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• PrecomputedKernelMatrixKernel.java

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weka.classifiers.functions.supportVector.PrecomputedKernelMatrixKernel Maven / Gradle / Ivy

/*
 *   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 3 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, see .
 */

/*
 *    PrecomputedKernelMatrixKernel.java
 *    Copyright (C) 2008-2012 University of Waikato, Hamilton, New Zealand
 *
 */
package weka.classifiers.functions.supportVector;

import java.io.File;
import java.io.FileReader;
import java.util.Collections;
import java.util.Enumeration;
import java.util.Vector;

import weka.core.Capabilities;
import weka.core.Capabilities.Capability;
import weka.core.Copyable;
import weka.core.Instance;
import weka.core.Instances;
import weka.core.Option;
import weka.core.RevisionUtils;
import weka.core.Utils;
import weka.core.matrix.Matrix;

/**
 * 
  This kernel is based on a static kernel matrix that
 * is read from a file. Instances must have a single nominal attribute
 * (excluding the class). This attribute must be the first attribute in the file
 * and its values are used to reference rows/columns in the kernel matrix. The
 * second attribute must be the class attribute.
 * 

 * 
 * 
 *  Valid options are:
 * 

 * 
 * 
 * -D
 *  Enables debugging output (if available) to be printed.
 *  (default: off)
 * 
 *
 * 
 * -M <file name>
 *  The file name of the file that holds the kernel matrix.
 *  (default: kernelMatrix.matrix)
 * 
 *
 * 
 * 
 * @author Eibe Frank ([email protected])
 * @version $Revision: 14512 $
 */
public class PrecomputedKernelMatrixKernel extends Kernel implements Copyable {

  /** for serialization */
  static final long serialVersionUID = -321831645846363333L;

  /** The file holding the kernel matrix. */
  protected File m_KernelMatrixFile = new File("kernelMatrix.matrix");

  /** The kernel matrix. */
  protected Matrix m_KernelMatrix;

  /** A classifier counter. */
  protected int m_Counter;

  /**
   * Return a shallow copy of this kernel
   * 
   * @return a shallow copy of this kernel
   */
  @Override
  public Object copy() {
    PrecomputedKernelMatrixKernel newK = new PrecomputedKernelMatrixKernel();

    newK.setKernelMatrix(m_KernelMatrix);
    newK.setKernelMatrixFile(m_KernelMatrixFile);
    newK.m_Counter = m_Counter;

    return newK;
  }

  /**
   * Returns a string describing the kernel
   * 
   * @return a description suitable for displaying in the explorer/experimenter
   *         gui
   */
  @Override
  public String globalInfo() {
    return "This kernel is based on a static kernel matrix that is read from a file. "
      + "Instances must have a single nominal attribute (excluding the class). "
      + "This attribute must be the first attribute in the file and its values are "
      + "used to reference rows/columns in the kernel matrix. The second attribute "
      + "must be the class attribute.";
  }

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

    result.addElement(new Option(
      "\tThe file name of the file that holds the kernel matrix.\n"
        + "\t(default: kernelMatrix.matrix)", "M", 1, "-M "));

    result.addAll(Collections.list(super.listOptions()));

    return result.elements();
  }

  /**
   * Parses a given list of options.
   * 

   * 
   *  Valid options are:
   * 

   * 
   * 
   * -D
   *  Enables debugging output (if available) to be printed.
   *  (default: off)
   * 
   *
   * 
   * -M <file name>
   *  The file name of the file that holds the kernel matrix.
   *  (default: kernelMatrix.matrix)
   * 
   * 
   * 
   * 
   * @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 tmpStr;

    tmpStr = Utils.getOption('M', options);
    if (tmpStr.length() != 0) {
      setKernelMatrixFile(new File(tmpStr));
    } else {
      setKernelMatrixFile(new File("kernelMatrix.matrix"));
    }

    super.setOptions(options);
  }

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

    Vector result = new Vector();

    result.add("-M");
    result.add("" + getKernelMatrixFile());

