catcatandHongsheng Liu
026f613e57
Signed-off-by: iwzbi <wzbi@zju.edu.cn> Signed-off-by: Hongsheng Liu <liuhongsheng4@huawei.com> Co-authored-by: Hongsheng Liu <liuhongsheng4@huawei.com>
59 lines
1.9 KiB
Python
59 lines
1.9 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_omni.diffusion.attention.parallel.base import NoParallelAttention, ParallelAttentionStrategy
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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 get_sequence_parallel_world_size, get_sp_group
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from vllm_omni.diffusion.forward_context import get_forward_context
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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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) -> 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:
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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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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:
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return NoParallelAttention()
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# Ulysses (or Hybrid Ulysses+Ring)
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if ulysses_degree > 1:
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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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return RingParallelAttention(
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sp_group=sp_group,
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)
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return NoParallelAttention()
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