benchmark

e6251f18 - Enable flash_v3 backward (#2445)

Enable flash_v3 backward (#2445) Summary: Pull Request resolved: https://github.com/pytorch/benchmark/pull/2445 Reviewed By: xuzhao9 Differential Revision: D61924864 Pulled By: bertmaher fbshipit-source-id: 760036820c1196a921eaff4d99bf8647e25264ee