pytorch

44b12ba8 - [Pytorch Profiler] Move start timestamp to end of start callback (#62191)

[Pytorch Profiler] Move start timestamp to end of start callback (#62191) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/62191 This moves start timestamping to end of callback. This way we dont account for callstack/module hierarchy related overhead in op runtime. Test Plan: CI Imported from OSS Reviewed By: ilia-cher Differential Revision: D29910519 fbshipit-source-id: f462031a81ae12b3db7993cf482e5ad93a35e096