The NiuTrans Machine Translation Systems for WMT19 Bei Li author Yinqiao Li author Chen Xu author Ye Lin author Jiqiang Liu author Hui Liu author Ziyang Wang author Yuhao Zhang author Nuo Xu author Zeyang Wang author Kai Feng author Hexuan Chen author Tengbo Liu author Yanyang Li author Qiang Wang author Tong Xiao author Jingbo Zhu author 2019-08 text Proceedings of the Fourth Conference on Machine Translation (Volume 2: Shared Task Papers, Day 1) Ondřej Bojar editor Rajen Chatterjee editor Christian Federmann editor Mark Fishel editor Yvette Graham editor Barry Haddow editor Matthias Huck editor Antonio Jimeno Yepes editor Philipp Koehn editor André Martins editor Christof Monz editor Matteo Negri editor Aurélie Névéol editor Mariana Neves editor Matt Post editor Marco Turchi editor Karin Verspoor editor Association for Computational Linguistics Florence, Italy conference publication li-etal-2019-niutrans 10.18653/v1/W19-5325 https://aclanthology.org/W19-5325/ 2019-08 257 266