说明：  ID3决策树程序，内含训练和测试数据。 输入为选择原训练数据集和测试数据集的百分数，如0.25。根据实验要求，测试数据都选全部，故都输入1。 输出结果为实验要求的实验数据结果。
(ID3 decision tree procedures, including training and test data. Input for the selection of the original training data set and test data set percentage, such as 0.25. According to the experimental requirements, the test data are the election of all, ancient capital input 1. Output requirements for the experimental results of the experimental data.)