code: public static TreeVotes[] collectVotes(int trees, int nclasses, Frame f, int ncols, float rate, int variable, SpeeDRFModel model, Vec resp) {
      return new VariableImportance(trees, nclasses, ncols, rate, variable, model, f, resp).doAll(f).resultVotes();
    }
docs: VariableImportance(int trees, int nclasses, int ncols, float rate, int variable, SpeeDRFModel model)