A new 'unbiased homophily' measure satisfies all five previously proposed reliability axioms for undirected graphs, and an impossibility proof shows no such measure exists for directed graphs.
Revisiting heterophily for graph neural networks
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Revisiting Graph Homophily Measures
A new 'unbiased homophily' measure satisfies all five previously proposed reliability axioms for undirected graphs, and an impossibility proof shows no such measure exists for directed graphs.