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Fix ConcretizationTypeError in dot_product_attention with traced masks #21853

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Abhinavexists wants to merge 5 commits into from
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Fix ConcretizationTypeError in dot_product_attention with traced masks #21853

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bc319e2
Disable flash attention for traced masks
Abhinavexists Nov 15, 2025
a6b65a4
Update keras/src/backend/jax/nn.py
Abhinavexists Nov 15, 2025
862c271
Update keras/src/backend/jax/nn.py
Abhinavexists Nov 15, 2025
ffc4bd6
Fix flash attention handling for TPU with masks
Abhinavexists Nov 26, 2025
1dfcaca
removed duplicate flash_attention = 'False'
Abhinavexists Dec 2, 2025
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5 changes: 4 additions & 1 deletion keras/src/backend/jax/nn.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1353,7 +1353,10 @@ def dot_product_attention(
)
# Transpose output back to Keras layout
return jnp.transpose(output, axes=(0, 2, 1, 3))
except Exception:
except jax.errors.ConcretizationTypeError:
# Mask is traced
# Fall back to native attention
flash_attention = False
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@hertschuh hertschuh Dec 1, 2025

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flash_attention = False

This is already line 1364, remove.

logging.exception(
"Failed to apply Splash kernel for flash attention. "
"Falling back to JAX native dot_product_attention."
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