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)
21
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Index

Pretraining

As you have learned earlier, the original transformer had an encoder-decoder architecture. However, the research community understood that there are situations where it is beneficial to have only the encoder, or only the decoder, or both.

Encoder pretraining

As discussed, these models are also called auto-encoding and they use only the encoder during the pretraining. Pretraining is carried out by masking words in the input sequence and training the model to reconstruct the sequence. Typically, the encoder can access all the input words. Encoder-only models are generally used for classification.

Decoder pretraining

Decoder models are referred to as autoregressive. During pretraining, the decoder is optimized to predict the next word. In particular, the decoder can only access all the words positioned before a given word in the sequence. Decoder-only models are generally used for text generation.

Encoder-decoder pretraining

In this case, the model...