Table 11: Comparison of AUPRC (top), AUROC (middle), and Rec@K (bottom) for each model employing default hyperparameters in the semi-supervised setting. Each model is executed 10 times with varying random seeds, and the mean scores along with standard deviations are reported. Ave. denotes the average score across all 10 datasets.
AUPRC	Reddit	Weibo	Amazon	Yelp.	T-Fin.	Ellip.	Tolo.	Quest.	DGraph.	T-Social	Mean
MLP	4.4±0.8	56.2±6.0	83.0±1.6	23.6±2.3	53.4±13.9	45.0±5.9	33.3±2.1	7.7±1.5	2.3±0.2	3.9±0.8	31.3
KNN	4.0±0.4	41.1±7.2	76.2±1.2	19.3±1.7	49.1±6.5	25.1±3.7	28.3±1.4	4.7±1.1	1.7±0.1	3.8±0.4	25.3
SVM	4.7±0.5	44.1±10.0	62.2±21.5	25.6±2.0	20.6±10.8	26.5±4.2	33.6±1.6	7.1±1.6	1.9±0.3	3.6±0.6	23.0
RF	4.3±0.4	61.6±10.0	81.9±4.2	27.4±3.5	74.9±1.5	85.0±1.9	33.1±2.3	11.3±3.6	2.1±0.2	7.0±1.3	38.9
XGBoost	4.1±0.4	62.1±7.6	84.0±1.8	26.4±4.2	70.9±5.0	79.5±2.3	31.0±1.9	9.1±3.4	2.0±0.2	6.1±1.3	37.5
XGBOD	4.3±0.6	64.8±6.6	85.0±3.2	26.8±3.8	70.3±4.4	78.4±1.7	30.9±2.4	9.0±3.2	2.0±0.2	4.8±1.0	37.6
NA	4.1±0.4	69.3±4.4	85.6±1.6	27.3±3.8	73.9±1.5	79.2±3.3	31.2±2.0	10.1±3.5	2.1±0.1	6.4±1.3	38.9
GCN	4.2±0.8	86.0±6.7	32.8±1.2	16.4±2.6	60.5±10.8	43.1±4.6	33.0±3.6	6.1±0.9	2.3±0.2	8.4±3.8	29.3
SGC	3.8±0.7	63.9±7.4	29.5±2.6	16.1±1.9	31.3±18.6	24.2±2.1	32.2±3.7	6.1±0.7	1.7±0.2	4.7±1.1	21.4
GIN	4.3±0.6	67.6±7.4	75.4±4.3	23.7±5.4	44.8±7.1	40.1±3.2	31.8±3.2	6.7±1.1	2.0±0.1	6.2±1.7	30.3
GraphSAGE	4.5±0.6	58.5±6.2	42.5±6.1	20.9±3.5	11.7±5.2	43.1±5.6	34.0±2.1	5.5±1.3	2.0±0.2	7.8±1.3	23.0
GAT	4.7±0.7	73.3±7.3	81.6±1.7	25.0±2.9	28.9±8.6	44.2±6.6	33.0±2.0	7.3±1.2	2.2±0.2	9.2±2.0	30.9
GT	4.3±0.7	78.2±4.7	71.6±5.5	23.7±3.0	17.2±10.9	46.4±8.0	34.5±2.0	7.2±1.6	2.2±0.3	8.6±1.5	29.4
PNA	4.0±0.5	83.4±4.0	34.6±3.8	16.8±2.7	27.4±9.7	31.3±2.9	32.6±2.3	5.7±1.2	1.8±0.2	22.8±5.5	26.0
