40 Algorithms Every Programmer Should Know

Defining a Keras model

There are three steps involved in defining a complete Keras model:

1. Define the layers.

We can build a model using Keras in two possible ways:

• The Sequential API: This allows us to architect models for a linear stack of layers. It is used for relatively simple models and is the usual choice for building models:

Note that, here, we have created three layers – the first two layers have the ReLU activation function and the third layer has softmax as the activation function.

• The Functional API: This allows us to architect models for acyclic graphs of layers. More complex models can be created using the Functional API. ...