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PyTorch: Handle symbolic mask sizes in scalar setitem fast path (#200412)

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Key Architectural Takeaway

Linked issue or supporting maintainer Fixes #200396 reported by @ydshieh Supported by @atalman @ngimel BC-breaking? No Summary This is a followup to #188330 which fixes the fast path for unbacked symbolic dimensions.

Executive Summary

Linked issue or supporting maintainer Fixes #200396 reported by @ydshieh Supported by @atalman @ngimel BC-breaking? No Summary This is a followup to #188330 which fixes the fast path for unbacked symbolic dimensions. As suggested by @ahlag in #200396 (comment) . Pull Request resolved: #200412 Approved by: https://github.com/Skylion007 , https://github.com/atalman , https://github.com/laithsakka

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