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

Running a pre-trained VGG model

We have already discussed LeNet and AlexNet, two of the foundational CNN architectures. As we progress in the chapter, we will explore increasingly complex CNN models. Although, the key principles in building these model architectures will be the same. We will see a modular model-building approach in putting together convolutional layers, pooling layers, and fully connected layers into blocks/modules and then stacking these blocks sequentially or in a branched manner. In this section, we look at the successor to AlexNet – VGGNet.

The name VGG is derived from the Visual Geometry Group of Oxford University, where this model was invented. Compared to the 8 layers and 60 million parameters of AlexNet, VGG consists of 13 layers (10 convolutional layers and 3 fully connected layers) and 138 million parameters. VGG basically stacks more layers onto the AlexNet architecture with smaller size convolution kernels (2x2 or 3x3). Hence, VGG's novelty...