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arXiv 2006.12418cs.CL
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迈向可解释作者身份验证的一步

A Step Towards Interpretable Authorship Verification

Fraunhofer Institute for Secure Information Technology SIT(弗劳恩霍夫安全信息技术研究所)

Oren Halvani, Lukas Graner, Roey Regev

摘要:

在数字文本取证领域研究多年的一个中心问题是两个文档是否由同一作者撰写的问题。作者身份验证(authorship verification,AV)是该领域的一个研究分支,主要解决这一问题.多年来,AV背景下的研究活动稳步增加,这导致了试图解决这一问题的各种方法。然而,这些方法中的许多方法利用与文档的主题相关或受其影响的特征。因此,可能会意外地发生他们的验证结果不是基于写作风格(AV的实际重点),而是基于文档的主题。为了解决这个问题,我们提出了另一种AV方法,只考虑主题不可知的功能在其分类决策。此外,我们提出了一个事后解释方法,允许了解哪些特定的功能有助于预测建议的AV方法。为了评估我们的AV方法的性能,我们在四个具有挑战性的数据集上将其与十个竞争基线(包括当前最先进的基线)进行了比较。结果表明,我们的方法在两种情况下优于所有基线(最大准确率为84%),而在其他两种情况下,它的表现以及最强的基线。

英文摘要:

A central problem that has been researched for many years in the field of digital text forensics is the question whether two documents were written by the same author. Authorship verification (AV) is a research branch in this field that deals with this question. Over the years, research activities in the context of AV have steadily increased, which has led to a variety of approaches trying to solve this problem. Many of these approaches, however, make use of features that are related to or influenced by the topic of the documents. Therefore, it may accidentally happen that their verification results are based not on the writing style (the actual focus of AV), but on the topic of the documents. To address this problem, we propose an alternative AV approach that considers only topic-agnostic features in its classification decision. In addition, we present a post-hoc interpretation method that allows to understand which particular features have contributed to the prediction of the proposed AV method. To evaluate the performance of our AV method, we compared it with ten competing baselines (including the current state of the art) on four challenging data sets. The results show that our approach outperforms all baselines in two cases (with a maximum accuracy of 84%), while in the other two cases it performs as well as the strongest baseline.

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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