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

Summary

In this chapter, we applied the concept of generative machine learning to images by generating an image that contains the content of one image and the style of another – a task known as neural style transfer. First, we understood the idea behind the style transfer algorithm, especially the use of the gram matrix in order to extract styles from an image.

Next, we used PyTorch to build our own neural style transfer model. We used parts of a pre-trained VGG19 model to extract content and style information through some of its convolutional layers. We replaced the max pooling layers of the VGG19 model with average pooling layers for a smooth gradient flow. We then input a random initial image to the style transfer model and with the help of a style and a content loss, we fine-tuned the image pixels using gradient descent.

This input image evolves over epochs and gives us the final generated image, which contains the content of the content image and style of the style...