Tuning SMT with a Large Number of Features via Online Feature Grouping Lemao Liu author Tiejun Zhao author Taro Watanabe author Eiichiro Sumita author 2013-10 text Proceedings of the Sixth International Joint Conference on Natural Language Processing Ruslan Mitkov editor Jong C Park editor Asian Federation of Natural Language Processing Nagoya, Japan conference publication liu-etal-2013-tuning https://aclanthology.org/I13-1032/ 2013-10 279 285