84bbd57e4d
Signed-off-by: zhuhh97 <zhuhonghan@huawei.com> Signed-off-by: dph97 <nenbaying@163.com> Signed-off-by: zhuhh97 <zhh@unknown> Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com> Co-authored-by: dengyunyang <584797741@qq.com>
96 lines
3.5 KiB
Python
96 lines
3.5 KiB
Python
# SPDX-License-Identifier: Apache-2.0
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# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
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from __future__ import annotations
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from vllm.logger import init_logger
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from vllm_omni.diffusion.attention.parallel.allgather_kv import (
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AllGatherKVParallelAttention,
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)
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from vllm_omni.diffusion.attention.parallel.base import (
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NoParallelAttention,
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ParallelAttentionStrategy,
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)
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from vllm_omni.diffusion.attention.parallel.ring import RingParallelAttention
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from vllm_omni.diffusion.attention.parallel.ulysses import UlyssesParallelAttention
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from vllm_omni.diffusion.distributed.parallel_state import (
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get_sequence_parallel_world_size,
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get_sp_group,
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)
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from vllm_omni.diffusion.forward_context import get_forward_context
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logger = init_logger(__name__)
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def build_parallel_attention_strategy(
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*,
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scatter_idx: int,
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gather_idx: int,
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use_sync: bool,
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causal: bool = False,
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) -> ParallelAttentionStrategy:
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"""Select a parallel attention strategy based on current diffusion config.
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Design principle:
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- Attention kernel backend selection remains in `attention/selector.py`.
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- Parallel attention selection is handled here, based on distributed config
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and initialized process groups.
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"""
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try:
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cfg = get_forward_context().omni_diffusion_config
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p = cfg.parallel_config
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except Exception as e:
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logger.debug(f"No forward context available for parallel attention strategy: {e}")
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return NoParallelAttention()
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ulysses_degree = getattr(p, "ulysses_degree", 1)
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ring_degree = getattr(p, "ring_degree", 1)
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allgather_degree = getattr(p, "allgather_degree", 1)
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try:
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sp_group = get_sp_group()
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# Ensure SP group is initialized and world size > 1
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if get_sequence_parallel_world_size() <= 1:
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return NoParallelAttention()
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except Exception as e:
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# Log warning if SP is configured but group is not available
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if ulysses_degree > 1 or ring_degree > 1 or allgather_degree > 1:
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logger.warning(
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f"SP configured (ulysses={ulysses_degree}, ring={ring_degree}, "
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f"allgather={allgather_degree}) but SP group not available: {e}. "
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f"Falling back to NoParallelAttention. This may cause incorrect results."
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)
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return NoParallelAttention()
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if allgather_degree > 1:
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if causal:
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raise ValueError("AllGather-KV SP only supports non-causal attention.")
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if ulysses_degree > 1 or ring_degree > 1:
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raise ValueError(
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f"AllGather-KV SP is mutually exclusive with Ulysses/Ring in v1 "
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f"(got ulysses_degree={ulysses_degree}, ring_degree={ring_degree}, "
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f"allgather_degree={allgather_degree})."
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)
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logger.debug(f"Using AllGatherKVParallelAttention (allgather_degree={allgather_degree})")
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return AllGatherKVParallelAttention(sp_group=sp_group)
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# Ulysses (or Hybrid Ulysses+Ring)
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if ulysses_degree > 1:
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logger.debug(f"Using UlyssesParallelAttention (ulysses_degree={ulysses_degree})")
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return UlyssesParallelAttention(
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sp_group=sp_group,
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scatter_idx=scatter_idx,
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gather_idx=gather_idx,
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use_sync=use_sync,
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)
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# Pure Ring Attention
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if ring_degree > 1:
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logger.debug(f"Using RingParallelAttention (ring_degree={ring_degree})")
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return RingParallelAttention(
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sp_group=sp_group,
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)
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return NoParallelAttention()
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