task 3: typecheck (#60805)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/60805
Test Plan: Imported from OSS
Reviewed By: jamesr66a, VitalyFedyunin
Differential Revision: D29522885
Pulled By: migeed-z
fbshipit-source-id: 559a8a495a16e517af77fd5a0785a82e1ebb3bd7
