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Word co-occurrence features for text classification
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DOI：10.1016/j.is.2011.02.002.png)
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In this article we propose a data treatment strategy to generate new discriminative features, called compound-features (or c-features), for the sake of text classification. These c-features are composed by terms that co-occur in documents without any restrictions on order or distance between terms within a document. This strategy precedes the classification task, in order to enhance documents with discriminative c-features. The idea is that, when c-features are used in conjunction with single-features, the ambiguity and noise inherent to their bag-of-words representation are reduced. We use c-features composed of two terms in order to make their usage computationally feasible while improving the classifier effectiveness. We test this approach with several classification algorithms and single-label multi-class text collections. Experimental results demonstrated gains in almost all evaluated scenarios, from the simplest algorithms such as kNN (13% gain in micro-average F-1 in the 20 Newsgroups collection) to the most complex one, the state-of-the-art SVM (10% gain in macro-average F-1 in the collection OHSUMED). (C) 2011 Elsevier B.V. All rights reserved.
Keyword:
Classification
Text mining
Feature extraction
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