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

Learning from Heterogeneous Graphs

In the previous chapter, we tried to generate realistic molecules that contain different types of nodes (atoms) and edges (bonds). We also observe this kind of behavior in other applications, such as recommender systems (users and items), social networks (followers and followees), or cybersecurity (routers and servers). We call these kinds of graphs heterogeneous, as opposed to homogeneous graphs, which only involve one type of node and one type of edge.

In this chapter, we will recap everything we know about homogeneous GNNs. We will introduce the message passing neural network framework to generalize the architectures we have seen so far. This summary will allow us to understand how to expand our framework to heterogeneous networks. We will start by creating our own heterogeneous dataset. Then, we will transform homogeneous architectures into heterogeneous ones.

In the last section, we will take a different approach and discuss an architecture...