Saleh, Abdelrhman, Natasha Jaques, Asma Ghandeharioun, Judy Shen, and Rosalind Picard. 2020. “Hierarchical Reinforcement Learning for Open-Domain Dialog”. Proceedings of the AAAI Conference on Artificial Intelligence 34 (05):8741-48. https://doi.org/10.1609/aaai.v34i05.6400.