Book Image

Advanced Deep Learning with Keras

By : Rowel Atienza
Book Image

Advanced Deep Learning with Keras

By: Rowel Atienza

Overview of this book

Recent developments in deep learning, including Generative Adversarial Networks (GANs), Variational Autoencoders (VAEs), and Deep Reinforcement Learning (DRL) are creating impressive AI results in our news headlines - such as AlphaGo Zero beating world chess champions, and generative AI that can create art paintings that sell for over $400k because they are so human-like. Advanced Deep Learning with Keras is a comprehensive guide to the advanced deep learning techniques available today, so you can create your own cutting-edge AI. Using Keras as an open-source deep learning library, you'll find hands-on projects throughout that show you how to create more effective AI with the latest techniques. The journey begins with an overview of MLPs, CNNs, and RNNs, which are the building blocks for the more advanced techniques in the book. You’ll learn how to implement deep learning models with Keras and TensorFlow 1.x, and move forwards to advanced techniques, as you explore deep neural network architectures, including ResNet and DenseNet, and how to create autoencoders. You then learn all about GANs, and how they can open new levels of AI performance. Next, you’ll get up to speed with how VAEs are implemented, and you’ll see how GANs and VAEs have the generative power to synthesize data that can be extremely convincing to humans - a major stride forward for modern AI. To complete this set of advanced techniques, you'll learn how to implement DRL such as Deep Q-Learning and Policy Gradient Methods, which are critical to many modern results in AI.
Table of Contents (16 chapters)
Advanced Deep Learning with Keras
Contributors
Preface
Other Books You May Enjoy
Index

Implementing CycleGAN using Keras


Let us tackle a simple problem that CycleGAN can address. In Chapter 3, Autoencoders, we used an autoencoder to colorize grayscale images from the CIFAR10 dataset. We can recall that the CIFAR10 dataset is made of 50,000 trained data and 10,000 test data samples of 32 × 32 RGB images belonging to ten categories. We can convert all color images into grayscale using rgb2gray(RGB) as discussed in Chapter 3, Autoencoders.

Following on from that, we can use the grayscale train images as source domain images and the original color images as the target domain images. It's worth noting that although the dataset is aligned, the input to our CycleGAN is a random sample of color images and a random sample of grayscale images. Thus, our CycleGAN will not see the train data as aligned. After training, we'll use the test grayscale images to observe the performance of the CycleGAN:

Figure 7.1.6: The forward cycle generator G, implementation in Keras. The generator is a U...