Fix bug in optimized mul's broadcast handling #11590
Merged
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Summary:
When we have two tensors that match exactly in size but not in dims, the output resize does not work correctly in cases like this a[6] b[1, 1, 6] -> out [1, 1, 6] but current code tried to resize using a.sizes()
Test Plan:
tests added
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Summary
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Test plan
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