Feature selection and feature extraction are common methods for dimensionality reduction.

特征选择和特征抽取是维数约简常用的两种方法。

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The user feature extraction algorithmic in this paper reference from attribute reduction and decision rule extraction of rough set theory.

本文中用户行为特征提取算法的设计主要借鉴了粗糙集理论中的属性约简与规则提取的思想。

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A neural network numeral recognition method based on feature extraction and rough set feature reduction is proposed for numeral recognition of non-pointer instrument dial.

针对无指针式仪表表盘的数字识别问题，提出了一种基于特征提取和粗糙集特征约简的神经网络数字识别方法。

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