Hierarchical Dialogue Policy Learning using Flexible State Transitions and Linear Function Approximation Heriberto Cuayáhuitl author Ivana Kruijff-Korbayová author Nina Dethlefs author 2012-12 text Proceedings of COLING 2012: Demonstration Papers Martin Kay editor Christian Boitet editor The COLING 2012 Organizing Committee Mumbai, India conference publication cuayahuitl-etal-2012-hierarchical https://aclanthology.org/C12-3012/ 2012-12 95 102