Fig. 4

A LASSO regression process parameter diagram (on the left, the vertical coordinate is the coefficient of variables, and the horizontal coordinate is log (Lambda). With the change of lambda, the coefficient of most variables is finally compressed to 0; the two dotted lines in the right figure indicate two special lambda values). B RFE-SVM model accuracy (left) and error rate (right). Ordinate indicates the (RMSE) Root mean square error. C Venn diagram for the feature genes obtained by LASSO regression algorithm and RFE-SVM algorithm. D ROC curves of four key FRGs. MCC: Matthew’s correlation coefficient