Coloring Graph Neural Networks for Node Disambiguation

Published in International Joint Conference on Artificial Intelligence (IJCAI), 2020.

In this paper, we show that a simple coloring scheme can improve, both theoretically and empirically, the expressive power of Message Passing Neural Networks(MPNNs). More specifically, we introduce a graph neural network called Colored Local Iterative Procedure (CLIP) that uses colors to disambiguate identical node attributes, and show that this representation is a universal approximator of continuous functions on graphs with node attributes. Our method relies on separability , a key topological characteristic that allows to extend well-chosen neural networks into universal representations. Finally, we show experimentally that CLIP is capable of capturing structural characteristics that traditional MPNNs fail to distinguish,while being state-of-the-art on benchmark graph classification datasets.

Direct Link

Paper URL: https://www.ijcai.org/Proceedings/2020/0294.pdf
Conference Proceedings: https://www.ijcai.org/proceedings/2020/294