Convolutional neural networks (CNNs) are extremely flexible objects—so far, we have used them to solve classification problems, making them learn to extract features specific to the task. As shown in Chapter 6, Image Classification Using TensorFlow Hub, the standard architecture of CNNs designed to classify images is made of two parts—the feature extractor, which produces a feature vector, and a set of fully connected layers that classifies the feature vector in the (hopefully) correct class:

The fact that, so far, CNNs have only been used to solve classification problems should not mislead us. These types of networks are extremely powerful, and, especially in their multilayer setting, they can be used to solve many different kinds of problems, extracting...