Improving Neural Machine Translation Robustness via Data Augmentation: Beyond Back-Translation Zhenhao Li author Lucia Specia author 2019-11 text Proceedings of the 5th Workshop on Noisy User-generated Text (W-NUT 2019) Wei Xu editor Alan Ritter editor Tim Baldwin editor Afshin Rahimi editor Association for Computational Linguistics Hong Kong, China conference publication li-specia-2019-improving 10.18653/v1/D19-5543 https://aclanthology.org/D19-5543/ 2019-11 328 336