FlowEval: A Consensus-Based Dialogue Evaluation Framework Using Segment Act Flows

Jianqiao Zhao, Yanyang Li, Wanyu Du, Yangfeng Ji, Dong Yu, Michael Lyu, Liwei Wang


Abstract
Despite recent progress in open-domain dialogue evaluation, how to develop automatic metrics remains an open problem. We explore the potential of dialogue evaluation featuring dialog act information, which was hardly explicitly modeled in previous methods. However, defined at the utterance level in general, dialog act is of coarse granularity, as an utterance can contain multiple segments possessing different functions. Hence, we propose segment act, an extension of dialog act from utterance level to segment level, and crowdsource a large-scale dataset for it. To utilize segment act flows, sequences of segment acts, for evaluation, we develop the first consensus-based dialogue evaluation framework, FlowEval. This framework provides a reference-free approach for dialog evaluation by finding pseudo-references. Extensive experiments against strong baselines on three benchmark datasets demonstrate the effectiveness and other desirable characteristics of our FlowEval, pointing out a potential path for better dialogue evaluation.
Anthology ID:
2022.emnlp-main.715
Volume:
Proceedings of the 2022 Conference on Empirical Methods in Natural Language Processing
Month:
December
Year:
2022
Address:
Abu Dhabi, United Arab Emirates
Editors:
Yoav Goldberg, Zornitsa Kozareva, Yue Zhang
Venue:
EMNLP
SIG:
Publisher:
Association for Computational Linguistics
Note:
Pages:
10469–10483
Language:
URL:
https://aclanthology.org/2022.emnlp-main.715
DOI:
10.18653/v1/2022.emnlp-main.715
Bibkey:
Cite (ACL):
Jianqiao Zhao, Yanyang Li, Wanyu Du, Yangfeng Ji, Dong Yu, Michael Lyu, and Liwei Wang. 2022. FlowEval: A Consensus-Based Dialogue Evaluation Framework Using Segment Act Flows. In Proceedings of the 2022 Conference on Empirical Methods in Natural Language Processing, pages 10469–10483, Abu Dhabi, United Arab Emirates. Association for Computational Linguistics.
Cite (Informal):
FlowEval: A Consensus-Based Dialogue Evaluation Framework Using Segment Act Flows (Zhao et al., EMNLP 2022)
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PDF:
https://aclanthology.org/2022.emnlp-main.715.pdf