BGNN	4.7±0.5	81.8±6.3	39.0±5.9	17.6±1.3	75.8±2.2	35.3±5.3	33.1±3.6	5.7±0.7	2.0±0.2	58.2±14.6	35.3
GAS	4.7±0.7	65.7±8.4	80.7±1.7	21.7±3.3	45.7±13.4	46.0±4.9	31.7±3.0	6.3±2.0	2.5±0.2	8.6±2.4	31.4
DCI	4.3±0.4	76.2±4.3	72.5±7.9	24.0±4.8	51.0±7.2	43.4±4.9	32.1±4.2	6.1±1.3	2.0±0.2	7.4±2.5	31.9
PCGNN	3.4±0.5	69.3±9.7	81.9±1.9	25.0±3.5	58.1±11.3	40.3±6.6	33.9±1.7	6.4±1.8	2.4±0.4	8.0±1.6	32.9
GAT-sep	4.6±0.7	76.5±5.8	80.9±2.6	24.4±3.7	34.2±10.1	46.8±8.1	33.6±2.2	7.4±1.3	2.4±0.3	10.4±1.9	32.1
BernNet	4.9±0.3	66.6±5.5	81.2±2.4	23.9±2.7	51.8±12.4	40.0±4.1	28.9±3.5	6.7±2.1	2.5±0.2	4.2±1.2	31.1
AMNet	4.9±0.4	67.1±5.1	82.4±2.2	23.9±3.5	60.2±8.2	33.3±4.8	28.6±1.5	7.4±1.4	2.2±0.3	3.1±0.3	31.3
BWGNN	4.2±0.7	80.6±4.7	81.7±2.2	23.7±2.9	60.9±13.8	43.4±5.5	35.3±2.2	6.5±1.7	2.1±0.3	15.9±6.2	35.4
GHRN	4.2±0.6	77.0±6.2	80.7±1.7	23.8±2.8	63.4±10.4	44.2±5.7	35.9±2.0	6.5±1.7	2.3±0.3	16.2±4.6	35.4
RF-Graph	4.5±0.4	73.8±9.5	70.7±5.1	23.6±2.5	81.1±2.7	80.8±3.1	35.8±2.4	10.1±2.8	2.0±0.2	51.3±6.2	43.4
XGB-Graph	4.1±0.5	75.9±6.2	84.4±1.1	24.8±3.1	78.3±3.1	77.2±3.2	34.1±2.8	7.7±2.1	1.9±0.2	40.6±7.6	42.9
AUROC	Reddit	Weibo	Amazon	Yelp.	T-Fin.	Ellip.	Tolo.	Quest.	DGraph.	T-Social	Ave.
MLP	59.1±4.3	66.6±7.8	92.2±2.3	64.7±3.2	89.9±1.4	89.4±1.4	68.1±2.5	61.2±3.1	69.1±1.2	59.1±5.2	71.9
KNN	58.9±2.3	72.5±3.3	89.5±0.9	60.3±3.3	87.7±0.9	78.6±4.7	63.0±1.9	58.6±2.3	59.8±2.4	56.9±2.8	68.6
SVM	61.8±2.4	69.6±4.2	89.4±4.7	65.8±3.0	83.4±9.9	83.0±3.7	68.9±1.1	62.0±2.9	65.2±3.1	57.6±5.4	70.7
RF	61.0±2.6	94.1±1.3	94.9±0.8	68.0±3.8	93.0±0.9	94.4±1.9	66.5±2.1	61.5±4.0	63.3±4.5	67.3±3.6	76.4
XGBoost	58.9±2.5	93.8±0.8	94.2±1.0	67.0±5.1	92.4±1.1	91.6±1.9	65.1±1.3	59.5±5.5	66.1±2.2	61.0±4.6	75.4
XGBOD	59.1±3.1	94.3±0.5	95.2±0.8	66.8±5.2	92.5±1.0	91.6±1.7	64.1±2.3	60.6±3.9	64.2±2.1	61.0±4.6	74.9
