Automatic answer ranking based on sememe vector in KBQA

This paper proposes an answer ranking method used in Knowledge Base Question Answering (KBQA) system. This method first extracts the features of predicate sequence similarity based on sememe vector, predicates' edit distances, predicates' word co-occurrences and classification. Then the above features are used as inputs of the ranking learning algorithm Ranking SVM to rank the candidate answers. In this paper, the experimental results on the data set of KBQA system evaluation task in the 2016 Natural Language Processing & Chinese Computing (NLPCC 2016) show that, the method of word similarity calculation based on sememe vector has better results than the method based on word2vec. Its accuracy, recall rate and average F1 value respectively are 73.88%, 82.29% and 75.88%. The above results show that the word representation with knowledge has import effect on natural language processing.