Gunrock: A Social Bot for Complex and Engaging Long Conversations
Dian Yu | Michelle Cohn | Yi Mang Yang | Chun Yen Chen | Weiming Wen | Jiaping Zhang | Mingyang Zhou | Kevin Jesse | Austin Chau | Antara Bhowmick | Shreenath Iyer | Giritheja Sreenivasulu | Sam Davidson | Ashwin Bhandare | Zhou Yu
Proceedings of the 2019 Conference on Empirical Methods in Natural Language Processing and the 9th International Joint Conference on Natural Language Processing (EMNLP-IJCNLP): System Demonstrations
Gunrock is the winner of the 2018 Amazon Alexa Prize, as evaluated by coherence and engagement from both real users and Amazon-selected expert conversationalists. We focus on understanding complex sentences and having in-depth conversations in open domains. In this paper, we introduce some innovative system designs and related validation analysis. Overall, we found that users produce longer sentences to Gunrock, which are directly related to users’ engagement (e.g., ratings, number of turns). Additionally, users’ backstory queries about Gunrock are positively correlated to user satisfaction. Finally, we found dialog flows that interleave facts and personal opinions and stories lead to better user satisfaction.
Multimodal Hierarchical Reinforcement Learning Policy for Task-Oriented Visual Dialog
Jiaping Zhang | Tiancheng Zhao | Zhou Yu
Proceedings of the 19th Annual SIGdial Meeting on Discourse and Dialogue
Creating an intelligent conversational system that understands vision and language is one of the ultimate goals in Artificial Intelligence (AI) (Winograd, 1972). Extensive research has focused on vision-to-language generation, however, limited research has touched on combining these two modalities in a goal-driven dialog context. We propose a multimodal hierarchical reinforcement learning framework that dynamically integrates vision and language for task-oriented visual dialog. The framework jointly learns the multimodal dialog state representation and the hierarchical dialog policy to improve both dialog task success and efficiency. We also propose a new technique, state adaptation, to integrate context awareness in the dialog state representation. We evaluate the proposed framework and the state adaptation technique in an image guessing game and achieve promising results.
- Zhou Yu 2
- Tiancheng Zhao 1
- Dian Yu 1
- Michelle Cohn 1
- Yi Mang Yang 1
- show all...