array API: add positive, logical_xor, trunc, count_nonzero, diff, full_like#3730
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array API: add positive, logical_xor, trunc, count_nonzero, diff, full_like#3730katlun-lgtm wants to merge 2 commits into
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ops that are not pure aliases should have C++ versions and then exposed in python
…f, full_like New elementwise and utility ops required by the Python array API standard (https://data-apis.org/array-api/latest/): - positive: unary plus, returns a copy (mx::astype to same dtype) - logical_xor: element-wise XOR via not_equal(bool(a), bool(b)) - trunc: truncate toward zero (where(a < 0, ceil, floor)) - count_nonzero: count non-zero elements; returns int32; supports axis/keepdims - diff: n-th discrete difference along an axis, with optional prepend/append - full_like: fill an array shaped like the input; optional dtype override Docs and tests included. Part of the array API split from ml-explore#3684.
Per zcbenz review: ops that are not pure aliases must have C++ implementations exposed through the usual mlx/ops.h + mlx/ops.cpp path, not inline Python-binding lambdas. - positive: array copy (like __copy__) - logical_xor: not_equal(astype(a,bool_), astype(b,bool_)) - trunc: where(less(a,0), ceil, floor); integers returned as-is - count_nonzero: sum(not_equal(a,0).astype(int32)) with axis overloads - diff: n-th slice subtraction with optional prepend/append - full_like: delegates to existing mx::full_like C++ overload Python bindings in python/src/ops.cpp now call the C++ functions instead of duplicating the logic inline.
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Summary
Focused split from #3684. Adds six new ops required by the Python array API standard that have substantive implementations (not pure aliases).
positivemx::astype(a, a.dtype())— copy with same dtype (shallow copy semantics per @zcbenz's comment on #3684)logical_xornot_equal(bool(a), bool(b))truncwhere(a < 0, ceil(a), floor(a))— truncate toward zerocount_nonzerosum(not_equal(a, 0).astype(int32))with axis/keepdims supportdiffslicesubtraction; supportsprepend/appendfull_likemx::full(a.shape(), vals)with optional dtype overrideFiles changed
python/src/ops.cpp— C++ lambda registrations ininit_ops()docs/src/python/ops.rst— alphabetical entriespython/tests/test_ops.py—test_array_api_elementwise,test_diff,test_array_api_creation(full_like part)Related
Split from #3684 per reviewer feedback from @zcbenz.