public static void printStat(Classifier cl1, Classifier cl2, double cnt1, double cnt2, double p) {
   System.out.println(
       cl1.toString()
           + " ------- "
           + cl2.toString()
           + "\n"
           + "Accuracy :"
           + cl1.getAccuracy()
           + " ------- "
           + cl2.getAccuracy()
           + "\n"
           + "# correct: "
           + cnt1
           + " ------- "
           + cnt2
           + "\n"
           + "p <= "
           + p);
 }