pytorch

bb8983e9 - Revert D17694691: Enable distributed autograd tests for >py36

Revert D17694691: Enable distributed autograd tests for >py36 Test Plan: revert-hammer Differential Revision: D17694691 Original commit changeset: 6e7b74064589 fbshipit-source-id: 7da10f478adbbde05f16eb6095acb000d7945c99