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arXiv 2201.06885cs.CLcs.AI
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基于证据意识的图神经网络虚假新闻检测

Evidence-aware Fake News Detection with Graph Neural Networks

Institute of Automation, Chinese Academy of Sciences(中国科学院自动化研究所);University of Chinese Academy of Sciences(中国科学院大学);Beijing Institute of Technology(北京理工大学)

Weizhi Xu, Junfei Wu, Qiang Liu, Shu Wu, Liang Wang

摘要:

虚假新闻的泛滥和危害性已经成为互联网上的一个重要问题,这反过来又刺激了虚假新闻自动检测的发展。在本文中,我们专注于基于证据的假新闻检测,其中利用多种证据来探测新闻的真实性(即,索赔)。大多数先前的方法首先采用顺序模型来嵌入语义信息,然后基于不同的注意力机制来捕获声明-证据交互。尽管它们有效,但仍然存在两个主要弱点。首先,由于序列模型固有的缺陷,它们无法整合证据中分散的相关信息进行准确性检查。第二,忽视了证据中包含的大量冗余信息,而这些冗余信息可能是无用的,甚至是有害的。针对这些问题,本文提出了一个统一的基于图的语义结构挖掘框架,简称GET。具体来说,不同于现有的工作,把索赔和证据序列,我们把它们建模为图结构的数据,并捕捉分散的相关片段通过邻域传播之间的长距离语义依赖。在获得上下文语义信息后,我们的模型通过执行图结构学习来减少信息冗余。最后,细粒度的语义表示被馈送到下游的索赔-证据交互模块进行预测。综合实验证明了GET算法的优越性。

英文摘要:

The prevalence and perniciousness of fake news has been a critical issue on the Internet, which stimulates the development of automatic fake news detection in turn. In this paper, we focus on the evidence-based fake news detection, where several evidences are utilized to probe the veracity of news (i.e., a claim). Most previous methods first employ sequential models to embed the semantic information and then capture the claim-evidence interaction based on different attention mechanisms. Despite their effectiveness, they still suffer from two main weaknesses. Firstly, due to the inherent drawbacks of sequential models, they fail to integrate the relevant information that is scattered far apart in evidences for veracity checking. Secondly, they neglect much redundant information contained in evidences that may be useless or even harmful. To solve these problems, we propose a unified Graph-based sEmantic sTructure mining framework, namely GET in short. Specifically, different from the existing work that treats claims and evidences as sequences, we model them as graph-structured data and capture the long-distance semantic dependency among dispersed relevant snippets via neighborhood propagation. After obtaining contextual semantic information, our model reduces information redundancy by performing graph structure learning. Finally, the fine-grained semantic representations are fed into the downstream claim-evidence interaction module for predictions. Comprehensive experiments have demonstrated the superiority of GET over the state-of-the-arts.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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