Book Image

Hands-On Graph Neural Networks Using Python

By : Maxime Labonne
Book Image

Hands-On Graph Neural Networks Using Python

By: Maxime Labonne

Overview of this book

Graph neural networks are a highly effective tool for analyzing data that can be represented as a graph, such as networks, chemical compounds, or transportation networks. The past few years have seen an explosion in the use of graph neural networks, with their application ranging from natural language processing and computer vision to recommendation systems and drug discovery. Hands-On Graph Neural Networks Using Python begins with the fundamentals of graph theory and shows you how to create graph datasets from tabular data. As you advance, you’ll explore major graph neural network architectures and learn essential concepts such as graph convolution, self-attention, link prediction, and heterogeneous graphs. Finally, the book proposes applications to solve real-life problems, enabling you to build a professional portfolio. The code is readily available online and can be easily adapted to other datasets and apps. By the end of this book, you’ll have learned to create graph datasets, implement graph neural networks using Python and PyTorch Geometric, and apply them to solve real-world problems, along with building and training graph neural network models for node and graph classification, link prediction, and much more.
Table of Contents (25 chapters)
1
Part 1: Introduction to Graph Learning
5
Part 2: Fundamentals
10
Part 3: Advanced Techniques
18
Part 4: Applications
22
Chapter 18: Unlocking the Potential of Graph Neural Networks for Real-World Applications

Predicting Links with Graph Neural Networks

Link prediction is one of the most popular tasks performed with graphs. It is defined as the problem of predicting the existence of a link between two nodes. This ability is at the core of social networks and recommender systems. A good example is how social media networks display friends and followers you have in common with others. Intuitively, if this number is high, you are more likely to connect with these people. This likelihood is precisely what link prediction tries to estimate.

In this chapter, we will first see how to perform link prediction without any machine learning. These traditional techniques are essential to understanding what GNNs learn. We will then refer to previous chapters about DeepWalk and Node2Vec to link prediction through matrix factorization. Unfortunately, these techniques have significant limitations, which is why we will transition to GNN-based methods.

We will explore three methods from two different...