NA	59.5±2.3	93.7±0.6	94.9±1.3	69.3±3.6	92.0±1.2	90.9±2.3	65.4±1.2	59.7±5.6	66.8±1.4	64.9±3.1	75.7
GCN	56.9±5.9	93.5±6.6	82.0±0.3	51.2±3.7	88.3±2.5	86.2±1.9	64.2±4.8	60.0±2.2	66.2±2.5	71.6±10.4	72.0
SGC	53.6±5.2	81.1±6.5	80.2±1.5	51.1±2.9	74.5±12.3	80.6±1.2	63.6±5.1	63.6±5.0	59.5±3.3	64.8±5.6	67.3
GIN	60.0±4.1	83.8±8.3	91.6±1.7	62.9±7.3	84.5±4.5	88.2±0.9	66.8±5.2	62.2±2.2	65.7±1.8	70.4±7.4	73.6
GraphSAGE	60.3±3.8	81.8±6.5	81.4±2.0	58.9±4.3	68.9±5.5	87.4±1.0	67.6±4.2	61.2±2.9	64.8±3.3	72.0±2.9	70.4
GAT	60.5±3.9	86.4±7.7	92.4±1.9	65.6±4.0	85.0±4.5	88.5±2.1	68.1±3.0	62.3±1.4	67.2±1.9	75.4±4.8	75.1
GT	59.1±4.4	94.4±4.6	88.6±2.2	64.5±4.3	73.5±7.2	88.9±1.6	69.7±2.5	60.7±3.6	67.7±2.5	71.4±2.1	73.9
PNA	58.4±4.4	93.2±1.8	79.1±2.9	53.2±5.5	78.4±9.7	83.7±1.1	65.7±3.1	62.1±2.9	60.7±3.9	84.4±3.5	71.9
BGNN	63.1±3.3	94.4±5.3	83.7±2.5	54.4±1.2	93.7±0.7	83.3±2.3	65.1±4.1	59.8±3.1	59.9±3.5	93.6±1.4	75.1
GAS	60.6±3.0	81.8±7.0	91.6±1.9	61.1±5.2	88.7±1.1	89.0±1.4	62.7±2.8	57.5±4.4	69.9±2.0	72.1±8.8	73.5
DCI	61.0±3.1	89.3±5.3	89.4±3.0	64.1±5.3	88.0±3.2	88.5±1.3	67.6±7.1	62.2±2.5	65.3±2.3	74.2±3.3	75.0
PCGNN	52.8±3.4	83.9±8.1	93.2±1.2	65.1±4.8	92.0±1.1	87.5±1.4	67.4±2.1	59.0±4.0	68.4±2.2	69.1±2.4	73.8
GAT-sep	60.3±4.4	87.8±5.7	91.4±2.4	65.0±4.5	86.3±3.9	89.3±2.1	69.1±2.5	61.9±4.2	69.0±1.9	74.5±3.7	75.5
BernNet	63.1±1.7	80.1±6.9	92.1±2.4	65.0±3.7	91.2±1.0	87.0±1.7	61.9±5.6	61.8±6.4	69.0±1.4	59.8±6.3	73.1
AMNet	62.9±1.8	82.4±4.6	92.8±2.1	64.8±5.2	92.6±0.9	85.4±1.7	61.7±4.1	63.6±2.8	67.1±3.2	53.7±3.4	72.7
BWGNN	57.7±5.0	93.6±4.0	91.8±2.3	64.3±3.4	92.1±2.7	88.7±1.3	68.5±2.7	60.2±8.6	65.5±3.1	77.5±4.3	76.0
GHRN	57.5±4.5	91.6±4.4	90.9±1.9	64.5±3.1	92.6±0.7	89.0±1.3	69.0±2.2	60.5±8.7	67.1±3.0	78.7±3.0	76.1
RF-Graph	61.4±2.4	96.3±1.1	92.5±1.3	61.6±2.7	95.0±0.7	93.9±2.1	70.4±2.3	64.7±3.6	64.9±3.2	88.6±1.6	78.9
