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Fix AttributeError on s_aux=None in flash_attention_forward #45589

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Merged
ArthurZucker merged 1 commit into from
Apr 23, 2026
+5 −1
Merged

Fix AttributeError on s_aux=None in flash_attention_forward #45589

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6 changes: 5 additions & 1 deletion src/transformers/integrations/flash_attention.py
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Original file line number Diff line number Diff line change
Expand Up @@ -81,7 +81,11 @@ def flash_attention_forward(
target_dtype=target_dtype,
attn_implementation=module.config._attn_implementation,
layer_idx=module.layer_idx if hasattr(module, "layer_idx") else None,
s_aux=s_aux.to(query.dtype), # FA only accepts half precision
s_aux=(
s_aux.to(query.dtype) # FA only accepts half precision
if s_aux is not None
else None
),
**kwargs,
)

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