中文说明：在做人脸识别时，测试集和训练集是分别放在一个文件夹里，然后再放入一个大文件夹里，而测试集和训练集文件夹下面又分为多个人，每个人一个文件夹，每个人下面又有几张图片，本程序能够遍历数据集里的任意图片。代码都差不多，只要你改改相对路径就可以用了
English Description：
When do face recognition, the test set and the training set is separately placed in a folder, and then placed in a large folder, and the test set and the training set is divided into the following folders more than one person, each person in a folder everyone have a few pictures below, this program can traverse the data set of any picture. Codes are similar, as long as you make a change you can use a relative path