Data mining is an important problem in KDD, and Rough set as a theory of set with fuzzy boundary is widely applied to infer classification rules from decision system.
数据挖掘是知识发现领域的一个重要问题，粗糙集理论是一种具有模糊边界的数据挖掘方法，它被广泛应用于决策系统的分类规则提取中。
Calculating the mean of each type of data points, and the two average points in a line segment, the segment with a vertical split line as the classification boundary.
计算每类数据的均值点，并且把两个均值点连成一线段，用垂直平分该线段的直线作为分类边界。
The study on the outer configuration of terrigenous sequence in Biyang fault depression includes sequence classification and boundary identification.
泌阳断陷陆相层序外部构型研究包括层序级别的厘定与划分以及界面的类型及其识别标志。
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