Remove overridden inverse_sqrt lr scheduler in dynamic conv example (#769)
Remove overridden inverse_sqrt lr scheduler in dynamic conv example (#769)

Summary:
Resolves #768
Pull Request resolved: https://github.com/pytorch/fairseq/pull/769

Differential Revision: D15621841

Pulled By: lematt1991

fbshipit-source-id: 694effe3788ff7d04864217d673608ec31da589e

pytorch/fairseq,pytorch/fairseq,pytorch/fairseq