pytorch

341fb6d1 - Make caffe2/caffe2/python/models/seq2seq python3 compatible

Make caffe2/caffe2/python/models/seq2seq python3 compatible Test Plan: watiforsadcastle Reviewed By: dzhulgakov Differential Revision: D19698403 fbshipit-source-id: 36b73e07e598c848abbe368e522484da9ba4c78f