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 a word vector from scratch in Python

The principle based on which we'll build a word vector is related words will have similar words surrounding them.

For example: the words queen and princess will have similar words (related to a kingdom) around them more frequently. In a way, the context (surrounding words) of these words would be similar.

Getting ready

Our dataset (of two sentences) looks as follows when we take the surrounding words as input and the remaining (middle) word as output:

Notice that we are using the middle word as output and the remaining words as input. A vectorized form of this input and output looks as follows (recall the way in which we converted a sentence into a vector in the Need for...