I knew this was going to happen eventually. This might change by the time people read this but the MNIST data set hosted by Yann LeCun is currently returning 503 MNIST handwritten digit database, Yann LeCun, Corinna Cortes and Chris Burges
MNIST is the “hello world” dataset of deep learning and while the dataset is copied to innumerable other locations if you were relying on this one it’s not available. This is why I’ve been saying that all machine learning datasets should be hosted on IPFS.