MNIST neural network training and testing

Full code and functions for training and testing a simple neural network to recognize single digits between 0 and 9

Full code and functions for training and testing a simple neural network to recognize single digits between 0 and 9. The network has two hidden layers with 80 and 60 neurons respectively (easy to change). Accuracy about 97 %. Please comment if you find any better parameters!

How to run:
1. Make sure all the files are in your current folder.
2. Run "digit_train.m" (will probably take about 5-20 minutes depending on your computer).
3.Run "digit_test.m" to test and evaluate your network.