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Gaussian smoothing methods for semi-supervised learning. aSINKSOURCE uses negative (red) and positive(blue) node labels. bSINKSOURCE+ uses only positive labels and introduces a single negative (dashed red node) with λ-weighted edges to all unlabeled nodes (dashed edges). cPSEUDO-SINKSOURCE+ combines SINKSOURCE and SINKSOURCE+ with a λ-weighted sink node and negative node labels
