Port sign to structured (#57588)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/57588
Test Plan: Imported from OSS
Reviewed By: VitalyFedyunin
Differential Revision: D28224600
Pulled By: ezyang
fbshipit-source-id: 71de5211617c1eba34192e23831136ae5c403e61
