array API: add empty, empty_like (pure aliases), astype, matrix_transpose#3729
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katlun-lgtm
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empty/empty_like are pure aliases of zeros/zeros_like via
m.attr("empty") = m.attr("zeros"), matching the pattern from ml-explore#3678.
MLX does not expose uninitialized memory so zeros is the correct
semantic match.
astype exposes mx::astype as a free function (Array API §2.0).
matrix_transpose transposes the last two dimensions and validates
ndim >= 2.
Docs and tests included.
Part of the array API split from ml-explore#3684.
zcbenz
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zcbenz
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Jun 21, 2026
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Summary
This is a focused split from #3684, containing only the ops where the implementation is straightforward.
empty/empty_like— pure aliases viam.attr("empty") = m.attr("zeros")andm.attr("empty_like") = m.attr("zeros_like"), following the pattern established in #3678. MLX does not expose uninitialized memory, so zeros are the correct semantic match per the array API spec.astype— thin free-function wrapper aroundmx::astype, exposing the Array API §2.0astype(x, dtype)signature alongside the existingarray.astypemethod.matrix_transpose— transposes the last two dimensions viamx::swapaxes(a, -2, -1)with anndim >= 2guard.Files changed
python/src/ops.cpp— register all four ops ininit_ops()docs/src/python/ops.rst— add entries in alphabetical orderpython/tests/test_ops.py—test_array_api_creation(empty/empty_like) andtest_astype_and_matrix_transposeRelated
Split from #3684 per reviewer feedback from @zcbenz.