标签：
https://en.wikipedia.org/wiki/K-means_clustering
http://www.cnblogs.com/leoo2sk/archive/2010/09/20/k-means.html
http://www.cs.cmu.edu/~guestrin/Class/10701-S07/Slides/clustering.pdf
k-means
原文地址：http://www.cnblogs.com/WCFGROUP/p/5559651.html
