Answer Extracting Based on Passage Retrieval in Chinese Question Answering System

摘要

Passage retrieval is a base of answer extracting in Chinese question answering system.In order to improve the precision of the passage retrieval which includes answers, this paper analyze first existing passage retrieval methods,and point to their shortcomings, then put forward a new method of passage retrieval, in which factors are considered ,such as frequency of query words and query expansion words in passage, the length of passage, the distribution density and minimum match span of query words and query expansion words in passage ,when calculating passage weight.The new method can realize passage retrieval on the basis of the weight calculation, and obtain optimization answers passage. Final, experiment result of answer extracting based on passage retrieval have shown that the method given has better effect.