Conversational Response Re-ranking Based on Event Causality and Role Factored Tensor Event Embedding

Shohei Tanaka, Koichiro Yoshino, Katsuhito Sudoh, Satoshi Nakamura


Abstract
We propose a novel method for selecting coherent and diverse responses for a given dialogue context. The proposed method re-ranks response candidates generated from conversational models by using event causality relations between events in a dialogue history and response candidates (e.g., “be stressed out” precedes “relieve stress”). We use distributed event representation based on the Role Factored Tensor Model for a robust matching of event causality relations due to limited event causality knowledge of the system. Experimental results showed that the proposed method improved coherency and dialogue continuity of system responses.
Anthology ID:
W19-4106
Volume:
Proceedings of the First Workshop on NLP for Conversational AI
Month:
August
Year:
2019
Address:
Florence, Italy
Editors:
Yun-Nung Chen, Tania Bedrax-Weiss, Dilek Hakkani-Tur, Anuj Kumar, Mike Lewis, Thang-Minh Luong, Pei-Hao Su, Tsung-Hsien Wen
Venue:
ACL
SIG:
Publisher:
Association for Computational Linguistics
Note:
Pages:
51–59
Language:
URL:
https://aclanthology.org/W19-4106
DOI:
10.18653/v1/W19-4106
Bibkey:
Cite (ACL):
Shohei Tanaka, Koichiro Yoshino, Katsuhito Sudoh, and Satoshi Nakamura. 2019. Conversational Response Re-ranking Based on Event Causality and Role Factored Tensor Event Embedding. In Proceedings of the First Workshop on NLP for Conversational AI, pages 51–59, Florence, Italy. Association for Computational Linguistics.
Cite (Informal):
Conversational Response Re-ranking Based on Event Causality and Role Factored Tensor Event Embedding (Tanaka et al., ACL 2019)
Copy Citation:
PDF:
https://aclanthology.org/W19-4106.pdf
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