Before learning about graph NNs (GNNs), let's look at why we need graph networks in the first place. We'll start by defining a graph, which is a set of objects (also known as nodes or vertices) where some pairs of objects have connections (or edges) between them.
A graph has the following properties:
- We'll represent the graph as , where V is the set of nodes and E is the set of edges.
- The expression describes an edge between ...