Hierarchical Reinforcement Learning for Adaptive Text Generation Nina Dethlefs author Heriberto Cuayáhuitl author 2010-07 text Proceedings of the 6th International Natural Language Generation Conference John Kelleher editor Brian Mac Namee editor Ielka van der Sluis editor Association for Computational Linguistics conference publication dethlefs-cuayahuitl-2010-hierarchical https://aclanthology.org/W10-4204/ 2010-07