基于检索历史上下文的个性化查询重构技术研究

基于检索历史隐式地学习用户偏好是个性化检索研究的热点,而根据用户检索历史重构新的查询输入是其中主要的研究内容。已有的研究在利用检索历史进行查询重构时,通常不区分检索历史中的内容是否与当前查询相关,而是将全部检索历史视为整体,因而使重构后的查询含有较多噪声。该文基于相关词语在上下文中大量共现的特征,将用户历史检索结果的网页摘要作为上下文语境,结合用户点击,选择检索历史中与当前查询共现程度最高的词语重构查询模型。对初始检索结果重排序的实验表明,该方法可以有效地选择相关词语,减少噪声。用p@5和NDCG两种指标评价,比最好的基准系统分别相对提高12.8%和7.2%,比初始排序结果相对提高 26.0% 和11.4%。

Personalized Query Reformulation Based on Search Context

Learning user preference implicitly is a hot research topic for personalized search,and query model reformulation based on user search history is a key issue.Existing work considers the search history as a whole without distinguishing whether it is relevant to current query,resulting in much noise.In this paper,assuming that the relevant terms tend to co-occurrence in context,we treat each past snippet as a context and reformulate the query by selecting the most relevant terms to the whole query from the us...