private static void backPropogationDemo() {
    try {
      System.out.println(Util.ntimes("*", 100));
      System.out.println(
          "\n BackpropagationDemo  - Running BackProp on Iris data Set with 10 epochs of learning ");
      System.out.println(Util.ntimes("*", 100));

      DataSet irisDataSet = DataSetFactory.getIrisDataSet();
      Numerizer numerizer = new IrisDataSetNumerizer();
      NNDataSet innds = new IrisNNDataSet();

      innds.createExamplesFromDataSet(irisDataSet, numerizer);

      NNConfig config = new NNConfig();
      config.setConfig(FeedForwardNeuralNetwork.NUMBER_OF_INPUTS, 4);
      config.setConfig(FeedForwardNeuralNetwork.NUMBER_OF_OUTPUTS, 3);
      config.setConfig(FeedForwardNeuralNetwork.NUMBER_OF_HIDDEN_NEURONS, 6);
      config.setConfig(FeedForwardNeuralNetwork.LOWER_LIMIT_WEIGHTS, -2.0);
      config.setConfig(FeedForwardNeuralNetwork.UPPER_LIMIT_WEIGHTS, 2.0);

      FeedForwardNeuralNetwork ffnn = new FeedForwardNeuralNetwork(config);
      ffnn.setTrainingScheme(new BackPropLearning(0.1, 0.9));

      ffnn.trainOn(innds, 10);

      innds.refreshDataset();
      int[] result = ffnn.testOnDataSet(innds);
      System.out.println(result[0] + " right, " + result[1] + " wrong");
    } catch (Exception e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
  }
  private static void perceptronDemo() {
    try {
      System.out.println(Util.ntimes("*", 100));
      System.out.println(
          "\n Perceptron Demo - Running Perceptron on Iris data Set with 10 epochs of learning ");
      System.out.println(Util.ntimes("*", 100));
      DataSet irisDataSet = DataSetFactory.getIrisDataSet();
      Numerizer numerizer = new IrisDataSetNumerizer();
      NNDataSet innds = new IrisNNDataSet();

      innds.createExamplesFromDataSet(irisDataSet, numerizer);

      Perceptron perc = new Perceptron(3, 4);

      perc.trainOn(innds, 10);

      innds.refreshDataset();
      int[] result = perc.testOnDataSet(innds);
      System.out.println(result[0] + " right, " + result[1] + " wrong");
    } catch (Exception e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
  }