fix transpose / permutations fusion pass#10780
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facebook-github-bot merged 1 commit intopytorch:mainfrom May 9, 2025
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fix transpose / permutations fusion pass#10780facebook-github-bot merged 1 commit intopytorch:mainfrom
facebook-github-bot merged 1 commit intopytorch:mainfrom
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Summary: Follow up on D73619452 We noticed that this pattern used to be fused, but stopped being fused after D73619452. What happens is that we were checking for unitary dimensions. So a tensor of shape [1, 5, 30] is equivalent (in memory) to [5, 1, 30]. So, transposing on [0, 2] then on [0, 1] is (almost) equivalent to an identity and can be fused This diff re-establishes this behavior. Reviewed By: mcremon-meta Differential Revision: D74447383
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Summary:
Follow up on D73619452
We noticed that this pattern used to be fused, but stopped being fused after D73619452.
What happens is that we were checking for unitary dimensions. So a tensor of shape [1, 5, 30] is equivalent (in memory) to [5, 1, 30]. So, transposing on [0, 2] then on [0, 1] is (almost) equivalent to an identity and can be fused
This diff re-establishes this behavior.
Differential Revision: D74447383