Table 1.

Performance of the AO-MPKELM models under different highest mixing orders.

D	RMSE		MAE		Time (s)
	Training	Testing	Training	Testing
2	4.78 × 10−3	4.08 × 10−3	3.62 × 10−3	3.16 × 10−3	0.68
3	4.87 × 10−4	4.63 × 10−4	3.98 × 10−4	3.48 × 10−4	0.78
4	8.76 × 10−5	1.66 × 10−4	6.26 × 10−5	1.23 × 10−4	0.97
5	6.54 × 10−5	1.80 × 10−4	4.81 × 10−5	1.34 × 10−4	1.16