    Collections.addAll(result, super.getOptions());

    return result.toArray(new String[result.size()]);
  }

  /**
   * 
   * @param id1 the index of instance 1
   * @param id2 the index of instance 2
   * @param inst1 the instance 1 object
   * @return the dot product
   * @throws Exception if something goes wrong
   */
  @Override
  public double eval(int id1, int id2, Instance inst1) throws Exception {

    if (m_KernelMatrix == null) {
      throw new IllegalArgumentException(
        "Kernel matrix has not been loaded successfully.");
    }
    int index1 = -1;
    if (id1 > -1) {
      index1 = (int) m_data.instance(id1).value(0);
    } else {
      index1 = (int) inst1.value(0);
    }
    int index2 = (int) m_data.instance(id2).value(0);
    return m_KernelMatrix.get(index1, index2);
  }

  /**
   * initializes variables etc.
   * 
   * @param data the data to use
   */
  @Override
  protected void initVars(Instances data) {
    super.initVars(data);

    try {
      if (m_KernelMatrix == null) {
        m_KernelMatrix = new Matrix(new FileReader(m_KernelMatrixFile));
        // System.err.println("Read kernel matrix.");
      }
    } catch (Exception e) {
      System.err.println("Problem reading matrix from " + m_KernelMatrixFile);
    }
    m_Counter++;
    // System.err.print("Building classifier: " + m_Counter + "\r");
  }

  /**
   * Returns the Capabilities of this kernel.
   * 
   * @return the capabilities of this object
   * @see Capabilities
   */
  @Override
  public Capabilities getCapabilities() {
    Capabilities result = super.getCapabilities();
    result.disableAll();

    result.enable(Capability.NOMINAL_ATTRIBUTES);
    result.enableAllClasses();
    result.enable(Capability.MISSING_CLASS_VALUES);
    result.enable(Capability.NO_CLASS);

    return result;
  }

  /**
   * Sets the file holding the kernel matrix
   * 
   * @param f the file holding the matrix
   */
  public void setKernelMatrixFile(File f) {
    m_KernelMatrixFile = f;
  }

  /**
   * Gets the file containing the kernel matrix.
   * 
   * @return the exponent value
   */
  public File getKernelMatrixFile() {
    return m_KernelMatrixFile;
  }

  /**
   * Returns the tip text for this property
   * 
   * @return tip text for this property suitable for displaying in the
   *         explorer/experimenter gui
   */
  public String kernelMatrixFileTipText() {
    return "The file holding the kernel matrix.";
  }

  /**
   * Set the kernel matrix. This method is used by the unit test for this class,
   * as it loads at test matrix as a system resource.
   * 
   * @param km the kernel matrix to use
   */
  protected void setKernelMatrix(Matrix km) {
    m_KernelMatrix = km;
  }

  /**
   * returns a string representation for the Kernel
   * 
   * @return a string representaiton of the kernel
   */
  @Override
  public String toString() {
    return "Using kernel matrix from file with name: " + getKernelMatrixFile();
  }

  /**
   * Frees the memory used by the kernel. (Useful with kernels which use cache.)
   * This function is called when the training is done. i.e. after that, eval
   * will be called with id1 == -1.
   */
  @Override
  public void clean() {
    // do nothing
  }

  /**
   * Returns the number of kernel evaluation performed.
   * 
   * @return the number of kernel evaluation performed.
   */
  @Override
  public int numEvals() {
    return 0;
  }

  /**
   * Returns the number of dot product cache hits.
   * 
   * @return the number of dot product cache hits, or -1 if not supported by
   *         this kernel.
   */
  @Override
  public int numCacheHits() {
    return 0;
  }

  /**
   * Returns the revision string.
   * 
   * @return the revision
   */
  @Override
  public String getRevision() {
    return RevisionUtils.extract("$Revision: 14512 $");
  }
}