一种基于语义单元的查询扩展方法

A Query Expansion Method Based on Semantic Element

查询扩展技术通过向初始查询请求中加入相似或者相关的词,来减少查询请求与相关文献在表达上的不匹配现象,改善检索性能。本文利用语义单元的语义表达能力和语义单元之间的关系,将与初始查询具有密切语义关系的查询词或短语加入到初始查询请求中,更加全面地表示了用户的查询意愿。算法的时间复杂度为O(L),只与搜索请求的长度L有关,与语义单元表示库的规模无关,这对实时性要求较高的搜索引擎来讲是很实用的。

Query Expansion technology can reduce word mismatch between query and related documents, improve retrieval result through adding similar or related terms to original query. In the algorithm proposed in this paper, terms or phrases which have closely related sense are added to the original query and express users~ query intention more precisely. This algorithm costs O（L） time which is independent of the SER-Base, and this is very practical for highly realtime search engine.