2003 | OriginalPaper | Buchkapitel
Combining Naive Bayes and n-Gram Language Models for Text Classification
verfasst von : Fuchun Peng, Dale Schuurmans
Erschienen in: Advances in Information Retrieval
Verlag: Springer Berlin Heidelberg
Enthalten in: Professional Book Archive
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We augment the naive Bayes model with an n-gram language model to address two shortcomings of naive Bayes text classifiers. The chain augmented naive Bayes classifiers we propose have two advantages over standard naive Bayes classifiers. First, a chain augmented naive Bayes model relaxes some of the independence assumptions of naive Bayes— allowing a local Markov chain dependence in the observed variables—while still permitting efficient inference and learning. Second, smoothing techniques from statistical language modeling can be used to recover better estimates than the Laplace smoothing techniques usually used in naive Bayes classification. Our experimental results on three real world data sets show that we achieve substantial improvements over standard naive Bayes classification, while also achieving state of the art performance that competes with the best known methods in these cases.