Enriching basic features via multilayer bag‐of‐words binding for Chinese question classification

Abstract

Question classification helps to generate more accurate answers in question answering system. For an efficient question classifier, one of the most important tasks is to fully mine useful features. Aiming at solving the problem of lacking of rich syntax and semantic features in Chinese question classification, an operator called MBWB (multilayer bag-of-words binding) is proposed to extract potential features by binding part-of-speech, word sense, named entity and other basic features to bag-of-words, respectively. Through performing MBWB operator on two kinds of bag-of-words, i.e. A_BOW and T_BOW, the corresponding A_MBWB and T_MBWB features are generated automatically. The MBWB operator can explore potential information contained in basic features, and enrich syntactic and semantic representation of questions. Experimental results on the Chinese question set show that the classification accuracy gets significantly improved when combining two kinds of MBWB features with basic features.