arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1602.01665cs.IR
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基于伪相关Pólya文档模型的查询主题模型改进

Improved Query Topic Models via Pseudo-Relevant Pólya Document Models

Ronan Cummins

摘要:

基于伪相关反馈的查询扩展是克服词汇不匹配问题和提高检索效率的一种常用方法。在本文中,我们开发了一种新的方法,估计一个查询主题模型从一组伪相关的文件,使用一个新的语言建模框架。我们假设文档是通过多变量Polya分布的混合生成的,并且我们表明,通过识别每个文档中的主题术语,我们可以适当地选择可能属于查询主题模型的术语。几个TREC集合的实验结果表明,新的方法相比,目前国家的最先进的扩展方法。

英文摘要:

Query-expansion via pseudo-relevance feedback is a popular method of overcoming the problem of vocabulary mismatch and of increasing average retrieval effectiveness. In this paper, we develop a new method that estimates a query topic model from a set of pseudo-relevant documents using a new language modelling framework. We assume that documents are generated via a mixture of multivariate Polya distributions, and we show that by identifying the topical terms in each document, we can appropriately select terms that are likely to belong to the query topic model. The results of experiments on several TREC collections show that the new approach compares favourably to current state-of-the-art expansion methods.

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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