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Document sort stability and NaN handling - #3400
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Both `sort` and `argsort` are stable across all backends (std::stable_sort on CPU, merge sort on Metal/CUDA) and place NaN values at the end to match NumPy/JAX. Add this to the Python docstrings and C++ declarations so users can rely on these guarantees.
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Summary
Addresses #2057.
Documents that
sortandargsortare stable across all backends and place NaN values at the end to match NumPy/JAX.std::stable_sortwith a NaN-aware comparator (mlx/backend/cpu/sort.cpp)mlx/backend/metal/kernels/sort.h,mlx/backend/cuda/sort.cu)Both guarantees are true in the current implementation (NaN handling introduced in #2667) but weren't documented, so users couldn't rely on them.
Changes
python/src/ops.cpp— add note tosortandargsortdocstringsmlx/ops.h— add note to the four C++ declarationsmlx/ops.cpp— add note to the four C++ definitionsTest plan
pre-commit run --all-filespassesctestpassespython -m pytest python/tests/test_ops.py -k sortpasseshelp(mx.sort)renders the new docstring at runtime