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[performance_optim] reduce frequency of declaring attention_mask in Ascend NPU flash attention (#38278)

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[performance_optim] reduce frequency of declaring attention_mask in ASCEND NPU flash attention
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Zhen 2025-05-23 23:24:51 +08:00 committed by GitHub
parent f5d45d89c4
commit 3c289e2104
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1 changed files with 10 additions and 4 deletions
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14
src/transformers/integrations/npu_flash_attention.py
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@ -37,6 +37,8 @@ if SPARSE_MODE not in [TOP_LEFT_ALIGNED_CAUSAL_MASK_MODE, DOWN_RIGHT_ALIGNED_CAU
"or 3 (down-right aligned causal mask)."
)
ATTN_MASK_NPU = None
def is_npu_fa2_top_left_aligned_causal_mask():
return SPARSE_MODE == TOP_LEFT_ALIGNED_CAUSAL_MASK_MODE if is_torch_npu_available() else False
@ -171,7 +173,9 @@ def npu_flash_attn_func(
head_num = q.shape[2]
output = torch_npu.npu_fusion_attention(q, k, v, head_num, "BSND", keep_prob=keep_prob, scale=softmax_scale)[0]
else:
attn_mask_npu = torch.triu(torch.ones([2048, 2048], device=q.device), diagonal=1).bool()
global ATTN_MASK_NPU
if ATTN_MASK_NPU is None:
ATTN_MASK_NPU = torch.triu(torch.ones([2048, 2048], device=q.device), diagonal=1).bool()
head_num = q.shape[2]
output = torch_npu.npu_fusion_attention(
q,
@ -181,7 +185,7 @@ def npu_flash_attn_func(
"BSND",
keep_prob=keep_prob,
scale=softmax_scale,
atten_mask=attn_mask_npu,
atten_mask=ATTN_MASK_NPU,
sparse_mode=SPARSE_MODE,
)[0]
@ -222,7 +226,9 @@ def npu_flash_attn_varlen_func(
actual_seq_kvlen=tuple(cu_seqlens_k[1:].cpu().numpy().tolist()),
)[0]
else:
attn_mask_npu = torch.triu(torch.ones([2048, 2048], device=q.device), diagonal=1).bool()
global ATTN_MASK_NPU
if ATTN_MASK_NPU is None:
ATTN_MASK_NPU = torch.triu(torch.ones([2048, 2048], device=q.device), diagonal=1).bool()
head_num = q.shape[1]
output = torch_npu.npu_fusion_attention(
q,
@ -231,7 +237,7 @@ def npu_flash_attn_varlen_func(
head_num,
pse=None,
padding_mask=None,
atten_mask=attn_mask_npu,
atten_mask=ATTN_MASK_NPU,
scale=softmax_scale,
keep_prob=keep_prob,
input_layout="TND",