Venn diagrams of shared highly contributing genes among different machine learning models in each classification. A: nonfailure controls (NF) vs. dilated cardiomyopathy (DCM), B: NF vs. ischemic cardiomyopathy (ICM), C: DCM vs. ICM. DT, decision tree; ENet, elastic net; pcaNNet, neural networks with principal component analysis; RF, random forest; svmRadial, support vector machine with radial kernel.