BUG: Return correctly shaped inverse indices in array_api set functions #20819
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Specifically for `xp.unique_all()` and `xp.unique_inverse()`
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Backport of #20791.
As inverse indices from
np.unique()are flattened whenaxis=None(the default), the relatedarray_apiset functions (xp.unique_inverse/xp.unique_all) don't return shape-sharing indices as the Array API specifies. This PR fixes this by internally reshaping the inverse indices.Tested in array-api-tests , specifically https://github.com/data-apis/array-api-tests/blob/master/array_api_tests/test_set_functions.py. Note these tests will fail due to unrelated NaN-uniqueness issues.
Related #20638