Hands-On Machine Learning with C++

The backpropagation method – an example

To understand how the backpropagation method works, let's look at an example.

We'll introduce the following indexing for all expression elements: is the index of the layer, is the index of the neuron in the layer, and is the index of the current element or connection (for example, weight). We use these indexes as follows:

This expression should be read as the element of the neuron in the layer.

Let's ...