K均值算法的实现，其中实现随机获取聚类中心-Realizing the K-means algorithm, which realize stochastic get clustering center

DBSCAN是一个基于密度的聚类算法,改算法将具有足够高度的区域划分为簇-DBSCAN is a density based clustering algorithm, the algorithm will have enough height area is divided into clusters