Knowledge-Enhanced Graph Attention Network for Fact Verification

Mathematics

Chonghao Chen¹  Jianming Zheng¹  Honghui Chen¹ 

[1] Science and Technology on Information Systems Engineering Laboratory, National University of Defense Technology, Changsha 410073, China;

关键词: fact verification;    external knowledge;    graph attention network;    contrastive learning;   

DOI  :  10.3390/math9161949

来源: DOAJ

【 摘 要 】

Fact verification aims to evaluate the authenticity of a given claim based on the evidence sentences retrieved from Wikipedia articles. Existing works mainly leverage the natural language inference methods to model the semantic interaction of claim and evidence, or further employ the graph structure to capture the relation features between multiple evidences. However, previous methods have limited representation ability in encoding complicated units of claim and evidences, and thus cannot support sophisticated reasoning. In addition, a limited amount of supervisory signals lead to the graph encoder could not distinguish the distinctions of different graph structures and weaken the encoding ability. To address the above issues, we propose a Knowledge-Enhanced Graph Attention network (KEGA) for fact verification, which introduces a knowledge integration module to enhance the representation of claims and evidences by incorporating external knowledge. Moreover, KEGA leverages an auxiliary loss based on contrastive learning to fine-tune the graph attention encoder and learn the discriminative features for the evidence graph. Comprehensive experiments conducted on FEVER, a large-scale benchmark dataset for fact verification, demonstrate the superiority of our proposal in both the multi-evidences and single-evidence scenarios. In addition, our findings show that the background knowledge for words can effectively improve the model performance.

【 授权许可】

Unknown