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Summary:
If the training stopped in the middle of the last epoch, and then it was resumed from checkpoint, it will not continue the training because `epoch_itr.epoch < max_epoch` is not satisfied. This PR fixed the issue.
Pull Request resolved: https://github.com/pytorch/fairseq/pull/1275

Differential Revision: D18483945

Pulled By: myleott

fbshipit-source-id: 80df6f73fa17606a79a28e8328bb4c577f504683