In this section, we'll be looking at the actual structure of a classical or dense neural network. We'll start off with a sample neural network structure, and then we'll expand that to build a visualization of the network that you would need in order to understand the MNIST digits. Then, finally, we'll learn how the tensor data is actually inserted into a network.
Let's start by looking at the structure of a dense neural network. Using the network package, we will draw a picture of a neural network. The following screenshot shows the three layers that we are setting up—an input layer, an activation layer, and then an output layer—and fully connecting them:
That's what these two loops in the middle are doing. They are putting an edge between every input...