Fix Upsample align_corners singleton output#3769
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Summary
Fix
nn.Upsamplewithalign_corners=Truewhen an output spatial dimension is 1.The aligned-corners scale used
(N - 1) / (M - 1), soM == 1raised aZeroDivisionError. Usingmax(M - 1, 1)keeps existing behavior forM > 1and maps singleton outputs to the first input coordinate.Tests
black --check python/mlx/nn/layers/upsample.py python/tests/test_nn.pypython -m unittest test_nn.TestLayers.test_upsample_align_corners_one_dim -vpython -m unittest test_nn.TestLayers.test_upsample -v