Exemplo n.º 1
0
  /**
   * Trains the classifier on the array of Signal objects. Implementations of this method should
   * also produce an ordered list of the class names which can be returned with the <code>
   * getClassNames</code> method.
   *
   * @param inputData the Signal array that the model should be trained on.
   * @throws noMetadataException Thrown if there is no class metadata to train the Gaussian model
   *     with
   */
  public void train(Signal[] inputData) {

    List classNamesList = new ArrayList();
    for (int i = 0; i < inputData.length; i++) {
      try {
        String className = inputData[i].getStringMetadata(Signal.PROP_CLASS);
        if ((className != null) && (!classNamesList.contains(className))) {
          classNamesList.add(className);
        }
      } catch (noMetadataException ex) {
        throw new RuntimeException("No class metadata found to train model on!", ex);
      }
    }
    Collections.sort(classNamesList);
    classnames = (String[]) classNamesList.toArray(new String[classNamesList.size()]);

    FastVector classValues = new FastVector(classnames.length);
    for (int i = 0; i < classnames.length; i++) {
      classValues.addElement(classnames[i]);
    }
    classAttribute = new Attribute(Signal.PROP_CLASS, classValues);
    Instances trainingDataSet =
        new Instances(Signal2Instance.convert(inputData[0], classAttribute));

    if (inputData.length > 1) {
      for (int i = 1; i < inputData.length; i++) {
        Instances aSignalInstance = Signal2Instance.convert(inputData[i], classAttribute);
        for (int j = 0; j < aSignalInstance.numInstances(); j++)
          trainingDataSet.add(aSignalInstance.instance(j));
      }
    }

    trainingDataSet.setClass(classAttribute);

    inputData = null;
    theRule = new MISMO();

    // parse options
    StringTokenizer stOption = new StringTokenizer(this.MISMOOptions, " ");
    String[] options = new String[stOption.countTokens()];
    for (int i = 0; i < options.length; i++) {
      options[i] = stOption.nextToken();
    }

    try {
      theRule.setOptions(options);
    } catch (Exception ex) {
      throw new RuntimeException("Failed to set MISMO classifier options!", ex);
    }
    try {
      theRule.buildClassifier(trainingDataSet);
      System.out.println("WEKA: outputting MISMO classifier; " + theRule.globalInfo());
    } catch (Exception ex) {
      throw new RuntimeException("Failed to train classifier!", ex);
    }
  }
Exemplo n.º 2
0
  /**
   * Calculates the probability of class membership of a Signal Object.
   *
   * @param inputSignal The Signal object to calculate the probabilities of class membership for.
   *     This probabilities should be ordered such that the indexes match the class names returned
   *     by <code>getClassNames</code>.
   * @return An array of the probabilities of class membership
   */
  public double[] probabilities(Signal inputSignal) {

    Instances theData = Signal2Instance.convert(inputSignal, this.classAttribute);

    double[] probsAccum = new double[this.getNumClasses()];
    for (int i = 0; i < theData.numInstances(); i++) {
      double[] temp;
      try {
        temp = theRule.distributionForInstance(theData.instance(i));
        //                if(this.verbose){
        //                    System.out.print("distribution:" );
        //                    for (int j=0;j<this.getNumClasses();j++) {
        //                        System.out.print(" " + temp[j]);
        //                    }
        //                    System.out.println("");
        //                }

      } catch (Exception ex) {
        System.out.println(
            "Exception occured when calculating distribution for a vector!\n" + ex.getMessage());
        ex.printStackTrace();
        return null;
      }
      for (int j = 0; j < this.getNumClasses(); j++) {
        probsAccum[j] += Math.log(temp[j]);
      }
    }

    //        if(this.verbose){
    //            System.out.print("Log Probs:" );
    //            for (int j=0;j<this.getNumClasses();j++) {
    //                System.out.print(" " + probsAccum[j]);
    //            }
    //            System.out.println("");
    //        }

    // normalise to range 0:1
    double min = Double.POSITIVE_INFINITY;
    double max = Double.NEGATIVE_INFINITY;
    for (int j = 0; j < this.getNumClasses(); j++) {
      if (probsAccum[j] > max) {
        max = probsAccum[j];
      }
      if (probsAccum[j] < min) {
        min = probsAccum[j];
      }
    }
    for (int j = 0; j < this.getNumClasses(); j++) {
      probsAccum[j] -= min;
      probsAccum[j] /= (max - min);
    }
    // normalise to sum to 1
    double total = 0.0;
    for (int j = 0; j < this.getNumClasses(); j++) {
      total += probsAccum[j];
    }
    if (verbose) {
      DecimalFormat dec = new DecimalFormat();
      dec.setMaximumFractionDigits(3);
      if (this.verbose) {
        System.out.print("Probabilities:");
      }

      for (int j = 0; j < this.getNumClasses(); j++) {
        probsAccum[j] /= total;
        if (verbose) {
          System.out.print(" " + dec.format(probsAccum[j]));
        }
      }
      if (verbose) {
        try {
          System.out.println("\t" + inputSignal.getStringMetadata(Signal.PROP_FILE_LOCATION));
        } catch (noMetadataException nme) {
          nme.printStackTrace(System.out);
        }
      }
    }

    return probsAccum;
  }