ResearchBenchmarksDistribution-on-distribution regression over graphs on Barabasi-Albert m=25 Simulated (test)Follow8.452-Wasserstein DistanceO(d)-GSNN8.38328.83419.2859.7359May 20, 2026Evaluation ResultsMethodMethodLinks2-Wasserstein DistanceO(d)-GSNNRestriction map=O(d)Restriction map=O(d)2026.058.45Gen-GSNNRestriction map=GeneralRestriction map=General2026.058.48Diag-GSNNRestriction map=DiagonalRestriction map=Diagonal2026.058.66Gen-NSDRestriction map=GeneralRestriction map=General2026.059.63Diag-NSDRestriction map=DiagonalRestriction map=Diagonal2026.059.86O(d)-NSDRestriction map=O(d)Restriction map=O(d)2026.059.91MLP2026.0510.04GCN2026.0510.12