Useful for feature selection. The feature group is specified via extra.arg.
    The names of the features within the group must contain that string. Make sure names of
    features of other groups do not contain this string.

Amount of features of feature group 'cnv' used for the model

Amount of features of feature group 'mirna' used for the model

Amount of features of feature group 'mutation' used for the model

Amount of features of feature group 'rna' used for the model