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Oversmoothing, Oversquashing, Heterophily, Long-Range, and more: Demystifying Common Beliefs in Graph Machine Learning

Debates on oversmoothing, oversquashing, homophily/heterophily, and long-range tasks are muddled within each topic (e.g., oversquashing actually covers two distinct issues) so the paper urges the community to tease apart and precisely define these sub-problems.