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Align mlx::core::max op nan propagation with NumPy (#2339)

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* Make max op NaN propagation rules align with numpy

* Adding benchmarks and testing for max op nanpropagation

* Pre-commit formatting

* Fix max complex64 nan propagation and add test

* Improve the cpp unittest

* Only check nans on non-integral types in simd_reduce_impl.

* Cleanup using namespace alias

* Add cpu Max nanpropagation. Fix a small fib in cpu max dispatch data types for int8/int16.

* Make the max nanpropagation test more meaningful for integer types

* Remove tuple unpacking syntax to comply with earlier python versions. Add cuda skip to nanpropagation tests, fix cuda implementation in a separate PR.
This commit is contained in:
jhavukainen
2025-07-09 11:26:27 -07:00
committed by GitHub
parent fb4e8b896b
commit 8b9a3f3cea
7 changed files with 131 additions and 5 deletions
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57
python/tests/test_reduce.py
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@@ -153,6 +153,63 @@ class TestReduce(mlx_tests.MLXTestCase):
x = x.transpose(1, 0, 2, 3, 4, 5, 6, 7, 8, 9)
check(x, (1, 3, 5, 7, 9))
def test_nanpropagation(self):
dtypes = [
"uint8",
"uint16",
"uint32",
"int8",
"int16",
"int32",
"float16",
"float32",
]
for dtype in dtypes:
with self.subTest(dtype=dtype):
x = (mx.random.normal((4, 4)) * 10).astype(getattr(mx, dtype))
indices = mx.random.randint(0, 4, shape=(6,)).reshape(3, 2)
for idx in indices:
x[idx[0], idx[1]] = mx.nan
x_np = np.array(x)
for op in ["max"]:
for axis in [0, 1]:
out = getattr(mx, op)(x, axis=axis)
ref = getattr(np, op)(x_np, axis=axis)
self.assertTrue(np.array_equal(out, ref, equal_nan=True))
def test_nanpropagation_complex64(self):
complex_array_1 = mx.array(
[1 + 1j, 2 + 2j, 3 + 3j, mx.nan + 4j], dtype=mx.complex64
).reshape(2, 2)
complex_array_2 = mx.array(
[1 + 1j, 2 + 2j, 3 + mx.nan * 1j, 4 + 4j], dtype=mx.complex64
).reshape(2, 2)
complex_array_3 = mx.array(
[1 + 1j, 2 + mx.nan * 1j, 3 + 3j, 4 + 4j], dtype=mx.complex64
).reshape(2, 2)
complex_array_4 = mx.array(
[mx.nan + 1j, 2 + 2j, 3 + 3j, 4 + 4j], dtype=mx.complex64
).reshape(2, 2)
np_arrays = [
np.array(complex_array_1),
np.array(complex_array_2),
np.array(complex_array_3),
np.array(complex_array_4),
]
for mx_arr, np_arr in zip(
[complex_array_1, complex_array_2, complex_array_3, complex_array_4],
np_arrays,
):
for axis in [0, 1]:
for op in ["max"]:
out = getattr(mx, op)(mx_arr, axis=axis)
ref = getattr(np, op)(np_arr, axis=axis)
self.assertTrue(np.array_equal(out, ref, equal_nan=True))
if __name__ == "__main__":
mlx_tests.MLXTestRunner(failfast=True)