BUG: is_array_api_obj(np.matrix(...)) == True

(Pdb) A.A
matrix([[1, 2, 3],
        [4, 5, 6]], dtype=int32)
(Pdb) scipy._external.array_api_compat.is_array_api_obj(A.A)
True

@ev-br

also

(Pdb) scipy._external.array_api_compat.is_numpy_array(A.A)
True

it looks like we are deliberately accepting np.ndarray subclasses, but I think we should special case rejecting np.matrix as a known bad-case. WDYT @ev-br ?

Ouch. Reject all ndarray subclasses, I'd say? Maybe , just maybe, whitelist np.memmap. actually not even that, not until someone checks it, someone who uses it (scikit-learn?). Other than memmap, just plain ndarray /whatever is needed for numpy scalars , np.generic.

could you send a PR or would you prefer to review?

Feel free to beat me up sending the PR :-).

Sent a fix in gh-423, could you double-check it fixes the issue for you Lucas?

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BUG: `is_array_api_obj(np.matrix(...)) == True` #388

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BUG: is_array_api_obj(np.matrix(...)) == True #388

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lucascolley commented on Feb 11, 2026

ev-br commented on Feb 11, 2026

lucascolley commented on Feb 11, 2026

ev-br commented on Feb 12, 2026

ev-br commented on Apr 28, 2026

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BUG: `is_array_api_obj(np.matrix(...)) == True` #388