Table 2.

Classification results of fatigue state vs. alert state for the validation set.

Classification metrics	Classification model
	ANN-BP	ANN-PSO	RBF-(ROLS+D-opt)	RBF-TLLH
TP	552	517	576	665
TN	554	452	688	670
FN	168	203	144	55
FP	166	268	32	50
Sensitivity/TPR (%)	76.67%	71.81%	80.00%	92.36%
Specificity/TNR (%)	76.94%	62.78%	95.56%	93.06%
Accuracy (%)	76.81%	67.29%	87.78%	92.71%

True represents the fatigue state; false represents the alert state.

TP, true positive; TN, true negative; FN, false negative; FP, false positive.