/*
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/*
 *    ClassifierSplitEvaluator.java
 *    Copyright (C) 1999 University of Waikato, Hamilton, New Zealand
 *
 */

package weka.experiment;

import java.io.ByteArrayOutputStream;
import java.io.ObjectOutputStream;
import java.io.ObjectStreamClass;
import java.io.Serializable;
import java.lang.management.ManagementFactory;
import java.lang.management.ThreadMXBean;
import java.util.Enumeration;
import java.util.Vector;

import weka.classifiers.Classifier;
import weka.classifiers.Evaluation;
import weka.classifiers.rules.ZeroR;
import weka.core.AdditionalMeasureProducer;
import weka.core.Attribute;
import weka.core.Instance;
import weka.core.Instances;
import weka.core.Option;
import weka.core.OptionHandler;
import weka.core.RevisionHandler;
import weka.core.RevisionUtils;
import weka.core.Summarizable;
import weka.core.Utils;

/**
 * <!-- globalinfo-start --> A SplitEvaluator that produces results for a
 * classification scheme on a nominal class attribute.
 * <p/>
 * <!-- globalinfo-end -->
 * 
 * <!-- options-start --> Valid options are:
 * <p/>
 * 
 * <pre>
 * -W &lt;class name&gt;
 *  The full class name of the classifier.
 *  eg: weka.classifiers.bayes.NaiveBayes
 * </pre>
 * 
 * <pre>
 * -C &lt;index&gt;
 *  The index of the class for which IR statistics
 *  are to be output. (default 1)
 * </pre>
 * 
 * <pre>
 * -I &lt;index&gt;
 *  The index of an attribute to output in the
 *  results. This attribute should identify an
 *  instance in order to know which instances are
 *  in the test set of a cross validation. if 0
 *  no output (default 0).
 * </pre>
 * 
 * <pre>
 * -P
 *  Add target and prediction columns to the result
 *  for each fold.
 * </pre>
 * 
 * <pre>
 * Options specific to classifier weka.classifiers.rules.ZeroR:
 * </pre>
 * 
 * <pre>
 * -D
 *  If set, classifier is run in debug mode and
 *  may output additional info to the console
 * </pre>
 * 
 * <!-- options-end -->
 * 
 * All options after -- will be passed to the classifier.
 * 
 * @author Len Trigg (trigg@cs.waikato.ac.nz)
 * @version $Revision: 11198 $
 */
public class ClassifierSplitEvaluator
  implements SplitEvaluator, OptionHandler, AdditionalMeasureProducer,
  RevisionHandler {

  /** for serialization */
  static final long serialVersionUID = -8511241602760467265L;

  /** The template classifier */
  protected Classifier m_Template = new ZeroR();

  /** The classifier used for evaluation */
  protected Classifier m_Classifier;

  /** The names of any additional measures to look for in SplitEvaluators */
  protected String[] m_AdditionalMeasures = null;

  /**
   * Array of booleans corresponding to the measures in m_AdditionalMeasures
   * indicating which of the AdditionalMeasures the current classifier can
   * produce
   */
  protected boolean[] m_doesProduce = null;

  /**
   * The number of additional measures that need to be filled in after taking
   * into account column constraints imposed by the final destination for
   * results
   */
  protected int m_numberAdditionalMeasures = 0;

  /** Holds the statistics for the most recent application of the classifier */
  protected String m_result = null;

  /** The classifier options (if any) */
  protected String m_ClassifierOptions = "";

  /** The classifier version */
  protected String m_ClassifierVersion = "";

  /** The length of a key */
  private static final int KEY_SIZE = 3;

  /** The length of a result */
  private static final int RESULT_SIZE = 28;

  /** The number of IR statistics */
  private static final int NUM_IR_STATISTICS = 14;

  /** The number of averaged IR statistics */
  private static final int NUM_WEIGHTED_IR_STATISTICS = 8;

  /** Class index for information retrieval statistics (default 0) */
  private int m_IRclass = 0;

  /** Flag for prediction and target columns output. */
  private boolean m_predTargetColumn = false;

  /** Attribute index of instance identifier (default -1) */
  private int m_attID = -1;

  /**
   * No args constructor.
   */
  public ClassifierSplitEvaluator() {

    updateOptions();
  }

  /**
   * Returns a string describing this split evaluator
   * 
   * @return a description of the split evaluator suitable for displaying in the
   *         explorer/experimenter gui
   */
  public String globalInfo() {
    return " A SplitEvaluator that produces results for a classification "
      + "scheme on a nominal class attribute.";
  }

