Topic-Aware Evidence Reasoning and Stance-Aware Aggregation for Fact Verification

Jiasheng Si, Deyu Zhou, Tongzhe Li, Xingyu Shi, Yulan He


Abstract
Fact verification is a challenging task that requires simultaneously reasoning and aggregating over multiple retrieved pieces of evidence to evaluate the truthfulness of a claim. Existing approaches typically (i) explore the semantic interaction between the claim and evidence at different granularity levels but fail to capture their topical consistency during the reasoning process, which we believe is crucial for verification; (ii) aggregate multiple pieces of evidence equally without considering their implicit stances to the claim, thereby introducing spurious information. To alleviate the above issues, we propose a novel topic-aware evidence reasoning and stance-aware aggregation model for more accurate fact verification, with the following four key properties: 1) checking topical consistency between the claim and evidence; 2) maintaining topical coherence among multiple pieces of evidence; 3) ensuring semantic similarity between the global topic information and the semantic representation of evidence; 4) aggregating evidence based on their implicit stances to the claim. Extensive experiments conducted on the two benchmark datasets demonstrate the superiority of the proposed model over several state-of-the-art approaches for fact verification. The source code can be obtained from https://github.com/jasenchn/TARSA.
Anthology ID:
2021.acl-long.128
Volume:
Proceedings of the 59th Annual Meeting of the Association for Computational Linguistics and the 11th International Joint Conference on Natural Language Processing (Volume 1: Long Papers)
Month:
August
Year:
2021
Address:
Online
Venues:
ACL | IJCNLP
SIG:
Publisher:
Association for Computational Linguistics
Note:
Pages:
1612–1622
Language:
URL:
https://aclanthology.org/2021.acl-long.128
DOI:
10.18653/v1/2021.acl-long.128
Bibkey:
Cite (ACL):
Jiasheng Si, Deyu Zhou, Tongzhe Li, Xingyu Shi, and Yulan He. 2021. Topic-Aware Evidence Reasoning and Stance-Aware Aggregation for Fact Verification. In Proceedings of the 59th Annual Meeting of the Association for Computational Linguistics and the 11th International Joint Conference on Natural Language Processing (Volume 1: Long Papers), pages 1612–1622, Online. Association for Computational Linguistics.
Cite (Informal):
Topic-Aware Evidence Reasoning and Stance-Aware Aggregation for Fact Verification (Si et al., ACL 2021)
Copy Citation:
PDF:
https://aclanthology.org/2021.acl-long.128.pdf
Code
 jasenchn/TARSA
Data
FEVER