mnist.npz not include val file

[wushaoling540]

After I download the file mnist.npz from the url "https://s3.amazonaws.com/img-datasets/mnist.npz", it only includes four files in directory: x_train.npy x_test.npy y_train.npy y_test.npy the val files(what I mean the z files) don't be found anywhere.Can any one share the correct url or dataset? I will incredibly appreciate for you!!