Book Image

Hands-On Generative Adversarial Networks with PyTorch 1.x

By : John Hany, Greg Walters
Book Image

Hands-On Generative Adversarial Networks with PyTorch 1.x

By: John Hany, Greg Walters

Overview of this book

With continuously evolving research and development, Generative Adversarial Networks (GANs) are the next big thing in the field of deep learning. This book highlights the key improvements in GANs over generative models and guides in making the best out of GANs with the help of hands-on examples. This book starts by taking you through the core concepts necessary to understand how each component of a GAN model works. You'll build your first GAN model to understand how generator and discriminator networks function. As you advance, you'll delve into a range of examples and datasets to build a variety of GAN networks using PyTorch functionalities and services, and become well-versed with architectures, training strategies, and evaluation methods for image generation, translation, and restoration. You'll even learn how to apply GAN models to solve problems in areas such as computer vision, multimedia, 3D models, and natural language processing (NLP). The book covers how to overcome the challenges faced while building generative models from scratch. Finally, you'll also discover how to train your GAN models to generate adversarial examples to attack other CNN and GAN models. By the end of this book, you will have learned how to build, train, and optimize next-generation GAN models and use them to solve a variety of real-world problems.
Table of Contents (15 chapters)
Free Chapter
1
Section 1: Introduction to GANs and PyTorch
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Section 2: Typical GAN Models for Image Synthesis

CGANs – how are labels used?

In the previous chapter, we learned that a relation between the latent vector and the generated images can be established by the training process of GANs and certain manipulation of the latent vectors is reflected by the changes in the generated images. But we have no control over what part or what kinds of latent vectors would give us images with the attributes we want. To address this issue, we will use a CGAN to add label information in the training process so that we can have a say in what kinds of images the model will generate.

The idea of CGANs was proposed by Mehdi Mirza and Simon Osindero in their paper, Conditional Generative Adversarial Nets. The core idea was to integrate the label information into both generator and discriminator networks so that the label vector would alter the distribution of latent vectors, which leads to images...