Intro
The MNIST dataset of handwritten digits has a training set of 60,000 examples, and a test set of 10,000 examples. It’s used for image recognition, preprocessing, and machine learning
The MNIST database of handwritten digits (http://yann.lecun.com)
MNIST is a classic data set of handwritten digits. It was compiled in the 1990s, and has been used to evaluate image recognition algorithms ever since.
Each example is a square grid of 28 pixels by 28 pixels