pytorch

abe05a16 - Revert D18195868: Implementation of cosine learning rate training policy

Revert D18195868: Implementation of cosine learning rate training policy Test Plan: revert-hammer Differential Revision: D18195868 Original commit changeset: 67bdb0b8dd31 fbshipit-source-id: f26761c82788f4c06f624fbd968fb966db8ecb47