Table 4.

Results of evaluation indicators for each coupling model.

Model	Evaluation metrics
	$\mathit{MAE}$/MPa	$\mathit{RMSE}$/MPa	$R^2$
IABC-MLP	2.504	3.408	0.973
ABC-MLP	3.053	4.070	0.958
PSO-MLP	3.799	5.070	0.931
TSO-ELM	5.240	6.050	0.870
CS-AdaBoost-CART	3.996	4.987	0.914