# reference: http://vision.stanford.edu/teaching/cs131_fall1314_nope/lectures/lecture13_kmeans_cs131.pdf
# reference: http://www.cnblogs.com/liqizhou/archive/2012/05/12/2497220.html
# reference: https://spin.atomicobject.com/2015/05/26/mean-shift-clustering/
# reference: https://github.com/mattnedrich/MeanShift_py

