Book Image

Hands-On Image Generation with TensorFlow

By : Soon Yau Cheong
Book Image

Hands-On Image Generation with TensorFlow

By: Soon Yau Cheong

Overview of this book

The emerging field of Generative Adversarial Networks (GANs) has made it possible to generate indistinguishable images from existing datasets. With this hands-on book, you’ll not only develop image generation skills but also gain a solid understanding of the underlying principles. Starting with an introduction to the fundamentals of image generation using TensorFlow, this book covers Variational Autoencoders (VAEs) and GANs. You’ll discover how to build models for different applications as you get to grips with performing face swaps using deepfakes, neural style transfer, image-to-image translation, turning simple images into photorealistic images, and much more. You’ll also understand how and why to construct state-of-the-art deep neural networks using advanced techniques such as spectral normalization and self-attention layer before working with advanced models for face generation and editing. You'll also be introduced to photo restoration, text-to-image synthesis, video retargeting, and neural rendering. Throughout the book, you’ll learn to implement models from scratch in TensorFlow 2.x, including PixelCNN, VAE, DCGAN, WGAN, pix2pix, CycleGAN, StyleGAN, GauGAN, and BigGAN. By the end of this book, you'll be well versed in TensorFlow and be able to implement image generative technologies confidently.
Table of Contents (15 chapters)
1
Section 1: Fundamentals of Image Generation with TensorFlow
5
Section 2: Applications of Deep Generative Models
9
Section 3: Advanced Deep Generative Techniques

Implementing BigGAN

The BigGAN is an improved version of the SAGAN. The BigGAN ups the image resolution significantly from 128×128 to 512×512, and it does it without progressive growth of layers! The following are some sample images generated by BigGAN:

Figure 8.5 – Class-conditioned samples generated by BigGAN at 512x512 (Source: A. Brock et al., 2018, "Large Scale GAN Training for High Fidelity Natural Image Synthesis," https://arxiv.org/abs/1809.11096)

BigGAN is considered the state-of-the-art class-conditional GAN. We'll now look into the changes and modify the SAGAN code to make ourselves a BigGAN.

Scaling GANs

Older GANs tend to use small batch sizes as that would produce better-quality images. Now we know that the quality problem was caused by the batch statistics used in batch normalization, and this is addressed by using other normalization techniques. Still, the batch size has remained small as it is physically...