arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1502.04331cs.IR
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信息检索中的两阶段文档长度规范化

Two-Stage Document Length Normalization for Information Retrieval

Seung-Hoon Na

摘要:

词频规范化的标准方法仅基于文档长度。然而,它并没有区分冗长和范围,这是决定文件长度的两个主要因素。由于冗长和范围对词频的增加有很大不同的影响,标准方法很容易受到不足或过度惩罚,这取决于长文档的具体类型。为了克服这些问题,本文提出了两个阶段的规范化分别执行冗长和范围规范化,并采用不同的惩罚函数。在冗长度规范化中,通过将术语频率除以文档的冗长度来预规范化每个文档。在范围规范化中,现有的检索模型以直接的方式应用于预规范化的文档,最后导致我们制定我们提出的冗长规范化(VN)检索模型。标准TREC集合上进行的实验结果表明,VN模型导致边际,但统计上显着的改进,标准的检索模型。

英文摘要:

The standard approach for term frequency normalization is based only on the document length. However, it does not distinguish the verbosity from the scope, these being the two main factors determining the document length. Because the verbosity and scope have largely different effects on the increase in term frequency, the standard approach can easily suffer from insufficient or excessive penalization depending on the specific type of long document. To overcome these problems, this paper proposes two-stage normalization by performing verbosity and scope normalization separately, and by employing different penalization functions. In verbosity normalization, each document is pre-normalized by dividing the term frequency by the verbosity of the document. In scope normalization, an existing retrieval model is applied in a straightforward manner to the pre-normalized document, finally leading us to formulate our proposed verbosity normalized (VN) retrieval model. Experimental results carried out on standard TREC collections demonstrate that the VN model leads to marginal but statistically significant improvements over standard retrieval models.

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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