pytorch

1accffe4 - Revert D26819810: Revert D26815021: Revert D26744062: Add assert_async

Revert D26819810: Revert D26815021: Revert D26744062: Add assert_async Test Plan: revert-hammer Differential Revision: D26819810 Original commit changeset: e528260e1aa9 fbshipit-source-id: 21567cab5c0ff5f5e60a699d4d4678773a567c30