首先，利用“类属函数”对原始样本进行预处理，以提高聚类样本的质量；

At first, the original samples were pretreated by using the membership class function that can improve the quality of cluster sample.

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该函数通常执行一些初始化例行程序，比如，设置类属性的默认值。

This function usually performs some initialization routines such as setting default values of class properties.

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类属性的任何函数对象都为那个类的实例定义了一个方法。

Any function object that is a class attribute defines a method for instances of that class.

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