arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1908.10193cs.IR
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一种基于伪相关Web知识的查询扩展模型

A novel model for query expansion using pseudo-relevant web knowledge

Hiteshwar Kumar Azad, Akshay Deepak

摘要:

在信息检索领域,查询扩展(QE)一直被用作处理用户查询与目标信息之间的词不匹配的基本问题的技术。在查询词与扩展词之间的关系上下文中,现有的加权技术往往不能恰当地捕捉词与词之间的关系以及词与整个查询词之间的关系,导致检索效率较低。我们提出的QE方法通过提出三个加权模型来解决这个问题,这三个加权模型基于(1)tf-itf,(2)基于k-最近邻(kNN)的余弦相似性,以及(3)相关性得分。此外,为了提取扩展术语的初始集合,我们使用由三个流行的搜索引擎即Google、Bing和DuckDuckGo返回的前N个网页组成的伪相关网络知识来响应原始查询。在这三个加权模型中,tf-itf对从网络内容中获得的每个单独术语进行评分,基于kNN的余弦相似度对扩展术语进行评分以获得术语与术语的关系,相关性评分对选定的扩展术语相对于整个查询进行加权。该模型被称为基于Web知识的查询扩展(WKQE),在FIRE数据集上,与未扩展的查询相比,MAP得分提高了25.89%,GMAP得分提高了30.83%。与其他相关方法的WKQE技术的比较分析清楚地表明显着改善检索性能。我们还分析了不同数量的伪相关文档和扩展条款的检索效果的建议模型。

英文摘要:

In the field of information retrieval, query expansion (QE) has long been used as a technique to deal with the fundamental issue of word mismatch between a user's query and the target information. In the context of the relationship between the query and expanded terms, existing weighting techniques often fail to appropriately capture the term-term relationship and term to the whole query relationship, resulting in low retrieval effectiveness. Our proposed QE approach addresses this by proposing three weighting models based on (1) tf-itf, (2) k-nearest neighbor (kNN) based cosine similarity, and (3) correlation score. Further, to extract the initial set of expanded terms, we use pseudo-relevant web knowledge consisting of the top N web pages returned by the three popular search engines namely, Google, Bing, and DuckDuckGo, in response to the original query. Among the three weighting models, tf-itf scores each of the individual terms obtained from the web content, kNN-based cosine similarity scores the expansion terms to obtain the term-term relationship, and correlation score weighs the selected expansion terms with respect to the whole query. The proposed model, called web knowledge based query expansion (WKQE), achieves an improvement of 25.89% on the MAP score and 30.83% on the GMAP score over the unexpanded queries on the FIRE dataset. A comparative analysis of the WKQE techniques with other related approaches clearly shows significant improvement in the retrieval performance. We have also analyzed the effect of varying the number of pseudo-relevant documents and expansion terms on the retrieval effectiveness of the proposed model.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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