On-line Dialogue Policy Learning with Companion Teaching Lu Chen author Runzhe Yang author Cheng Chang author Zihao Ye author Xiang Zhou author Kai Yu author 2017-04 text Proceedings of the 15th Conference of the European Chapter of the Association for Computational Linguistics: Volume 2, Short Papers Mirella Lapata editor Phil Blunsom editor Alexander Koller editor Association for Computational Linguistics Valencia, Spain conference publication chen-etal-2017-line https://aclanthology.org/E17-2032/ 2017-04 198 204