Fig. 4

AUC curve of CM1 dataset. a, b illustrate the AUC curves of CM1 dataset using the zero threshold based spectral classifier and MAD threshold based spectral classifier, respectively. The AUC is the area under the ROC that is constructed using the true positive rate (TPR) or recall across the false positive rate (FPR), which are computed by Eqs. 18 and 20, respectively