  /**
   * Returns an enumeration describing the available options..
   * 
   * @return an enumeration of all the available options.
   */
  @Override
  public Enumeration listOptions() {

    Vector newVector = new Vector(4);

    newVector.addElement(new Option(
      "\tThe full class name of the classifier.\n"
        + "\teg: weka.classifiers.bayes.NaiveBayes",
      "W", 1,
      "-W <class name>"));
    newVector.addElement(new Option(
      "\tThe index of the class for which IR statistics\n" +
        "\tare to be output. (default 1)",
      "C", 1,
      "-C <index>"));
    newVector.addElement(new Option(
      "\tThe index of an attribute to output in the\n" +
        "\tresults. This attribute should identify an\n" +
        "\tinstance in order to know which instances are\n" +
        "\tin the test set of a cross validation. if 0\n" +
        "\tno output (default 0).",
      "I", 1,
      "-I <index>"));
    newVector.addElement(new Option(
      "\tAdd target and prediction columns to the result\n" +
        "\tfor each fold.",
      "P", 0,
      "-P"));

    if ((m_Template != null) &&
      (m_Template instanceof OptionHandler)) {
      newVector.addElement(new Option(
        "",
        "", 0, "\nOptions specific to classifier "
          + m_Template.getClass().getName() + ":"));
      Enumeration enu = ((OptionHandler) m_Template).listOptions();
      while (enu.hasMoreElements()) {
        newVector.addElement(enu.nextElement());
      }
    }
    return newVector.elements();
  }

  /**
   * Parses a given list of options.
   * <p/>
   * 
   * <!-- options-start --> Valid options are:
   * <p/>
   * 
   * <pre>
   * -W &lt;class name&gt;
   *  The full class name of the classifier.
   *  eg: weka.classifiers.bayes.NaiveBayes
   * </pre>
   * 
   * <pre>
   * -C &lt;index&gt;
   *  The index of the class for which IR statistics
   *  are to be output. (default 1)
   * </pre>
   * 
   * <pre>
   * -I &lt;index&gt;
   *  The index of an attribute to output in the
   *  results. This attribute should identify an
   *  instance in order to know which instances are
   *  in the test set of a cross validation. if 0
   *  no output (default 0).
   * </pre>
   * 
   * <pre>
   * -P
   *  Add target and prediction columns to the result
   *  for each fold.
   * </pre>
   * 
   * <pre>
   * Options specific to classifier weka.classifiers.rules.ZeroR:
   * </pre>
   * 
   * <pre>
   * -D
   *  If set, classifier is run in debug mode and
   *  may output additional info to the console
   * </pre>
   * 
   * <!-- options-end -->
   * 
   * All options after -- will be passed to the classifier.
   * 
   * @param options the list of options as an array of strings
   * @throws Exception if an option is not supported
   */
  @Override
  public void setOptions(String[] options) throws Exception {

    String cName = Utils.getOption('W', options);
    if (cName.length() > 0) {

      // Do it first without options, so if an exception is thrown during
      // the option setting, listOptions will contain options for the actual
      // Classifier.
      setClassifier(Classifier.forName(cName, null));
    }
    if (getClassifier() instanceof OptionHandler) {
      ((OptionHandler) getClassifier())
        .setOptions(Utils.partitionOptions(options));
      updateOptions();
    }

    String indexName = Utils.getOption('C', options);
    if (indexName.length() != 0) {
      m_IRclass = (new Integer(indexName)).intValue() - 1;
    } else {
      m_IRclass = 0;
    }

    String attID = Utils.getOption('I', options);
    if (attID.length() != 0) {
      m_attID = (new Integer(attID)).intValue() - 1;
    } else {
      m_attID = -1;
    }

    m_predTargetColumn = Utils.getFlag('P', options);
  }

  /**
   * Gets the current settings of the Classifier.
   * 
   * @return an array of strings suitable for passing to setOptions
   */
  @Override
  public String[] getOptions() {

    String[] classifierOptions = new String[0];
    if ((m_Template != null) &&
      (m_Template instanceof OptionHandler)) {
      classifierOptions = ((OptionHandler) m_Template).getOptions();
    }

