Book Image

Deep Learning with TensorFlow and Keras – 3rd edition - Third Edition

By : Amita Kapoor, Antonio Gulli, Sujit Pal
5 (2)
Book Image

Deep Learning with TensorFlow and Keras – 3rd edition - Third Edition

5 (2)
By: Amita Kapoor, Antonio Gulli, Sujit Pal

Overview of this book

Deep Learning with TensorFlow and Keras teaches you neural networks and deep learning techniques using TensorFlow (TF) and Keras. You'll learn how to write deep learning applications in the most powerful, popular, and scalable machine learning stack available. TensorFlow 2.x focuses on simplicity and ease of use, with updates like eager execution, intuitive higher-level APIs based on Keras, and flexible model building on any platform. This book uses the latest TF 2.0 features and libraries to present an overview of supervised and unsupervised machine learning models and provides a comprehensive analysis of deep learning and reinforcement learning models using practical examples for the cloud, mobile, and large production environments. This book also shows you how to create neural networks with TensorFlow, runs through popular algorithms (regression, convolutional neural networks (CNNs), transformers, generative adversarial networks (GANs), recurrent neural networks (RNNs), natural language processing (NLP), and graph neural networks (GNNs)), covers working example apps, and then dives into TF in production, TF mobile, and TensorFlow with AutoML.
Table of Contents (23 chapters)
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Index

Flow-based models for data generation

While both VAEs (Chapter 8, Autoencoders) and GANs do a good job of data generation, they do not explicitly learn the probability density function of the input data. GANs learn by converting the unsupervised problem to a supervised learning problem.

VAEs try to learn by optimizing the maximum log-likelihood of the data by maximizing the Evidence Lower Bound (ELBO). Flow-based models differ from the two in that they explicitly learn data distribution . This offers an advantage over VAEs and GANs, because this makes it possible to use flow-based models for tasks like filling incomplete data, sampling data, and even identifying bias in data distributions. Flow-based models accomplish this by maximizing the log-likelihood estimation. To understand how, let us delve a little into its math.

Let be the probability density of data D, and let be the probability density approximated by our model M. The goal of a flow-based model is to find the...