Topological based classification using graph convolutional networks
This addresses node classification in graph machine learning, offering a novel approach that improves performance over existing methods, though it is incremental in nature.
The paper tackles the problem of node classification in graphs by proposing that node classes are associated with topological features, and shows that adding an adjacency matrix based on topological similarity between distant nodes to Graph Convolutional Networks (GCNs) significantly improves accuracy, achieving better results than all state-of-the-art methods on multiple datasets.
In colored graphs, node classes are often associated with either their neighbors class or with information not incorporated in the graph associated with each node. We here propose that node classes are also associated with topological features of the nodes. We use this association to improve Graph machine learning in general and specifically, Graph Convolutional Networks (GCN). First, we show that even in the absence of any external information on nodes, a good accuracy can be obtained on the prediction of the node class using either topological features, or using the neighbors class as an input to a GCN. This accuracy is slightly less than the one that can be obtained using content based GCN. Secondly, we show that explicitly adding the topology as an input to the GCN does not improve the accuracy when combined with external information on nodes. However, adding an additional adjacency matrix with edges between distant nodes with similar topology to the GCN does significantly improve its accuracy, leading to results better than all state of the art methods in multiple datasets.