MNIST数据集比较小,一般入门机器学习都会采用这个数据集来训练 下载地址:yann.lecun.com/exdb/mnist/ 有4个有用的文件: train-images-idx3-ubyte: training set images train-labels-idx1-ubyte: training set labels t10k-images-idx3-ubyte: test set images t10k-labels-idx1-ubyte: test set labels The training set contains 60000 examples, and the t