Hierarchical Reinforcement Learning and Hidden Markov Models for Task-Oriented Natural Language Generation Nina Dethlefs author Heriberto CuayƔhuitl author 2011-06 text Proceedings of the 49th Annual Meeting of the Association for Computational Linguistics: Human Language Technologies Dekang Lin editor Yuji Matsumoto editor Rada Mihalcea editor Association for Computational Linguistics Portland, Oregon, USA conference publication dethlefs-cuayahuitl-2011-hierarchical https://aclanthology.org/P11-2115/ 2011-06 654 659