建模网址

http://mcm.dept.ccut.edu.cn/sort.asp?5x3g1t3W2B1R1.html

https://www.julyedu.com/七月在线教育关于数学、算法、尝试学习

https://www.52ml.net/1868.html我爱机器学习

轮廓系数的应用：kmeans聚类理论篇K的选择（轮廓系数）http://blog.csdn.net/qq_17754181/article/details/51614791

KNN(k-nearest neighbor algorithm)--从原理到实现http://blog.csdn.net/qq_17754181/article/details/45270853

http://mt.sohu.com/20160724/n460776340.shtml