Analyzing Optimization for Statistical Machine Translation: MERT Learns Verbosity, PRO Learns Length Francisco Guzmán author Preslav Nakov author Stephan Vogel author 2015-07 text Proceedings of the Nineteenth Conference on Computational Natural Language Learning Association for Computational Linguistics Beijing, China conference publication guzman-etal-2015-analyzing 10.18653/v1/K15-1007 https://aclanthology.org/K15-1007/ 2015-07 62 72