GLGR: Question-aware Global-to-Local Graph Reasoning for Multi-party Dialogue Reading Comprehension

Yanling Li, Bowei Zou, Yifan Fan, Xibo Li, Ai Ti Aw, Yu Hong

Abstract
Graph reasoning contributes to the integration of discretely-distributed attentive information (clues) for Multi-party Dialogue Reading Comprehension (MDRC). This is attributed primarily to multi-hop reasoning over global conversational structures. However, existing approaches barely apply questions for anti-noise graph reasoning. More seriously, the local semantic structures in utterances are neglected, although they are beneficial for bridging across semantically-related clues. In this paper, we propose a question-aware global-to-local graph reasoning approach. It expands the canonical Interlocutor-Utterance graph by introducing a question node, enabling comprehensive global graph reasoning. More importantly, it constructs a semantic-role graph for each utterance, and accordingly performs local graph reasoning conditioned on the semantic relations. We design a two-stage encoder network to implement the progressive reasoning from the global graph to local. The experiments on the benchmark datasets Molweni and FriendsQA show that our approach yields significant improvements, compared to BERT and ELECTRA baselines. It achieves 73.6% and 77.2% F1-scores on Molweni and FriendsQA, respectively, outperforming state-of-the-art methods that employ different pretrained language models as backbones.
Anthology ID:
2023.findings-emnlp.122
Volume:
Findings of the Association for Computational Linguistics: EMNLP 2023
Month:
December
Year:
2023
Address:
Singapore
Editors:
Houda Bouamor, Juan Pino, Kalika Bali
Venue:
Findings
SIG:
Publisher:
Association for Computational Linguistics
Note:
Pages:
1817–1826
Language:
URL:
https://aclanthology.org/2023.findings-emnlp.122
DOI:
10.18653/v1/2023.findings-emnlp.122
Bibkey:
Cite (ACL):
Yanling Li, Bowei Zou, Yifan Fan, Xibo Li, Ai Ti Aw, and Yu Hong. 2023. GLGR: Question-aware Global-to-Local Graph Reasoning for Multi-party Dialogue Reading Comprehension. In Findings of the Association for Computational Linguistics: EMNLP 2023, pages 1817–1826, Singapore. Association for Computational Linguistics.
Cite (Informal):
GLGR: Question-aware Global-to-Local Graph Reasoning for Multi-party Dialogue Reading Comprehension (Li et al., Findings 2023)
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