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rotMNIST dataset
The rotMNIST dataset contains 28 × 28 grayscale images of digits from 0 to 9, randomly rotated by an angle uniformly distributed from 0 to 2π. -
Morpho-MNIST
The dataset used in the paper is Morpho-MNIST, which contains 60,000 images each of "normal" and "transformed" digits, which are drawn with a thinner and thicker stroke.