/*
* 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.
*/
/*
* PrecomputedKernelMatrixKernel.java
* Copyright (C) 2008 University of Waikato, Hamilton, New Zealand
*
*/
package weka.classifiers.functions.supportVector;
import weka.core.Capabilities;
import weka.core.Instance;
import weka.core.Instances;
import weka.core.Option;
import weka.core.RevisionUtils;
import weka.core.Utils;
import weka.core.Capabilities.Capability;
import weka.core.matrix.Matrix;
import java.io.File;
import java.io.FileReader;
import java.util.Enumeration;
import java.util.Vector;
/**
*
<!-- globalinfo-start -->
* 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.
* <p/>
<!-- globalinfo-end -->
*
<!-- options-start -->
* Valid options are: <p/>
*
* <pre> -D
* Enables debugging output (if available) to be printed.
* (default: off)</pre>
*
* <pre> -no-checks
* Turns off all checks - use with caution!
* (default: checks on)</pre>
*
* <pre> -M <file name>
* The file name of the file that holds the kernel matrix.
* (default: kernelMatrix.matrix)</pre>
*
<!-- options-end -->
*
* @author Eibe Frank (eibe@cs.waikato.ac.nz)
* @version $Revision: 5450 $
*/
public class PrecomputedKernelMatrixKernel extends Kernel {
/** 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;
/**
* Returns a string describing the kernel
*
* @return a description suitable for displaying in the
* explorer/experimenter gui
*/
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.
*/
public Enumeration listOptions() {
Vector result;
result = new Vector();
Enumeration en = super.listOptions();
while (en.hasMoreElements())
result.addElement(en.nextElement());
result.addElement(new Option(
"\tThe file name of the file that holds the kernel matrix.\n"
+ "\t(default: kernelMatrix.matrix)",
"M", 1, "-M <file name>"));
return result.elements();
}
/**
* Parses a given list of options. <p/>
*
<!-- options-start -->
* Valid options are: <p/>
*
* <pre> -D
* Enables debugging output (if available) to be printed.
* (default: off)</pre>
*
* <pre> -no-checks
* Turns off all checks - use with caution!
* (default: checks on)</pre>
*
* <pre> -M <file name>
* The file name of the file that holds the kernel matrix.
* (default: kernelMatrix.matrix)</pre>
*
<!-- options-end -->
*
* @param options the list of options as an array of strings
* @throws Exception if an option is not supported
*/
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
*/
public String[] getOptions() {
int i;
Vector<String> result;
String[] options;
result = new Vector<String>();
options = super.getOptions();
for (i = 0; i < options.length; i++)
result.add(options[i]);
result.add("-M");
result.add("" + getKernelMatrixFile());
return (String[]) 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
*/
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
*/
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
*/
public Capabilities getCapabilities() {
Capabilities result = super.getCapabilities();
result.disableAll();
result.enable(Capability.NOMINAL_ATTRIBUTES);
result.enableAllClasses();
result.enable(Capability.MISSING_CLASS_VALUES);
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
*/
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.
*/
public void clean() {
// do nothing
}
/**
* Returns the number of kernel evaluation performed.
*
* @return the number of kernel evaluation performed.
*/
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.
*/
public int numCacheHits() {
return 0;
}
/**
* Returns the revision string.
*
* @return the revision
*/
public String getRevision() {
return RevisionUtils.extract("$Revision: 5450 $");
}
}