Hierarchy Response Learning for Neural Conversation Generation Bo Zhang author Xiaoming Zhang author 2019-11 text Proceedings of the 2019 Conference on Empirical Methods in Natural Language Processing and the 9th International Joint Conference on Natural Language Processing (EMNLP-IJCNLP) Kentaro Inui editor Jing Jiang editor Vincent Ng editor Xiaojun Wan editor Association for Computational Linguistics Hong Kong, China conference publication zhang-zhang-2019-hierarchy 10.18653/v1/D19-1186 https://aclanthology.org/D19-1186/ 2019-11 1772 1781