    String[] options = new String[classifierOptions.length + 8];
    int current = 0;

    if (getClassifier() != null) {
      options[current++] = "-W";
      options[current++] = getClassifier().getClass().getName();
    }
    options[current++] = "-I";
    options[current++] = "" + (m_attID + 1);

    if (getPredTargetColumn()) {
      options[current++] = "-P";
    }

    options[current++] = "-C";
    options[current++] = "" + (m_IRclass + 1);
    options[current++] = "--";

    System.arraycopy(classifierOptions, 0, options, current,
      classifierOptions.length);
    current += classifierOptions.length;
    while (current < options.length) {
      options[current++] = "";
    }
    return options;
  }

  /**
   * Set a list of method names for additional measures to look for in
   * Classifiers. This could contain many measures (of which only a subset may
   * be produceable by the current Classifier) if an experiment is the type that
   * iterates over a set of properties.
   * 
   * @param additionalMeasures a list of method names
   */
  @Override
  public void setAdditionalMeasures(String[] additionalMeasures) {
    // System.err.println("ClassifierSplitEvaluator: setting additional measures");
    m_AdditionalMeasures = additionalMeasures;

    // determine which (if any) of the additional measures this classifier
    // can produce
    if (m_AdditionalMeasures != null && m_AdditionalMeasures.length > 0) {
      m_doesProduce = new boolean[m_AdditionalMeasures.length];

      if (m_Template instanceof AdditionalMeasureProducer) {
        Enumeration en = ((AdditionalMeasureProducer) m_Template).
          enumerateMeasures();
        while (en.hasMoreElements()) {
          String mname = (String) en.nextElement();
          for (int j = 0; j < m_AdditionalMeasures.length; j++) {
            if (mname.compareToIgnoreCase(m_AdditionalMeasures[j]) == 0) {
              m_doesProduce[j] = true;
            }
          }
        }
      }
    } else {
      m_doesProduce = null;
    }
  }

  /**
   * Returns an enumeration of any additional measure names that might be in the
   * classifier
   * 
   * @return an enumeration of the measure names
   */
  @Override
  public Enumeration enumerateMeasures() {
    Vector newVector = new Vector();
    if (m_Template instanceof AdditionalMeasureProducer) {
      Enumeration en = ((AdditionalMeasureProducer) m_Template).
        enumerateMeasures();
      while (en.hasMoreElements()) {
        String mname = (String) en.nextElement();
        newVector.addElement(mname);
      }
    }
    return newVector.elements();
  }

  /**
   * Returns the value of the named measure
   * 
   * @param additionalMeasureName the name of the measure to query for its value
   * @return the value of the named measure
   * @throws IllegalArgumentException if the named measure is not supported
   */
  @Override
  public double getMeasure(String additionalMeasureName) {
    if (m_Template instanceof AdditionalMeasureProducer) {
      if (m_Classifier == null) {
        throw new IllegalArgumentException("ClassifierSplitEvaluator: " +
          "Can't return result for measure, " +
          "classifier has not been built yet.");
      }
      return ((AdditionalMeasureProducer) m_Classifier).
        getMeasure(additionalMeasureName);
    } else {
      throw new IllegalArgumentException("ClassifierSplitEvaluator: "
        + "Can't return value for : " + additionalMeasureName
        + ". " + m_Template.getClass().getName() + " "
        + "is not an AdditionalMeasureProducer");
    }
  }

  /**
   * Gets the data types of each of the key columns produced for a single run.
   * The number of key fields must be constant for a given SplitEvaluator.
   * 
   * @return an array containing objects of the type of each key column. The
   *         objects should be Strings, or Doubles.
   */
  @Override
  public Object[] getKeyTypes() {

    Object[] keyTypes = new Object[KEY_SIZE];
    keyTypes[0] = "";
    keyTypes[1] = "";
    keyTypes[2] = "";
    return keyTypes;
  }

  /**
   * Gets the names of each of the key columns produced for a single run. The
   * number of key fields must be constant for a given SplitEvaluator.
   * 
   * @return an array containing the name of each key column
   */
  @Override
  public String[] getKeyNames() {

    String[] keyNames = new String[KEY_SIZE];
    keyNames[0] = "Scheme";
    keyNames[1] = "Scheme_options";
    keyNames[2] = "Scheme_version_ID";
    return keyNames;
  }

  /**
   * Gets the key describing the current SplitEvaluator. For example This may
   * contain the name of the classifier used for classifier predictive
   * evaluation. The number of key fields must be constant for a given
   * SplitEvaluator.
   * 
   * @return an array of objects containing the key.
   */
  @Override
  public Object[] getKey() {

