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[Pallas] Better error message for grid/dimension semantics mismatch. #33049

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Nov 3, 2025
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[Pallas] Better error message for grid/dimension semantics mismatch. #33049

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3 changes: 2 additions & 1 deletion jax/_src/pallas/mosaic/lowering.py
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Original file line number Diff line number Diff line change
Expand Up @@ -472,7 +472,8 @@ def __init__(
)
if len(user_grid) != len(dimension_semantics):
raise ValueError(
"Must have dimension semantics for each dimension of the grid."
"Length of grid does not match length of dimension semantics."
f" len(grid)={len(user_grid)}, {len(dimension_semantics)=}"
)
assert len(self.vmapped_dims) + len(dimension_semantics) == len(
self.grid
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