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[Data] Fix bug where you can't return objects and array from UDF #45287

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merged 2 commits into from
May 13, 2024

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@bveeramani bveeramani commented May 13, 2024

Why are these changes needed?

If you try to return arbitrary objects and arrays from a UDF, Ray Data errors complaining that "per-column arrays must each be 1-dimensional." The issue is that when Ray Data falls back to pandas, it doesn't use the tensor extension type. This PR fixes the bug.

Related issue number

Fixes #45235

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  • I've run scripts/format.sh to lint the changes in this PR.
  • I've included any doc changes needed for https://docs.ray.io/en/master/.
    • I've added any new APIs to the API Reference. For example, if I added a
      method in Tune, I've added it in doc/source/tune/api/ under the
      corresponding .rst file.
  • I've made sure the tests are passing. Note that there might be a few flaky tests, see the recent failures at https://flakey-tests.ray.io/
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    • This PR is not tested :(

Signed-off-by: Balaji Veeramani <[email protected]>
Signed-off-by: Balaji Veeramani <[email protected]>
@@ -185,22 +185,14 @@ def from_bytes(cls, data: bytes) -> "ArrowBlockAccessor":

@staticmethod
def numpy_to_block(
batch: Union[np.ndarray, Dict[str, np.ndarray], Dict[str, list]],
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We don't directly pass ndarrays to this method anywhere in the codebase.

@bveeramani bveeramani merged commit 07f8185 into ray-project:master May 13, 2024
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@bveeramani bveeramani deleted the fix-map-objects-pandas branch May 13, 2024 02:33
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[Data] Can't return array-like data from UDF if batch contains unsupported type
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