    Object[] key = new Object[KEY_SIZE];
    key[0] = m_Template.getClass().getName();
    key[1] = m_ClassifierOptions;
    key[2] = m_ClassifierVersion;
    return key;
  }

  /**
   * Gets the data types of each of the result columns produced for a single
   * run. The number of result fields must be constant for a given
   * SplitEvaluator.
   * 
   * @return an array containing objects of the type of each result column. The
   *         objects should be Strings, or Doubles.
   */
  @Override
  public Object[] getResultTypes() {
    int addm = (m_AdditionalMeasures != null)
      ? m_AdditionalMeasures.length
      : 0;
    int overall_length = RESULT_SIZE + addm;
    overall_length += NUM_IR_STATISTICS;
    overall_length += NUM_WEIGHTED_IR_STATISTICS;
    if (getAttributeID() >= 0) {
      overall_length += 1;
    }
    if (getPredTargetColumn()) {
      overall_length += 2;
    }
    Object[] resultTypes = new Object[overall_length];
    Double doub = new Double(0);
    int current = 0;
    resultTypes[current++] = doub;
    resultTypes[current++] = doub;

    resultTypes[current++] = doub;
    resultTypes[current++] = doub;
    resultTypes[current++] = doub;
    resultTypes[current++] = doub;
    resultTypes[current++] = doub;
    resultTypes[current++] = doub;

    resultTypes[current++] = doub;
    resultTypes[current++] = doub;
    resultTypes[current++] = doub;
    resultTypes[current++] = doub;

    resultTypes[current++] = doub;
    resultTypes[current++] = doub;
    resultTypes[current++] = doub;
    resultTypes[current++] = doub;
    resultTypes[current++] = doub;
    resultTypes[current++] = doub;

    resultTypes[current++] = doub;
    resultTypes[current++] = doub;
    resultTypes[current++] = doub;
    resultTypes[current++] = doub;

    // IR stats
    resultTypes[current++] = doub;
    resultTypes[current++] = doub;
    resultTypes[current++] = doub;
    resultTypes[current++] = doub;
    resultTypes[current++] = doub;
    resultTypes[current++] = doub;
    resultTypes[current++] = doub;
    resultTypes[current++] = doub;
    resultTypes[current++] = doub;
    resultTypes[current++] = doub;
    resultTypes[current++] = doub;
    resultTypes[current++] = doub;

    // Weighted IR stats
    resultTypes[current++] = doub;
    resultTypes[current++] = doub;
    resultTypes[current++] = doub;
    resultTypes[current++] = doub;
    resultTypes[current++] = doub;
    resultTypes[current++] = doub;
    resultTypes[current++] = doub;
    resultTypes[current++] = doub;

    // Timing stats
    resultTypes[current++] = doub;
    resultTypes[current++] = doub;
    resultTypes[current++] = doub;
    resultTypes[current++] = doub;

    // sizes
    resultTypes[current++] = doub;
    resultTypes[current++] = doub;
    resultTypes[current++] = doub;

    // ID/Targets/Predictions
    if (getAttributeID() >= 0) {
      resultTypes[current++] = "";
    }
    if (getPredTargetColumn()) {
      resultTypes[current++] = "";
      resultTypes[current++] = "";
    }

    // Classifier defined extras
    resultTypes[current++] = "";

    // add any additional measures
    for (int i = 0; i < addm; i++) {
      resultTypes[current++] = doub;
    }
    if (current != overall_length) {
      throw new Error("ResultTypes didn't fit RESULT_SIZE");
    }
    return resultTypes;
  }

  /**
   * Gets the names of each of the result columns produced for a single run. The
   * number of result fields must be constant for a given SplitEvaluator.
   * 
   * @return an array containing the name of each result column
   */
  @Override
  public String[] getResultNames() {
    int addm = (m_AdditionalMeasures != null)
      ? m_AdditionalMeasures.length
      : 0;
    int overall_length = RESULT_SIZE + addm;
    overall_length += NUM_IR_STATISTICS;
    overall_length += NUM_WEIGHTED_IR_STATISTICS;
    if (getAttributeID() >= 0) {
      overall_length += 1;
    }
    if (getPredTargetColumn()) {
      overall_length += 2;
    }

    String[] resultNames = new String[overall_length];
    int current = 0;
    resultNames[current++] = "Number_of_training_instances";
    resultNames[current++] = "Number_of_testing_instances";

