Combine with dependency parsing and entity for answer syntax pattern learning method

For characteristics of the sentence patterns in restricted domain question- answer system, we proposed an answer syntax pattern learning method combined with dependency syntax and sentence patterns of domain answers entity. Firstly, this method uses labeled type of questions and answers to recall candidate snippets, then dependency parsing and entity recognition are conducted on the snippets to extract the candidate answer sentence patterns. Next, extend the same type of entities to obtain new candidate answer sentence patterns. Finally, get the candidate answer syntax pattern corpus according to the weight of candidate pattern calculated by the frequency and precision of the answers, which retrieved by the candidate patterns. We experimented on the answers extracting by pattern matching, the experimental on web data sets and the accessed pattern data sets show that the pattern learning method could effectively improve the results of extracting answers in the restricted domain.