Book Image

Neural Networks with Keras Cookbook

By : V Kishore Ayyadevara
Book Image

Neural Networks with Keras Cookbook

By: V Kishore Ayyadevara

Overview of this book

This book will take you from the basics of neural networks to advanced implementations of architectures using a recipe-based approach. We will learn about how neural networks work and the impact of various hyper parameters on a network's accuracy along with leveraging neural networks for structured and unstructured data. Later, we will learn how to classify and detect objects in images. We will also learn to use transfer learning for multiple applications, including a self-driving car using Convolutional Neural Networks. We will generate images while leveraging GANs and also by performing image encoding. Additionally, we will perform text analysis using word vector based techniques. Later, we will use Recurrent Neural Networks and LSTM to implement chatbot and Machine Translation systems. Finally, you will learn about transcribing images, audio, and generating captions and also use Deep Q-learning to build an agent that plays Space Invaders game. By the end of this book, you will have developed the skills to choose and customize multiple neural network architectures for various deep learning problems you might encounter.
Table of Contents (18 chapters)

Building an RNN from scratch in Python

In this recipe, we will build an RNN from scratch using a toy example, so that you gain a solid intuition of how RNN helps in solving the problem of taking the order of events (words) into consideration.

Getting ready

Note that a typical NN has an input layer, followed by an activation in the hidden layer, and then a softmax activation at the output layer.

RNN follows a similar structure, with modifications done in such a way that the hidden layers of the previous time steps are considered in the current time step.

We'll build the working details of RNN with a simplistic example before implementing it on more practical use cases.

Let's consider an example text that looks as...