Back-Translation Sampling by Targeting Difficult Words in Neural Machine Translation Marzieh Fadaee author Christof Monz author 2018-oct-nov text Proceedings of the 2018 Conference on Empirical Methods in Natural Language Processing Ellen Riloff editor David Chiang editor Julia Hockenmaier editor Jun’ichi Tsujii editor Association for Computational Linguistics Brussels, Belgium conference publication fadaee-monz-2018-back 10.18653/v1/D18-1040 https://aclanthology.org/D18-1040/ 2018-oct-nov 436 446