pytorch

68b4d22d - Uninitialize the accumulation buffer to save some overhead (#27005)

Uninitialize the accumulation buffer to save some overhead (#27005) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/27005 Similar to https://github.com/pytorch/pytorch/pull/27002, we want to save some overhead. ghstack-source-id: 91046563 Test Plan: CI Differential Revision: D17641819 fbshipit-source-id: 9320919242a48f48532035e61d9844de671d39af