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3 changes: 2 additions & 1 deletion src/transformers/integrations/sdpa_attention.py
Original file line number Diff line number Diff line change
Expand Up @@ -42,8 +42,9 @@ def sdpa_attention_forward(

# We dispatch to SDPA's Flash Attention or Efficient kernels via this `is_causal` if statement instead of an inline conditional assignment
# in SDPA to support both torch.compile's dynamic shapes and full graph options. An inline conditional prevents dynamic shapes from compiling.
# Note that it is important to check first for the shape, otherwise compile will fail with `argument 'is_causal' must be bool, not SymBool`
if is_causal is None:
is_causal = causal_mask is None and query.shape[2] > 1
is_causal = query.shape[2] > 1 and causal_mask is None

# Shapes (e.g. query.shape[2]) are tensors during jit tracing, resulting in `is_causal` being a tensor.
# We convert it to a bool for the SDPA kernel that only accepts bools.
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