Subgoal Discovery for Hierarchical Dialogue Policy Learning Da Tang author Xiujun Li author Jianfeng Gao author Chong Wang author Lihong Li author Tony Jebara author 2018-oct-nov text Proceedings of the 2018 Conference on Empirical Methods in Natural Language Processing Ellen Riloff editor David Chiang editor Julia Hockenmaier editor Jun’ichi Tsujii editor Association for Computational Linguistics Brussels, Belgium conference publication tang-etal-2018-subgoal 10.18653/v1/D18-1253 https://aclanthology.org/D18-1253/ 2018-oct-nov 2298 2309