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

Discussing ResNet and DenseNet architectures

In the previous section, we explored the Inception models, which had a reduced number of model parameters as the number of layers increased, thanks to the 1x1 convolutions and global average pooling. Furthermore, auxiliary classifiers were used to combat the vanishing gradient problem.

ResNet introduced the concept of skip connections. This simple yet effective trick overcomes the problem of both parameter overflow and vanishing gradients. The idea, as shown in the following diagram, is quite simple. The input is first passed through a non-linear transformation (convolutions followed by non-linear activations) and then the output of this transformation (referred to as the residual) is added to the original input. Each block of such computation is called a residual block, hence the name of the model – residual network or ResNet.

Figure 3.26 – Skip connections

Figure 3.26 – Skip connections

Using these skip (or shortcut) connections...