Table 13: Comparison of AUROC (top) and Rec@K (bottom) of each model with optimal hyperparameters through random search. The Results for AUPRC is in Table 4. Ave. signifies the average score across the first 9 datasets without T-Social. OOT (out-of-time) means the model could not complete random search within a day. Best results are highlighted in bold.
AUROC	Reddit	Weibo	Amazon	Yelp.	T-Fin.	Ellip.	Tolo.	Quest.	DGraph.	T-Social	Ave.
MLP	60.71	92.89	96.94	81.64	92.24	88.32	73.78	60.15	72.34	73.06	79.89
KNN	62.53	93.57	94.91	84.60	92.69	88.03	72.09	64.00	58.50	77.64	78.99
SVM	68.18	92.52	95.80	77.21	92.59	85.02	72.59	64.77	72.03	OOT	80.08
RF	60.79	98.77	97.53	93.80	94.85	91.68	74.14	54.85	70.37	79.94	81.87
XGBoost	64.59	98.82	98.34	95.38	95.42	89.91	74.84	62.09	72.43	81.75	83.53
XGBOD	68.39	99.24	98.20	93.96	95.39	92.26	74.55	67.53	64.88	OOT	83.82
NA	63.86	99.03	98.23	94.70	94.85	91.27	74.87	66.20	71.73	81.95	83.86
GCN	62.04	98.84	85.17	58.62	94.62	81.69	73.80	68.20	75.51	96.63	77.61
SGC	66.95	98.58	87.84	57.66	87.97	79.52	72.36	68.11	68.63	83.67	76.40
GIN	61.82	98.65	95.63	73.77	92.71	83.01	74.57	68.08	74.16	94.09	80.27
GraphSAGE	63.28	97.75	90.90	82.90	95.62	87.59	80.92	73.04	75.60	95.73	83.07
GAT	64.15	98.54	97.13	79.14	95.75	86.28	78.75	68.30	75.53	90.33	82.62
GT	67.39	97.23	93.37	80.32	94.39	86.10	78.94	69.62	75.71	90.79	82.56
PNA	63.45	98.78	82.14	74.39	92.47	84.86	75.17	66.32	73.39	84.02	79.00
BGNN	68.94	98.59	90.64	63.28	96.20	87.69	76.65	68.02	76.22	99.94	80.69
KNNGCN	60.31	99.17	90.69	69.13	94.69	88.53	74.23	66.95	75.72	87.80	79.94
GAS	60.57	99.11	92.69	76.43	96.45	86.66	78.19	68.15	75.98	94.96	81.58
DCI	66.87	97.94	95.39	78.38	87.85	85.73	73.86	64.77	73.94	83.96	80.53
PCGNN	65.41	95.14	98.01	80.82	94.03	86.50	76.63	67.66	72.76	96.91	81.88
GATSep	66.17	98.22	95.11	80.49	94.40	85.94	79.52	70.08	75.78	87.69	82.85
BernNet	69.83	98.00	95.79	83.54	96.67	87.54	77.51	68.58	73.58	93.73	83.45
AMNet	69.60	98.32	96.92	81.90	96.38	83.66	75.16	66.05	72.99	92.50	82.33
BWGNN	70.82	98.13	98.27	87.13	96.93	87.03	80.41	70.87	76.30	96.88	85.10
GHRN	61.02	99.18	98.29	84.60	96.46	89.50	80.08	72.16	76.13	97.12	84.16
RFGraph	65.35	99.43	96.73	95.24	97.28	93.21	81.88	64.77	67.78	99.69	84.63
XGBGraph	64.74	99.29	98.74	97.37	97.15	91.78	82.85	71.02	75.83	99.76	86.53
Rec@K	Reddit	Weibo	Amazon	Yelp.	T-Fin.	Ellip.	Tolo.	Quest.	DGraph.	T-Social	Ave.
MLP	9.52	78.39	83.15	46.62	68.93	57.43	39.88	16.99	4.04	16.86	44.99
KNN	10.20	73.20	79.35	51.92	70.04	56.60	37.85	19.18	1.98	44.08	44.48
SVM	8.84	77.81	82.07	41.77	72.40	19.21	39.72	18.08	4.04	OOT	40.44
RF	5.44	84.15	86.41	70.23	75.59	72.76	39.72	17.81	4.21	45.48	50.70
XGBoost	6.80	87.03	86.41	75.08	76.01	72.58	41.90	16.71	4.30	21.86	51.87
XGBOD	10.20	87.32	86.96	71.62	75.87	69.07	42.21	16.71	1.68	OOT	51.29
NA	8.84	85.59	87.50	73.38	75.31	71.74	42.21	18.36	4.04	21.70	51.89
GCN	6.12	88.47	44.02	23.85	74.90	33.52	39.41	17.81	7.05	73.23	37.24
SGC	8.84	87.32	46.20	22.46	67.41	22.99	39.72	16.99	3.87	24.93	35.09
GIN	10.88	89.63	80.98	36.15	73.37	32.13	39.41	18.36	6.32	64.47	43.03
GraphSAGE	7.48	90.78	78.26	47.15	78.09	56.69	48.75	21.37	6.84	73.74	48.38
GAT	10.88	89.63	82.61	44.23	79.75	37.86	44.24	17.26	7.14	42.07	45.95
GT	12.93	85.88	78.80	44.62	81.55	30.75	44.39	20.27	6.92	43.58	45.12
PNA	10.88	39.67	90.78	30.00	72.54	36.47	42.68	13.15	5.16	26.95	37.93
BGNN	9.52	93.37	64.67	30.77	77.25	59.56	45.33	12.60	7.70	96.89	44.53
KNNGCN	5.44	89.63	71.74	33.23	75.87	41.55	40.34	18.08	7.18	48.67	42.56
GAS	4.08	91.93	80.43	38.00	79.75	37.49	47.04	18.90	6.02	64.58	44.85
DCI	8.16	89.05	80.98	40.46	71.98	35.27	37.85	17.26	5.85	18.27	42.99
PCGNN	14.97	84.15	85.33	43.77	79.06	43.77	43.15	18.08	6.66	73.53	46.55
GATSep	9.52	88.18	80.98	44.23	81.55	30.56	47.20	21.37	7.31	40.84	45.66
BernNet	10.88	89.34	82.61	49.69	83.63	49.77	44.70	19.73	5.55	48.23	48.43
AMNet	11.56	88.76	83.15	45.38	84.05	30.56	42.52	17.53	4.21	43.21	45.31
BWGNN	11.56	87.90	85.87	56.69	84.19	42.47	50.31	21.64	7.57	75.78	49.80
GHRN	5.44	89.34	85.33	51.85	81.97	50.51	46.57	22.19	6.96	82.33	48.91
RFGraph	3.40	91.93	83.15	75.31	84.05	72.58	52.18	15.89	3.22	93.58	53.52
XGBGraph	6.12	91.93	85.87	83.15	85.02	71.93	53.43	20.55	6.96	93.53	56.11