae_scale_factor * self.patch_size)
position_ids = self.prepare_position_ids(prompt_embeds.shape[1], grid_height, grid_width, device)
sigmas = np.linspace(1.0, 1 / num_inference_steps, num_inference_steps) if sigmas is None else sigmas
image_seq_len = latents.shape[1]
if self.is_distilled:
mu = 1.15
else:
mu = calculate_shift(
image_seq_len,
self.scheduler.config.get("base_image_seq_len", 256),
self.scheduler.config.get("max_image_seq_len", 6400),
self.scheduler.config.get("base_shift", 0.5),
self.scheduler.config.get("max_shift", 1.15),
)
timesteps, num_inference_steps = retrieve_timesteps(
self.scheduler, num_inference_steps, device, sigmas=sigmas, mu=mu
)
latents = self.diffuse(
latents=latents,
timesteps=timesteps,
position_ids=position_ids,
prompt_embeds=prompt_embeds,
prompt_embeds_mask=prompt_embeds_mask,
negative_prompt_embeds=negative_prompt_embeds,
negative_prompt_embeds_mask=negative_prompt_embeds_mask,
guidance_scale=guidance_scale,
)
if output_type == "latent":
image = latents
else:
latents = self._unpack_latents(latents, height, width)
latents = latents.to(self.vae.dtype)
latents_mean = (
torch.tensor(self.vae.config.latents_mean)
.view(1, self.vae.config.z_dim, 1, 1, 1)
.to(latents.device, latents.dtype)
)
latents_std = 1.0 / torch.tensor(self.vae.config.latents_std).view(1, self.vae.config.z_dim, 1, 1, 1).to(
latents.device, latents.dtype
)
latents = latents / latents_std + latents_mean
image = self.vae.decode(latents, return_dict=False)[0][:, :, 0]
return DiffusionOutput(
output=image,
stage_durations=self.stage_durations if hasattr(self, "stage_durations") else None,
)
def load_weights(self, weights: Iterable[tuple[str, torch.Tensor]]) -> set[str]:
loader = AutoWeightsLoader(self)
loaded_weights = loader.load_weights(weights)
# VAE and text encoder load eagerly in __init__; record their params so strict load checks pass.
loaded_weights |= {f"vae.{name}" for name, _ in self.vae.named_parameters()}
if self.text_encoder is not None:
loaded_weights |= {f"text_encoder.{name}" for name, _ in self.text_encoder.named_parameters()}
return loaded_weights
+6
View File
@@ -306,6 +306,11 @@ _DIFFUSION_MODELS = {
"pipeline_sdxl",
"StableDiffusionXLPipeline",
),
"Krea2Pipeline": (
"krea2",
"pipeline_krea2",
"Krea2Pipeline",
),
}
@@ -533,6 +538,7 @@ _DIFFUSION_POST_PROCESS_FUNCS = {
"Cosmos3OmniDiffusersPipeline": "get_cosmos3_post_process_func",
"HiDreamImagePipeline": "get_hidream_image_post_process_func",
"StableDiffusionXLPipeline": "get_sdxl_image_post_process_func",
"Krea2Pipeline": "get_krea2_post_process_func",
}
_DIFFUSION_ACTION_POST_PROCESS_FUNCS = {