MNIST training data from yann lecun is not available (503 Service Unavailable)

[YeonghyeonKO]

When I tried to run uncertainty_estimation.py, it had kept returned 503 Service Unavailable error.

Since the link for downloading mnist/train-labels-idx1-ubyte.gz is unavailable now, would you change the code not to access here ? (Even I downloaded notMNIST_small.tar and put it into /data, the codes tries to search the link so returns 503 error.