Add anneal-eps argument
Add anneal-eps argument

Summary: Used in fairspeq/train.py

Reviewed By: myleott, yqwangustc

Differential Revision: D14841512

fbshipit-source-id: 02fd7b58841c32e2797e3159e65f2bef36f02da1

pytorch/fairseq,pytorch/fairseq,pytorch/fairseq