XGB-Graph	59.2±2.7	96.4±0.7	94.7±0.9	64.0±3.5	94.8±0.6	91.9±1.3	67.5±3.4	61.4±2.9	62.4±4.1	85.2±1.8	77.8
Rec@K	Reddit	Weibo	Amazon	Yelp.	T-Fin.	Ellip.	Tolo.	Quest.	DGraph	T-Social
MLP	6.5±2.0	53.2±5.2	79.3±1.0	26.5±2.7	59.9±10.2	54.5±6.2	35.5±2.6	12.0±2.1	3.4±0.9	3.2±2.1	33.4
KNN	5.7±1.6	46.4±7.8	75.1±2.0	12.0±3.1	57.9±4.4	31.8±5.4	31.4±2.1	8.3±3.4	2.2±0.7	5.7±2.2	27.6
SVM	6.4±2.2	48.0±5.5	61.8±21.4	28.5±2.6	18.1±18.0	26.6±7.0	36.1±1.6	11.2±3.0	1.6±0.5	1.6±0.4	24.0
RF	5.6±1.9	56.4±6.9	73.1±7.8	30.5±3.8	69.3±1.0	77.0±2.6	34.9±2.5	12.9±3.9	2.8±0.6	11.5±2.1	37.4
XGBoost	5.0±1.9	56.8±4.5	77.5±2.9	29.5±5.0	66.9±2.7	72.1±2.5	33.1±2.8	11.5±3.3	1.8±0.9	9.2±3.3	36.3
XGBOD	4.9±1.7	78.7±4.1	40.4±3.1	17.5±4.5	38.6±14.4	38.6±3.6	34.0±2.2	8.4±2.2	2.2±0.7	29.4±9.3	29.2
NA	4.6±1.9	61.8±2.5	79.2±4.2	17.5±1.4	72.9±1.9	43.4±6.3	34.7±2.7	9.0±1.5	3.6±0.6	10.6±2.3	36.8
GCN	6.2±2.2	79.2±4.3	36.9±2.6	16.9±3.0	60.6±7.6	49.7±4.2	33.4±3.5	9.8±1.2	3.6±0.4	10.2±8.1	30.6
SGC	5.9±2.9	64.1±7.6	33.6±2.3	16.4±2.2	35.8±19.4	26.9±4.4	32.7±3.2	10.0±1.4	2.4±0.8	4.0±1.7	23.2
GIN	4.8±1.9	66.5±7.3	70.4±5.7	26.5±6.1	54.4±5.0	47.6±3.1	33.6±3.0	10.3±1.1	2.1±0.5	5.3±2.9	32.2
GraphSAGE	5.8±0.8	63.4±6.0	48.0±5.6	22.9±3.6	18.5±9.4	48.2±5.8	35.2±2.2	8.8±2.5	2.5±0.7	9.5±2.9	26.3
GAT-sep	6.5±2.3	71.4±4.9	77.5±2.5	27.2±4.2	36.6±11.7	43.9±5.9	35.2±2.0	11.2±1.9	3.4±0.9	14.9±2.9	34
BernNet	6.5±2.3	70.2±4.6	77.1±1.7	28.1±3.4	36.2±10.3	51.4±5.8	35.1±1.8	10.9±0.9	3.1±0.7	11.6±3.0	33.0
GT	5.6±1.7	75.4±3.3	70.2±4.7	26.8±3.4	24.4±15.7	53.1±7.6	36.3±16	10.7±1.6	2.8±0.8	11.6±3.0	31.7
PNA	4.2±1.9	78.7±4.1	40.4±3.1	17.5±4.5	38.6±14.4	49.7±6.1	35.5±3.1	10.9±3.2	3.1±0.8	24.3±7.4	29.2
BGNN	5.6±2.1	79.7±5.3	43.2±6.2	17,5±1,4	72,9±1,9	43,4±6,3	34,7±2,7	9,0±1,5	3,6±0,6	58,2±12,4	36,8