ResearchBenchmarksDistribution-on-distribution regression over graphs on Watts-Strogatz (k=25, p=0.3) Simulated (test)Follow8.872-Wasserstein DistanceGen-GSNN8.68849.914211.1412.3658May 20, 2026Evaluation ResultsMethodMethodLinks2-Wasserstein DistanceGen-GSNNRestriction map=GeneralRestriction map=General2026.058.87O(d)-NSDRestriction map=O(d)Restriction map=O(d)2026.059.87Diag-NSDRestriction map=DiagonalRestriction map=Diagonal2026.0511.27Gen-NSDRestriction map=GeneralRestriction map=General2026.0511.52Diag-GSNNRestriction map=DiagonalRestriction map=Diagonal2026.0512.22O(d)-GSNNRestriction map=O(d)Restriction map=O(d)2026.0512.29MLP2026.0513.37GCN2026.0513.41