    // Basic performance stats - right vs wrong
    resultNames[current++] = "Number_correct";
    resultNames[current++] = "Number_incorrect";
    resultNames[current++] = "Number_unclassified";
    resultNames[current++] = "Percent_correct";
    resultNames[current++] = "Percent_incorrect";
    resultNames[current++] = "Percent_unclassified";
    resultNames[current++] = "Kappa_statistic";

    // Sensitive stats - certainty of predictions
    resultNames[current++] = "Mean_absolute_error";
    resultNames[current++] = "Root_mean_squared_error";
    resultNames[current++] = "Relative_absolute_error";
    resultNames[current++] = "Root_relative_squared_error";

    // SF stats
    resultNames[current++] = "SF_prior_entropy";
    resultNames[current++] = "SF_scheme_entropy";
    resultNames[current++] = "SF_entropy_gain";
    resultNames[current++] = "SF_mean_prior_entropy";
    resultNames[current++] = "SF_mean_scheme_entropy";
    resultNames[current++] = "SF_mean_entropy_gain";

    // K&B stats
    resultNames[current++] = "KB_information";
    resultNames[current++] = "KB_mean_information";
    resultNames[current++] = "KB_relative_information";

    // IR stats
    resultNames[current++] = "True_positive_rate";
    resultNames[current++] = "Num_true_positives";
    resultNames[current++] = "False_positive_rate";
    resultNames[current++] = "Num_false_positives";
    resultNames[current++] = "True_negative_rate";
    resultNames[current++] = "Num_true_negatives";
    resultNames[current++] = "False_negative_rate";
    resultNames[current++] = "Num_false_negatives";
    resultNames[current++] = "IR_precision";
    resultNames[current++] = "IR_recall";
    resultNames[current++] = "F_measure";
    resultNames[current++] = "Area_under_ROC";

    // Weighted IR stats
    resultNames[current++] = "Weighted_avg_true_positive_rate";
    resultNames[current++] = "Weighted_avg_false_positive_rate";
    resultNames[current++] = "Weighted_avg_true_negative_rate";
    resultNames[current++] = "Weighted_avg_false_negative_rate";
    resultNames[current++] = "Weighted_avg_IR_precision";
    resultNames[current++] = "Weighted_avg_IR_recall";
    resultNames[current++] = "Weighted_avg_F_measure";
    resultNames[current++] = "Weighted_avg_area_under_ROC";

    // Timing stats
    resultNames[current++] = "Elapsed_Time_training";
    resultNames[current++] = "Elapsed_Time_testing";
    resultNames[current++] = "UserCPU_Time_training";
    resultNames[current++] = "UserCPU_Time_testing";

    // sizes
    resultNames[current++] = "Serialized_Model_Size";
    resultNames[current++] = "Serialized_Train_Set_Size";
    resultNames[current++] = "Serialized_Test_Set_Size";

    // ID/Targets/Predictions
    if (getAttributeID() >= 0) {
      resultNames[current++] = "Instance_ID";
    }
    if (getPredTargetColumn()) {
      resultNames[current++] = "Targets";
      resultNames[current++] = "Predictions";
    }

    // Classifier defined extras
    resultNames[current++] = "Summary";
    // add any additional measures
    for (int i = 0; i < addm; i++) {
      resultNames[current++] = m_AdditionalMeasures[i];
    }
    if (current != overall_length) {
      throw new Error("ResultNames didn't fit RESULT_SIZE");
    }
    return resultNames;
  }

  /**
   * Gets the results for the supplied train and test datasets. Now performs a
   * deep copy of the classifier before it is built and evaluated (just in case
   * the classifier is not initialized properly in buildClassifier()).
   * 
   * @param train the training Instances.
   * @param test the testing Instances.
   * @return the results stored in an array. The objects stored in the array may
   *         be Strings, Doubles, or null (for the missing value).
   * @throws Exception if a problem occurs while getting the results
   */
  @Override
  public Object[] getResult(Instances train, Instances test)
    throws Exception {

    if (train.classAttribute().type() != Attribute.NOMINAL) {
      throw new Exception("Class attribute is not nominal!");
    }
    if (m_Template == null) {
      throw new Exception("No classifier has been specified");
    }
    int addm = (m_AdditionalMeasures != null) ? m_AdditionalMeasures.length : 0;
    int overall_length = RESULT_SIZE + addm;
    overall_length += NUM_IR_STATISTICS;
    overall_length += NUM_WEIGHTED_IR_STATISTICS;
    if (getAttributeID() >= 0) {
      overall_length += 1;
    }
    if (getPredTargetColumn()) {
      overall_length += 2;
    }

