arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2305.09359cs.CL
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从新闻中构建和解释因果知识图谱

Constructing and Interpreting Causal Knowledge Graphs from News

Institute of Data Science, National University of Singapore(新加坡国立大学数据科学学院);Panasonic Industrial Devices Singapore(松下工业器件(新加坡))

Fiona Anting Tan, Debdeep Paul, Sahim Yamaura, Miura Koji, See-Kiong Ng

AI总结:

本文提出一种结合基于BERT的模型与模式匹配从新闻中提取因果关系,并利用主题建模进行论元聚类以构建高连通性因果知识图谱的方法,有效提升了召回率、精确率与可解释性。

摘要:

许多金融工作依赖新闻来了解过去和现在的因果事件,从而对未来做出明智的决策和预测。随着在线可用新闻数量的不断增加,需要自动化从非结构化文本中提取因果事件。在本研究中,我们提出了一种使用两个步骤从新闻中构建因果知识图谱(KGs)的方法:(1)因果关系的提取,以及(2)论元聚类及其在知识图谱中的表示。我们旨在构建强调召回率、精确率和可解释性的图。对于提取,尽管许多早期工作已经从文本构建因果知识图谱,但大多数采用基础的模式匹配方法。我们通过将最新的基于BERT的提取模型与基于模式的方法结合使用来弥补这一差距。结果,我们在保持高精确率的同时实现了高召回率。对于聚类,我们利用主题建模方法对论元进行聚类,以增加图的连通性。结果,我们获得了1个连通图,而不是15,686个不连通的子图,使用户能够从中推断出更多的因果关系。我们最终的知识图谱有效地捕获和传达了因果关系,并通过实验、多个用例和用户反馈得到了验证。

英文摘要:

Many financial jobs rely on news to learn about causal events in the past and present, to make informed decisions and predictions about the future. With the ever-increasing amount of news available online, there is a need to automate the extraction of causal events from unstructured texts. In this work, we propose a methodology to construct causal knowledge graphs (KGs) from news using two steps: (1) Extraction of Causal Relations, and (2) Argument Clustering and Representation into KG. We aim to build graphs that emphasize on recall, precision and interpretability. For extraction, although many earlier works already construct causal KGs from text, most adopt rudimentary pattern-based methods. We close this gap by using the latest BERT-based extraction models alongside pattern-based ones. As a result, we achieved a high recall, while still maintaining a high precision. For clustering, we utilized a topic modelling approach to cluster our arguments, so as to increase the connectivity of our graph. As a result, instead of 15,686 disconnected subgraphs, we were able to obtain 1 connected graph that enables users to infer more causal relationships from. Our final KG effectively captures and conveys causal relationships, validated through experiments, multiple use cases and user feedback.

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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