Simple distributed optimizer (#29304)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/29304
Implements a simple python distributed optimizer that takes rrefs to parameters that will be optimized.
It keeps instances of optimizers remotely and calling step on distributed optimizer will call step on each of the remote optimizers in parallel.
ghstack-source-id: 93564364
Test Plan: unit tests.
Differential Revision: D18354586
fbshipit-source-id: 85d4c8bfec4aa38d2863cda704d024692511cff5
