pytorch

b5a38fa9 - update op bench readme (#29596)

update op bench readme (#29596) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/29596 as title Test Plan: na Reviewed By: hl475 Differential Revision: D18437811 fbshipit-source-id: 7996d1689d8a46849b62b2b3875c67cf8dc5861c