Table 1.

The performance of IFOA-LSSVM on the testing set with different combinations of features.

Training Features	CER	RMSE	MAE	MRE (%)	TIC
KF	0.1782	0.3291	0.1754	7.79	0.0669
EF	0.2193	0.4262	0.2014	9.83	0.0939
KF + EF	0.03015	0.0611	0.0524	2.66	0.0089