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[trainer] fix: Import flash attn utils for Transformers higher than 4.55.0 #3596

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Merged
vermouth1992 merged 3 commits into from
Sep 24, 2025
+9 −1
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[trainer] fix: Import flash attn utils for Transformers higher than 4.55.0 #3596

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Import the index_first_axis, pad_input, unpad_input, etc in a differe…
Sep 24, 2025
543402f
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ji-huazhong Sep 24, 2025
455073c
more fix
ji-huazhong Sep 24, 2025
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10 changes: 9 additions & 1 deletion verl/workers/actor/dp_actor.py
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Original file line number Diff line number Diff line change
Expand Up @@ -40,7 +40,15 @@
if is_cuda_available:
from flash_attn.bert_padding import index_first_axis, pad_input, rearrange, unpad_input
elif is_npu_available:
from transformers.integrations.npu_flash_attention import index_first_axis, pad_input, rearrange, unpad_input
try:
from transformers.integrations.npu_flash_attention import index_first_axis, pad_input, rearrange, unpad_input
except ImportError:
# Since transformers v4.55.1, index_first_axis, pad_input, and unpad_input
# have been consolidated into `transformers.modeling_flash_attention_utils`.
from einops import rearrange
from transformers.modeling_flash_attention_utils import _index_first_axis as index_first_axis
from transformers.modeling_flash_attention_utils import _pad_input as pad_input
from transformers.modeling_flash_attention_utils import _unpad_input as unpad_input


__all__ = ["DataParallelPPOActor"]
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