Mandy Guo author Yinfei Yang author Keith Stevens author Daniel Cer author Heming Ge author Yun-hsuan Sung author Brian Strope author Ray Kurzweil author 2019-08 text 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 guo-etal-2019-hierarchical 10.18653/v1/W19-5207 https://aclanthology.org/W19-5207/ 2019-08 64 72