Kmeans算法是一个重复移动类中心点的过程，把类的中心点，也称重心(centroids)，移动到其包含成员的平均位置，然后重新划分其内部成员。(The Kmeans algorithm is a process of repeating the center point of a moving class, moving the center of the class, also known as centroids, to the average position of its member