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arXiv 2009.06402cs.CLcs.LGstat.ML
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用于事实核查的时间感知证据排序

Time-Aware Evidence Ranking for Fact-Checking

European Commission, Joint Research Centre (JRC)(欧洲委员会联合研究中心);KU Leuven(鲁汶大学);University of Copenhagen(哥本哈根大学)

Liesbeth Allein, Isabelle Augenstein, Marie-Francine Moens

摘要:

真理可以随着时间而变化。因此,关于索赔真实性的事实核查决定应考虑到索赔和支持或反驳证据的时间信息。在这项工作中,我们调查的假设,一个网页的时间戳是至关重要的,它应该如何排名一个给定的索赔。我们描绘了四个时间排序方法,限制证据的排名不同,并模拟假设特定的证据排名的证据时间戳作为金标准。三个事实检查模型中的证据排序最终使用学习排序损失函数进行优化。我们的研究表明,时间感知的证据排名不仅超越了纯粹基于语义相似性或在搜索结果列表中的位置的相关性假设,而且还提高了对时间敏感的索赔的准确性预测。

英文摘要:

Truth can vary over time. Fact-checking decisions on claim veracity should therefore take into account temporal information of both the claim and supporting or refuting evidence. In this work, we investigate the hypothesis that the timestamp of a Web page is crucial to how it should be ranked for a given claim. We delineate four temporal ranking methods that constrain evidence ranking differently and simulate hypothesis-specific evidence rankings given the evidence timestamps as gold standard. Evidence ranking in three fact-checking models is ultimately optimized using a learning-to-rank loss function. Our study reveals that time-aware evidence ranking not only surpasses relevance assumptions based purely on semantic similarity or position in a search results list, but also improves veracity predictions of time-sensitive claims in particular.

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