Book Image

Mastering PyTorch

By : Ashish Ranjan Jha
Book Image

Mastering PyTorch

By: Ashish Ranjan Jha

Overview of this book

Deep learning is driving the AI revolution, and PyTorch is making it easier than ever before for anyone to build deep learning applications. This PyTorch book will help you uncover expert techniques to get the most out of your data and build complex neural network models. The book starts with a quick overview of PyTorch and explores using convolutional neural network (CNN) architectures for image classification. You'll then work with recurrent neural network (RNN) architectures and transformers for sentiment analysis. As you advance, you'll apply deep learning across different domains, such as music, text, and image generation using generative models and explore the world of generative adversarial networks (GANs). You'll not only build and train your own deep reinforcement learning models in PyTorch but also deploy PyTorch models to production using expert tips and techniques. Finally, you'll get to grips with training large models efficiently in a distributed manner, searching neural architectures effectively with AutoML, and rapidly prototyping models using PyTorch and fast.ai. By the end of this PyTorch book, you'll be able to perform complex deep learning tasks using PyTorch to build smart artificial intelligence models.
Table of Contents (20 chapters)
1
Section 1: PyTorch Overview
4
Section 2: Working with Advanced Neural Network Architectures
8
Section 3: Generative Models and Deep Reinforcement Learning
13
Section 4: PyTorch in Production Systems

Building a neural network with CNNs and LSTMs

A CNN-LSTM network architecture consists of a convolutional layer(s) for extracting features from the input data (image), followed by an LSTM layer(s) to perform sequential predictions. This kind of model is both spatially and temporally deep. The convolutional part of the model is often used as an encoder that takes in an input image and outputs high-dimensional features or embeddings.

In practice, the CNN used for these hybrid networks is often pre-trained on, say, an image classification task. The last hidden layer of the pre-trained CNN model is then used as an input to the LSTM component, which is used as a decoder to generate text.

When we are dealing with textual data, we need to transform the words and other symbols (punctuation, identifiers, and more) – together referred to as tokens – into numbers. We do so by representing each token in the text with a unique corresponding number. In the following sub-section...