fix: propagate NaN in arg reductions - #4291
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Apply the repository clang-format (v21) to the CUDA arg-reduce changes so pre-commit CI passes on the PR.
zcbenz
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Sorry about that, I checked for prs before setting up a fork CI and didn't check after. Just tested yours and it's solid. Good work! |
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hey @erwinzhang7 thank you! for taking time to check this pr. sorry it ended up being competing pr |
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Proposed changes
Fixes #4274 by making
argminandargmaxselect the firstNaN, matching MLX min/max propagation and NumPy/PyTorch behavior. The implementation covers CPU, Metal, and CUDA reduction paths, including pairwise GPU reductions where separate partials contain NaNs.Checklist
pre-commit run --all-filesto format my code / installed pre-commit prior to committing changes (passed on the formatting commit; see 03694f5)Tests
cmake --build build-metal --target tests -j2./build-metal/tests/tests --test-case='test arg reduce NaN'(12 assertions)./build-metal/tests/tests --test-case='test arg reduce*'(188 assertions)The full Metal suite has pre-existing linalg failures on this host (271 passed, 6 failed); there were no arg-reduce failures. CUDA is not available locally.