(a) Visualization of the MNIST dataset. Each image is $28 \times 28$. There are 60k training examples and 10k test examples. We show the first 25 images from the training set. Generated by mnist_viz_tf.ipynb . (b) Visualization of the EMNIST dataset. There are 697,932 training examples, and 116,323 test examples, each of size $28 \times 28$. There are 62 classes (a-z, A-Z, 0-9). We show the first 25 images from the training set. Generated by emnist_viz_jax.ipynb .