It applies the concept and association expansion to text feature vectors in order to reduce the relevant degree of terms and enhance the ability to represent the text theme.
其基本思想是：对于文本特征向量进行概念扩充，减少特征项之间的相关性，增强特征项的表现能力。
Reducing the high dimension of feature vectors is an essential part of text categorization.
对高维的特征集进行降维是文本分类过程中的一个重要环节。
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