参考案例 http://shenhaolaoshi.blog.sohu.com/201923838.html http://www.360doc.com/content/16/0229/11/3852985_538224195.shtml K-Means 算法 http://baike.baidu.com/link?url=tDnfqJDKLcY1–cQDDOYUBFwsFhxC1WRMB-lRzLBmFQXPpnlhWUs6DkQlt9xH_e-362qNgfFFErQO5BA_E9QPq