pytorch

689a5edd - Revert D28326365: [pytorch][PR] Add `torch.cuda.streams.ExternalStream`

Revert D28326365: [pytorch][PR] Add `torch.cuda.streams.ExternalStream` Test Plan: revert-hammer Differential Revision: D28326365 (https://github.com/pytorch/pytorch/commit/d7ef9b73fbc971c241bc3a10be4dc368d5786507) Original commit changeset: b67858c80339 fbshipit-source-id: 337588d40b96cf04e46e554fa481ae7fd4254478