    ThreadMXBean thMonitor = ManagementFactory.getThreadMXBean();
    boolean canMeasureCPUTime = thMonitor.isThreadCpuTimeSupported();
    if (canMeasureCPUTime && !thMonitor.isThreadCpuTimeEnabled()) {
      thMonitor.setThreadCpuTimeEnabled(true);
    }

    Object[] result = new Object[overall_length];
    Evaluation eval = new Evaluation(train);
    m_Classifier = Classifier.makeCopy(m_Template);
    double[] predictions;
    long thID = Thread.currentThread().getId();
    long CPUStartTime = -1, trainCPUTimeElapsed = -1, testCPUTimeElapsed = -1, trainTimeStart, trainTimeElapsed, testTimeStart, testTimeElapsed;

    // training classifier
    trainTimeStart = System.currentTimeMillis();
    if (canMeasureCPUTime) {
      CPUStartTime = thMonitor.getThreadUserTime(thID);
    }
    m_Classifier.buildClassifier(train);
    if (canMeasureCPUTime) {
      trainCPUTimeElapsed = thMonitor.getThreadUserTime(thID) - CPUStartTime;
    }
    trainTimeElapsed = System.currentTimeMillis() - trainTimeStart;

    // testing classifier
    testTimeStart = System.currentTimeMillis();
    if (canMeasureCPUTime) {
      CPUStartTime = thMonitor.getThreadUserTime(thID);
    }
    predictions = eval.evaluateModel(m_Classifier, test);
    if (canMeasureCPUTime) {
      testCPUTimeElapsed = thMonitor.getThreadUserTime(thID) - CPUStartTime;
    }
    testTimeElapsed = System.currentTimeMillis() - testTimeStart;
    thMonitor = null;

    m_result = eval.toSummaryString();
    // The results stored are all per instance -- can be multiplied by the
    // number of instances to get absolute numbers
    int current = 0;
    result[current++] = new Double(train.numInstances());
    result[current++] = new Double(eval.numInstances());
    result[current++] = new Double(eval.correct());
    result[current++] = new Double(eval.incorrect());
    result[current++] = new Double(eval.unclassified());
    result[current++] = new Double(eval.pctCorrect());
    result[current++] = new Double(eval.pctIncorrect());
    result[current++] = new Double(eval.pctUnclassified());
    result[current++] = new Double(eval.kappa());

    result[current++] = new Double(eval.meanAbsoluteError());
    result[current++] = new Double(eval.rootMeanSquaredError());
    result[current++] = new Double(eval.relativeAbsoluteError());
    result[current++] = new Double(eval.rootRelativeSquaredError());

    result[current++] = new Double(eval.SFPriorEntropy());
    result[current++] = new Double(eval.SFSchemeEntropy());
    result[current++] = new Double(eval.SFEntropyGain());
    result[current++] = new Double(eval.SFMeanPriorEntropy());
    result[current++] = new Double(eval.SFMeanSchemeEntropy());
    result[current++] = new Double(eval.SFMeanEntropyGain());

    // K&B stats
    result[current++] = new Double(eval.KBInformation());
    result[current++] = new Double(eval.KBMeanInformation());
    result[current++] = new Double(eval.KBRelativeInformation());

    // IR stats
    result[current++] = new Double(eval.truePositiveRate(m_IRclass));
    result[current++] = new Double(eval.numTruePositives(m_IRclass));
    result[current++] = new Double(eval.falsePositiveRate(m_IRclass));
    result[current++] = new Double(eval.numFalsePositives(m_IRclass));
    result[current++] = new Double(eval.trueNegativeRate(m_IRclass));
    result[current++] = new Double(eval.numTrueNegatives(m_IRclass));
    result[current++] = new Double(eval.falseNegativeRate(m_IRclass));
    result[current++] = new Double(eval.numFalseNegatives(m_IRclass));
    result[current++] = new Double(eval.precision(m_IRclass));
    result[current++] = new Double(eval.recall(m_IRclass));
    result[current++] = new Double(eval.fMeasure(m_IRclass));
    result[current++] = new Double(eval.areaUnderROC(m_IRclass));

