Performance of optimal subset selection with feature selection method CHI2 and the optimal performance for the different species (A) mm10, (B) TAIR10 and (C) sacCer3, respectively. The TOP100 dimensions of features, which are the top 100 highest Chi2 values, correspond to feature dimensions. The weight of each feature was selected for among the total selected dimensions is presented. The bar chart shows the criteria for the original incorporated features (before feature selection) and the selected features.