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 (13 chapters)
12
Index

Principles of autoencoders


In this section, we're going to go over the principles of autoencoders. In this section, we're going to be looking at autoencoders with the MNIST dataset, which we were first introduced to in the previous chapters.

Firstly, we need to be made aware that an autoencoder has two operators, these are:

  • Encoder: This transforms the input, x, into a low-dimensional latent vector, z = f(x). Since the latent vector is of low dimension, the encoder is forced to learn only the most important features of the input data. For example, in the case of MNIST digits, the important features to learn may include writing style, tilt angle, roundness of stroke, thickness, and so on. Essentially, these are the most important information needed to represent digits zero to nine.

  • Decoder: This tries to recover the input from the latent vector,

    . Although the latent vector has a low dimension, it has a sufficient size to allow the decoder to recover the input data.

The goal of the decoder...