GitLab

Summary:
Pull Request resolved: https://github.com/pytorch/fairseq/pull/747

In https://github.com/pytorch/fairseq/pull/647, checkpoint averaging
is not Implemented correctly when it comes to shared parameters. This diff
has the right Implementation and a test case to guard future change.

Reviewed By: myleott

Differential Revision: D15402943

fbshipit-source-id: 8004836d5c2571814ea54844650618008a9ee522