The code is in the Chapter2 folder of the code for this book. If you have not already downloaded and unzipped the code, go back to Chapter 1, Getting Started with Deep Learning, for the link to download the code. Unzip the code into a folder in your machine, and you will see folders for different chapters. The code we will be following is Chapter2\chapter2.R.
We will use the MNIST dataset to build some neural network models. The first few lines in the script look to see whether the data file (train.csv) is in the data directory. If the file already exists in the data directory then it proceeds; if it isn't, it downloads a ZIP file from https://apache-mxnet.s3-accelerate.dualstack.amazonaws.com/R/data/mnist_csv.zip ...