    // Weighted IR stats
    result[current++] = new Double(eval.weightedTruePositiveRate());
    result[current++] = new Double(eval.weightedFalsePositiveRate());
    result[current++] = new Double(eval.weightedTrueNegativeRate());
    result[current++] = new Double(eval.weightedFalseNegativeRate());
    result[current++] = new Double(eval.weightedPrecision());
    result[current++] = new Double(eval.weightedRecall());
    result[current++] = new Double(eval.weightedFMeasure());
    result[current++] = new Double(eval.weightedAreaUnderROC());

    // Timing stats
    result[current++] = new Double(trainTimeElapsed / 1000.0);
    result[current++] = new Double(testTimeElapsed / 1000.0);
    if (canMeasureCPUTime) {
      result[current++] =
        new Double((trainCPUTimeElapsed / 1000000.0) / 1000.0);
      result[current++] = new Double((testCPUTimeElapsed / 1000000.0) / 1000.0);
    }
    else {
      result[current++] = new Double(Instance.missingValue());
      result[current++] = new Double(Instance.missingValue());
    }

    // sizes
    ByteArrayOutputStream bastream = new ByteArrayOutputStream();
    ObjectOutputStream oostream = new ObjectOutputStream(bastream);
    oostream.writeObject(m_Classifier);
    result[current++] = new Double(bastream.size());
    bastream = new ByteArrayOutputStream();
    oostream = new ObjectOutputStream(bastream);
    oostream.writeObject(train);
    result[current++] = new Double(bastream.size());
    bastream = new ByteArrayOutputStream();
    oostream = new ObjectOutputStream(bastream);
    oostream.writeObject(test);
    result[current++] = new Double(bastream.size());

    // IDs
    if (getAttributeID() >= 0) {
      String idsString = "";
      if (test.attribute(m_attID).isNumeric()) {
        if (test.numInstances() > 0) {
          idsString += test.instance(0).value(m_attID);
        }
        for (int i = 1; i < test.numInstances(); i++) {
          idsString += "|" + test.instance(i).value(m_attID);
        }
      } else {
        if (test.numInstances() > 0) {
          idsString += test.instance(0).stringValue(m_attID);
        }
        for (int i = 1; i < test.numInstances(); i++) {
          idsString += "|" + test.instance(i).stringValue(m_attID);
        }
      }
      result[current++] = idsString;
    }

    if (getPredTargetColumn()) {
      if (test.classAttribute().isNumeric()) {
        // Targets
        if (test.numInstances() > 0) {
          String targetsString = "";
          targetsString += test.instance(0).value(test.classIndex());
          for (int i = 1; i < test.numInstances(); i++) {
            targetsString += "|" + test.instance(i).value(test.classIndex());
          }
          result[current++] = targetsString;
        }

        // Predictions
        if (predictions.length > 0) {
          String predictionsString = "";
          predictionsString += predictions[0];
          for (int i = 1; i < predictions.length; i++) {
            predictionsString += "|" + predictions[i];
          }
          result[current++] = predictionsString;
        }
      } else {
        // Targets
        if (test.numInstances() > 0) {
          String targetsString = "";
          targetsString += test.instance(0).stringValue(test.classIndex());
          for (int i = 1; i < test.numInstances(); i++) {
            targetsString +=
              "|" + test.instance(i).stringValue(test.classIndex());
          }
          result[current++] = targetsString;
        }

        // Predictions
        if (predictions.length > 0) {
          String predictionsString = "";
          predictionsString +=
            test.classAttribute().value((int) predictions[0]);
          for (int i = 1; i < predictions.length; i++) {
            predictionsString +=
              "|" + test.classAttribute().value((int) predictions[i]);
          }
          result[current++] = predictionsString;
        }
      }
    }

    if (m_Classifier instanceof Summarizable) {
      result[current++] = ((Summarizable) m_Classifier).toSummaryString();
    } else {
      result[current++] = null;
    }

    for (int i = 0; i < addm; i++) {
      if (m_doesProduce[i]) {
        try {
          double dv = ((AdditionalMeasureProducer) m_Classifier).
            getMeasure(m_AdditionalMeasures[i]);
          if (!Instance.isMissingValue(dv)) {
            Double value = new Double(dv);
            result[current++] = value;
          } else {
            result[current++] = null;
          }
        } catch (Exception ex) {
          System.err.println(ex);
        }
      } else {
        result[current++] = null;
      }
    }

    if (current != overall_length) {
      throw new Error("Results didn't fit RESULT_SIZE");
    }
    return result;
  }

  /**
   * Returns the tip text for this property
   * 
   * @return tip text for this property suitable for displaying in the
   *         explorer/experimenter gui
   */
  public String classifierTipText() {
    return "The classifier to use.";
  }

