说明：  该程序给出了一个1000的采样点的数据源，之后采用随机采样的方法，对其进行恢复。最后给出了原来数据和恢复数据的比较。
(The program gives a 1000 sampling points of data sources, and then using a random sampling method, and its recovery. Finally, the original data and recovery data comparison.)