Stacked MNIST

The Stacked MNIST dataset is derived from the standard MNIST dataset with an increased number of discrete modes. 240,000 RGB images in the size of 32×32 are synthesized by stacking three random digit images from MNIST along the color channel, resulting in 1,000 explicit modes in a uniform distribution corresponding to the number of possible triples of digits.

Source: Inclusive GAN: Improving Data and Minority Coverage in Generative Models Image Source: https://arxiv.org/abs/1705.07761