摘要： 查询扩展是信息检索中优化查询的一种有效方法。在分析几种基于互信息的查询扩展方法的基础上，将检索词在文档空间中的距离引入到互信息计算中，提出基于向量距离的改进互信息的查询扩展方法。实验结果表明，该方法能够有效提高信息检索中的查询效果。

关键词: 信息检索, 查询扩展, 互信息, 向量距离

Abstract: Query expansion is an effective method to the queries in information retrieval. After analyzing several methods of query expansion based on mutual information, this paper introduces the vector distance between terms in documents space to the improvement of mutual information and brings forward a query expansion method based on vector distance in documents space. Experimental results show that the method can effectively improve the performance in information retrieval.

Key words: information retrieval, query expansion, mutual information, vector distance

中图分类号: 

• TP309