  /**
   * Get the value of Classifier.
   * 
   * @return Value of Classifier.
   */
  public Classifier getClassifier() {

    return m_Template;
  }

  /**
   * Sets the classifier.
   * 
   * @param newClassifier the new classifier to use.
   */
  public void setClassifier(Classifier newClassifier) {

    m_Template = newClassifier;
    updateOptions();
  }

  /**
   * Get the value of ClassForIRStatistics.
   * 
   * @return Value of ClassForIRStatistics.
   */
  public int getClassForIRStatistics() {
    return m_IRclass;
  }

  /**
   * Set the value of ClassForIRStatistics.
   * 
   * @param v Value to assign to ClassForIRStatistics.
   */
  public void setClassForIRStatistics(int v) {
    m_IRclass = v;
  }

  /**
   * Get the index of Attibute Identifying the instances
   * 
   * @return index of outputed Attribute.
   */
  public int getAttributeID() {
    return m_attID;
  }

  /**
   * Set the index of Attibute Identifying the instances
   * 
   * @param v index the attribute to output
   */
  public void setAttributeID(int v) {
    m_attID = v;
  }

  /**
   * @return true if the prediction and target columns must be outputed.
   */
  public boolean getPredTargetColumn() {
    return m_predTargetColumn;
  }

  /**
   * Set the flag for prediction and target output.
   * 
   * @param v true if the 2 columns have to be outputed. false otherwise.
   */
  public void setPredTargetColumn(boolean v) {
    m_predTargetColumn = v;
  }

  /**
   * Updates the options that the current classifier is using.
   */
  protected void updateOptions() {

    if (m_Template instanceof OptionHandler) {
      m_ClassifierOptions = Utils.joinOptions(((OptionHandler) m_Template)
        .getOptions());
    } else {
      m_ClassifierOptions = "";
    }
    if (m_Template instanceof Serializable) {
      ObjectStreamClass obs = ObjectStreamClass.lookup(m_Template
        .getClass());
      m_ClassifierVersion = "" + obs.getSerialVersionUID();
    } else {
      m_ClassifierVersion = "";
    }
  }

  /**
   * Set the Classifier to use, given it's class name. A new classifier will be
   * instantiated.
   * 
   * @param newClassifierName the Classifier class name.
   * @throws Exception if the class name is invalid.
   */
  public void setClassifierName(String newClassifierName) throws Exception {

    try {
      setClassifier((Classifier) Class.forName(newClassifierName)
        .newInstance());
    } catch (Exception ex) {
      throw new Exception("Can't find Classifier with class name: "
        + newClassifierName);
    }
  }

  /**
   * Gets the raw output from the classifier
   * 
   * @return the raw output from th,0e classifier
   */
  @Override
  public String getRawResultOutput() {
    StringBuffer result = new StringBuffer();

    if (m_Classifier == null) {
      return "<null> classifier";
    }
    result.append(toString());
    result.append("Classifier model: \n" + m_Classifier.toString() + '\n');

    // append the performance statistics
    if (m_result != null) {
      result.append(m_result);

      if (m_doesProduce != null) {
        for (int i = 0; i < m_doesProduce.length; i++) {
          if (m_doesProduce[i]) {
            try {
              double dv = ((AdditionalMeasureProducer) m_Classifier).
                getMeasure(m_AdditionalMeasures[i]);
              if (!Instance.isMissingValue(dv)) {
                Double value = new Double(dv);
                result.append(m_AdditionalMeasures[i] + " : " + value + '\n');
              } else {
                result.append(m_AdditionalMeasures[i] + " : " + '?' + '\n');
              }
            } catch (Exception ex) {
              System.err.println(ex);
            }
          }
        }
      }
    }
    return result.toString();
  }

  /**
   * Returns a text description of the split evaluator.
   * 
   * @return a text description of the split evaluator.
   */
  @Override
  public String toString() {

    String result = "ClassifierSplitEvaluator: ";
    if (m_Template == null) {
      return result + "<null> classifier";
    }
    return result + m_Template.getClass().getName() + " "
      + m_ClassifierOptions + "(version " + m_ClassifierVersion + ")";
  }

  /**
   * Returns the revision string.
   * 
   * @return the revision
   */
  @Override
  public String getRevision() {
    return RevisionUtils.extract("$Revision: 11198 $");
  }
} // ClassifierSplitEvaluator
