在线购物评论为消费者比较商品的质量和其他一些购买特性提供了有用信息，然而却有大量的虚假评论者受利益驱使撰写虚假或者不公正的评论来迷惑消费者。先前的研究一般都是使用文本相似度和评分模式来探测虚假评论，这些算法可以检测特定类型的攻击者，在现实场景中许多虚假评论者刻意模仿正常用户对商品进行评论，因此先前的算法对检测这类攻击效果不佳。本文通过分析评论文本的感情极性，抽取不同的特征并使用逻辑回归模型来检测虚假评论；首先，借用自然语言处理的相关技术来分析评论文本的情感极性，判断每个用户的情感偏离大众情感的程度，如果偏离越大则说明其是虚假评论者的概率就越大；然后再选取其他几个重要特征结合逻辑回归模型进行虚假检测；通过实验对比，表明了该方法取得了较好的效果。%Online shopping reviews provide valuable customer information for comparing the quality of products and several other aspects of future purchases. However, spammers are joining this community to mislead and confuse consumers by writing fake or unfair reviews. To detect the presence of spammers, reviewer styles have been scruti⁃nized for text similarity and rating patterns. These studies have succeeded in identifying certain types of spammers. However, there are other spammers who can manipulate their behaviors such that they are indistinguishable from normal reviewers, and thus, they cannot be detected by available techniques. In this paper, we analyze the orienta⁃tion of comments, extract different features, and use a logic regression model to detect false comments. First, we u⁃tilize natural language processing technology to analyze the orientation of comments and compute the departures of those comments from those of the general public. The greater is the deviation, the greater is the probability of the comment being generated by a spammer. Then, we select several other important features and combine them with the logic regression model to identify fake comments. The experimental results verify the greater accuracy of the pro⁃posed method.
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