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arXiv 1012.2609cs.LGcs.AI
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一种基于类别频度的监督词加权文本分类方法

Inverse-Category-Frequency based supervised term weighting scheme for text categorization

Beihang University(北京航空航天大学)

Deqing Wang, Hui Zhang

摘要:

在kNN、基于质心的分类器和支持向量机等分类器中,项加权策略往往决定着分类器的性能。文本分类中广泛使用的术语加权方案,即,idf,起源于信息检索领域。在文本分类中,idf的直观性似乎不如IR。本文将逆类别频率(icf)引入到术语加权方案中,提出了两种新的方法,即,tf.ICF和基于ICF的监督术语加权方案。icf采用icf来代替idf因子,并且倾向于出现在较少类别中的术语,而不是较少文档。基于icf的方法结合icf和相关频率(rf)以监督的方式对术语进行加权。我们的跨分类器和跨语料库的实验表明,我们提出的方法是优于或相当于六个监督术语加权方案和三个传统的计划,在宏观F1和微观F1。

英文摘要:

Term weighting schemes often dominate the performance of many classifiers, such as kNN, centroid-based classifier and SVMs. The widely used term weighting scheme in text categorization, i.e., tf.idf, is originated from information retrieval (IR) field. The intuition behind idf for text categorization seems less reasonable than IR. In this paper, we introduce inverse category frequency (icf) into term weighting scheme and propose two novel approaches, i.e., tf.icf and icf-based supervised term weighting schemes. The tf.icf adopts icf to substitute idf factor and favors terms occurring in fewer categories, rather than fewer documents. And the icf-based approach combines icf and relevance frequency (rf) to weight terms in a supervised way. Our cross-classifier and cross-corpus experiments have shown that our proposed approaches are superior or comparable to six supervised term weighting schemes and three traditional schemes in terms of macro-F1 and micro-F1.

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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