pytorch

10d64a13 - add tanh to AD and fix layernorm schema

add tanh to AD and fix layernorm schema Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/17816 Differential Revision: D14453048 Pulled By: wanchaol fbshipit-source-id: 45815db964a4d9ee85d8933e335b47f215e3c467