说明：  在Weka平台运行的ID3算法，对普通的ID3算法做了一点改进，有四个不同的改进，对应了四个不同的算法，适合实验报告和课程报告。直接可以运行，无需调试。
(The ID3 algorithm running on the Weka platform has made a little improvement on the ordinary ID3 algorithm. There are four different improvements, corresponding to four different algorithms, which are suitable for experiment reports and course reports. It can run directly without debugging.)