Affiliations: Department of Computer Science, Faculty of Mathematics and Computer Science, University of Bucharest, Romania, fhristea@fmi.unibuc.ro | Department of Computer Science, Faculty of Exact Sciences, University of Craiova, Romania, mcolhon@inf.ucv.ro
Note: [] Address for correspondence: Department of Computer Science, Faculty of Mathematics and Computer Science, University of Bucharest, 14, Academiei Str., Bucharest, Sector 1, C.P. 010014, Romania
Abstract: The present paper concentrates on the issue of feature selection for unsupervised word sense disambiguation (WSD) performed with an underlying Naïve Bayes model. It introduces dependency-based feature selection which, to our knowledge, is used for the first time in conjunction with the Naïve Bayes model acting as clustering technique. Construction of the dependency-based semantic space required for the proposed task is discussed. The resulting disambiguation method, representing an extension of the method introduced in [15], lies at the border between unsupervised and knowledge-based techniques. Syntactic knowledge provided by dependency relations (and exemplified in the case of adjectives) is hereby compared to semantic knowledge offered by the semantic network WordNet (and examined in [15]). Our conclusion is that the Naïve Bayes model reacts well in the presence of syntactic knowledge of this type and that dependency-based feature selection is a reliable alternative to the WordNet-based semantic one.
Keywords: Unsupervised word sense disambiguation, Bayesian classification, The EM algorithm, WordNet, Dependency relations, Dependency-based feature selection
