Java CostMatrix.FILE_EXTENSION属性代码示例

/**
 * @return tip text for this property suitable for
 * displaying in the explorer/experimenter gui
 */
public String costMatrixSourceTipText() {

  return "Sets where to get the cost matrix. The two options are"
    + "to use the supplied explicit cost matrix (the setting of the "
    + "costMatrix property), or to load a cost matrix from a file when "
    + "required (this file will be loaded from the directory set by the "
    + "onDemandDirectory property and will be named relation_name" 
    + CostMatrix.FILE_EXTENSION + ").";
}
 

/**
 * Prompts the user to save a matrix, and attemps to save it.
 * 
 */
private void saveMatrix() {

  int returnVal = m_fileChooser.showSaveDialog(this);
  if (returnVal == JFileChooser.APPROVE_OPTION) {
    File selectedFile = m_fileChooser.getSelectedFile();

    // append extension if not already present
    if (!selectedFile.getName().toLowerCase()
      .endsWith(CostMatrix.FILE_EXTENSION)) {
      selectedFile = new File(selectedFile.getParent(),
        selectedFile.getName() + CostMatrix.FILE_EXTENSION);
    }

    Writer writer = null;
    try {
      writer = new BufferedWriter(new FileWriter(selectedFile));
      m_matrix.write(writer);
      writer.close();
    } catch (Exception ex) {
      JOptionPane.showMessageDialog(this, "Error writing file '"
        + selectedFile.getName() + "':\n" + ex.getMessage(), "Save failed",
        JOptionPane.ERROR_MESSAGE);
      System.out.println(ex.getMessage());
    }
  }
}
 

/**
    * Prompts the user to save a matrix, and attemps to save it.
    *
    */
   private void saveMatrix() {
     
     int returnVal = m_fileChooser.showSaveDialog(this);
     if(returnVal == JFileChooser.APPROVE_OPTION) {
File selectedFile = m_fileChooser.getSelectedFile();

// append extension if not already present
if (!selectedFile.getName().toLowerCase()
           .endsWith(CostMatrix.FILE_EXTENSION)) {
  selectedFile = new File(selectedFile.getParent(), 
			  selectedFile.getName() 
			  + CostMatrix.FILE_EXTENSION);
}

Writer writer = null;
try {
  writer = new BufferedWriter(new FileWriter(selectedFile));
  m_matrix.write(writer);
  writer.close();
} catch (Exception ex) {
  JOptionPane.showMessageDialog(this, 
				"Error writing file '"
				+ selectedFile.getName()
				+ "':\n" + ex.getMessage(),
				"Save failed",
				JOptionPane.ERROR_MESSAGE);
  System.out.println(ex.getMessage());
}
     }
   }
 

/**
    * Prompts the user to save a matrix, and attemps to save it.
    *
    */
   private void saveMatrix() {
     
     int returnVal = m_fileChooser.showSaveDialog(this);
     if(returnVal == JFileChooser.APPROVE_OPTION) {
File selectedFile = m_fileChooser.getSelectedFile();

// append extension if not already present
if (!selectedFile.getName().toLowerCase()
           .endsWith(CostMatrix.FILE_EXTENSION)) {
  selectedFile = new File(selectedFile.getParent(), 
			  selectedFile.getName() 
			  + CostMatrix.FILE_EXTENSION);
}

Writer writer = null;
try {
  writer = new BufferedWriter(new FileWriter(selectedFile));
  m_matrix.write(writer);
  writer.close();
} catch (Exception ex) {
  JOptionPane.showMessageDialog(this, 
		  Messages.getInstance().getString("CostMatrixEditor_SaveMatrix_JOptionPaneShowMessageDialog_Text_First")
				+ selectedFile.getName()
				+ Messages.getInstance().getString("CostMatrixEditor_SaveMatrix_JOptionPaneShowMessageDialog_Text_Second") + ex.getMessage(),
				Messages.getInstance().getString("CostMatrixEditor_SaveMatrix_JOptionPaneShowMessageDialog_Text_Third"),
				JOptionPane.ERROR_MESSAGE);
  System.out.println(Thread.currentThread().getStackTrace()[1].getClassName() +ex.getMessage());
}
     }
   }
 

/**
 * Builds the model of the base learner.
 *
 * @param data the training data
 * @throws Exception if the classifier could not be built successfully
 */
public void buildClassifier(Instances data) throws Exception {

  // can classifier handle the data?
  getCapabilities().testWithFail(data);

  // remove instances with missing class
  data = new Instances(data);
  data.deleteWithMissingClass();
  
  if (m_MatrixSource == MATRIX_ON_DEMAND) {
    String costName = data.relationName() + CostMatrix.FILE_EXTENSION;
    File costFile = new File(getOnDemandDirectory(), costName);
    if (!costFile.exists()) {
      throw new Exception("On-demand cost file doesn't exist: " + costFile);
    }
    setCostMatrix(new CostMatrix(new BufferedReader(
                                 new FileReader(costFile))));
  }

  // Set up the bagger
  Bagging bagger = new Bagging();
  bagger.setClassifier(getClassifier());
  bagger.setSeed(getSeed());
  bagger.setNumIterations(getNumIterations());
  bagger.setBagSizePercent(getBagSizePercent());
  bagger.buildClassifier(data);
  
  // Use the bagger to reassign class values according to minimum expected
  // cost
  Instances newData = new Instances(data);
  for (int i = 0; i < newData.numInstances(); i++) {
    Instance current = newData.instance(i);
    double [] pred = bagger.distributionForInstance(current);
    int minCostPred = Utils.minIndex(m_CostMatrix.expectedCosts(pred));
    current.setClassValue(minCostPred);
  }

  // Build a classifier using the reassigned data
  m_Classifier.buildClassifier(newData);
}