基于Dempster-Shafer理论的查询扩展模型(英文)

被引:4
作者
王明文
聂建云
机构
[1] 江西师范大学计算机信息工程学院
[2] DIRO
[3] UniversitédeMontréal
[4] CP
[5] succursaleCentre-ville 江西南昌 DIRO
[6] succursaleCentre-ville
[7] MontrealQuebec
[8] HCJ
[9] Canada
关键词
信息检索; 查询扩展; Dempster-Shafer理论;
D O I
10.16357/j.cnki.issn1000-5862.2005.03.007
中图分类号
TP391.3 [检索机];
学科分类号
081203 ; 0835 ;
摘要
查询扩展是提高信息检索召回率的有效方法,已有许多研究者提出了诸多扩展方法,但大多数方法均是简单地把扩展的词添加到查询中.这样如若不加区分原查询词和扩充词,则扩展后的查询就可能偏离原查询的语义.该文基于Dempster-Shafer证据理论,提出了一个查询扩展的计算模型,该模型把原始查询项看作主证据,扩展项为原始查询项的辅助证据,为了能组合这两类证据,该文给出了两个带权重的Dempster-Shafer组合规则,实验表明该方法能有效地提高检索效率.
引用
收藏
页码:210 / 216
页数:7
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