Error4 reports
Fix AssertionError
in PyTorch
✅ Solution
AssertionError in PyTorch Inductor often arises from stride mismatches during tensor layout optimization, particularly in convolutional operations. This happens when the predicted strides of a tensor after a series of operations don't align with the actual strides. To fix it, carefully inspect the stride calculations within Inductor's layout propagation rules, ensuring they accurately reflect the effects of operations like convolution, transpose, and reshaping; manually override the predicted layout if necessary using `Layout.set_stride` or disabling targeted layout optimizations with `torch._dynamo.config.force_layout_optimization = False`.
Related Issues
Real GitHub issues where developers encountered this error:
[inductor] `torch.compile` crashes on convolutions when weight is a plain tensor — stride prediction mismatchMay 16, 2026
[inductor] `torch.compile` crashes on `conv_transpose2d` with `output_padding` — stride prediction mismatchMay 16, 2026
[inductor] `force_layout_optimization=True` crashes on `conv2d + avg_pool2d + flatten` — stride mismatchMay 16, 2026
[inductor] `torch.compile` crashes on `conv2d` with cuDNN disabled — stride prediction mismatchMay 16, 2026
Timeline
First reported:May 16, 2026
Last reported:May 16, 2026