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Tolerate missing @torch.library.custom_op (#7234)

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This can happen on Pytorch versions older than 2.4.
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FeepingCreature 2025-03-14 14:51:26 +01:00 committed by GitHub
parent 7aceb9f91c
commit 9c98c6358b
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1 changed files with 15 additions and 8 deletions
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7
comfy/ldm/modules/attention.py
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@ -503,6 +503,7 @@ def attention_sage(q, k, v, heads, mask=None, attn_precision=None, skip_reshape=
return out
try:
@torch.library.custom_op("flash_attention::flash_attn", mutates_args=())
def flash_attn_wrapper(q: torch.Tensor, k: torch.Tensor, v: torch.Tensor,
dropout_p: float = 0.0, causal: bool = False) -> torch.Tensor:
@ -513,6 +514,12 @@ def flash_attn_wrapper(q: torch.Tensor, k: torch.Tensor, v: torch.Tensor,
def flash_attn_fake(q, k, v, dropout_p=0.0, causal=False):
# Output shape is the same as q
return q.new_empty(q.shape)
except AttributeError as error:
FLASH_ATTN_ERROR = error
def flash_attn_wrapper(q: torch.Tensor, k: torch.Tensor, v: torch.Tensor,
dropout_p: float = 0.0, causal: bool = False) -> torch.Tensor:
assert False, f"Could not define flash_attn_wrapper: {FLASH_ATTN_ERROR}"
def attention_flash(q, k, v, heads, mask=None, attn_precision=None, skip_reshape=False, skip_output_reshape=False):