Traffic Flow Forecasting for Road Tunnel Using PSO-GPR Algorithm with Combined Kernel Function

Table 9

Predicted performance evaluation of different kernel function.

Indices	GPR-SE	GPR-RQ	GPR-CK
MAE	18.36	19.09	13.91
MRE	3.37%	3.52%	1.87%
RMSE	3.88	4.08	2.41
Number; (RE ≥ 3%)	5	5	3