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This is nice work, but anyone wanting to try it for themselves should be warned that you shouldn't unpickle data received from an untrusted source.

I copied this method of loading datasets from Keras. https://github.com/fchollet/keras/blob/master/keras/datasets.... What's a better alternative.

Another serialization format which doesn't create objects, like JSON, XML, CSV,...

glad to see this as the first comment

Anti-pickler.