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CoFea: A Novel Approach to Spam Review Identification Based on Entropy and Co-Training

Center for Reseach on Big Data Sciences, Beijing University of Chemical Technology, Beijing 100029, China
School of Knowledge Science, Japan Advanced Institute of Science and Technology, 1-1 Ashahidai, Nomi City, Ishikawa 923-1292, Japan
Institute of Policy and Management, Chinese Academy of Sciences, Beijing 100190, China
Author to whom correspondence should be addressed.
Entropy 2016, 18(12), 429;
Received: 20 October 2016 / Accepted: 28 November 2016 / Published: 30 November 2016
With the rapid development of electronic commerce, spam reviews are rapidly growing on the Internet to manipulate online customers’ opinions on goods being sold. This paper proposes a novel approach, called CoFea (Co-training by Features), to identify spam reviews, based on entropy and the co-training algorithm. After sorting all lexical terms of reviews by entropy, we produce two views on the reviews by dividing the lexical terms into two subsets. One subset contains odd-numbered terms and the other contains even-numbered terms. Using SVM (support vector machine) as the base classifier, we further propose two strategies, CoFea-T and CoFea-S, embedded with the CoFea approach. The CoFea-T strategy uses all terms in the subsets for spam review identification by SVM. The CoFea-S strategy uses a predefined number of terms with small entropy for spam review identification by SVM. The experiment results show that the CoFea-T strategy produces better accuracy than the CoFea-S strategy, while the CoFea-S strategy saves more computing time than the CoFea-T strategy with acceptable accuracy in spam review identification. View Full-Text
Keywords: spam review; co-training; CoFea spam review; co-training; CoFea
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Zhang, W.; Bu, C.; Yoshida, T.; Zhang, S. CoFea: A Novel Approach to Spam Review Identification Based on Entropy and Co-Training. Entropy 2016, 18, 429.

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