基于事件元素无向图的查询扩展方法

A Query Expansion Method Based on Undirected Graph of Event Elements

借助新闻事件元素之间的关联特性,提出了基于事件元素无向图的查询扩展方法,利用新闻事件元素之间的关联关系进行查询扩展提升新闻事件检索效果。首先分析候选事件文档与查询项的关系,确定待扩展的元素;然后利用事件元素之间的关联关系构建无向图,通过事件向量空间计算边的权重;最后,利用无向图节点权重模型计算事件元素权重,依据权重进行事件元素扩展。在新闻事件查询扩展方面进行了对比试验,结果表明该文提出的查询扩展方法取得了较好的效果。

This paper proposes a query expansion method based on undirected graph of event elements, which utilizes the relevance between news event elements to conduct query expansion to improve news event retrieval. Firstly, we select out the elements to be extended by analyzing the relationship betweencandidate events and queries. Then, we construct an undirected graph to represent the extracted event elements and the relationship between them, and compute the edge weights through event vector space. Finally, we compute the weight of event elements by the undirected graph model of node weight, and extend event elements according to the weights computed. Experimented on news event query expansion data, it is proved that the proposed query expansion method has a good effect on news event retrieval.