/*
* 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 <http://www.gnu.org/licenses/>.
*/
/*
* SVMLightSaver.java
* Copyright (C) 2006-2012 University of Waikato, Hamilton, NZ
*
*/
package weka.core.converters;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration;
import java.util.Vector;
import weka.core.Capabilities;
import weka.core.Capabilities.Capability;
import weka.core.Instance;
import weka.core.Instances;
import weka.core.Option;
import weka.core.RevisionUtils;
import weka.core.SingleIndex;
import weka.core.Utils;
/**
<!-- globalinfo-start -->
* Writes to a destination that is in svm light format.<br/>
* <br/>
* For more information about svm light see:<br/>
* <br/>
* http://svmlight.joachims.org/
* <p/>
<!-- globalinfo-end -->
*
<!-- options-start -->
* Valid options are: <p/>
*
* <pre> -i <the input file>
* The input file</pre>
*
* <pre> -o <the output file>
* The output file</pre>
*
* <pre> -c <class index>
* The class index
* (default: last)</pre>
*
<!-- options-end -->
*
* @author FracPete (fracpete at waikato dot ac dot nz)
* @version $Revision: 8034 $
* @see Saver
*/
public class SVMLightSaver
extends AbstractFileSaver
implements BatchConverter, IncrementalConverter {
/** for serialization. */
private static final long serialVersionUID = 2605714599263995835L;
/** the file extension. */
public static String FILE_EXTENSION = SVMLightLoader.FILE_EXTENSION;
/** the number of digits after the decimal point. */
public static int MAX_DIGITS = 18;
/** the class index. */
protected SingleIndex m_ClassIndex = new SingleIndex("last");
/**
* Constructor.
*/
public SVMLightSaver(){
resetOptions();
}
/**
* Returns a string describing this Saver.
*
* @return a description of the Saver suitable for
* displaying in the explorer/experimenter gui
*/
public String globalInfo() {
return
"Writes to a destination that is in svm light format.\n\n"
+ "For more information about svm light see:\n\n"
+ "http://svmlight.joachims.org/";
}
/**
* Returns an enumeration describing the available options.
*
* @return an enumeration of all the available options.
*/
public Enumeration listOptions() {
Vector<Option> result;
result = new Vector<Option>();
Enumeration en = super.listOptions();
while (en.hasMoreElements())
result.addElement((Option)en.nextElement());
result.addElement(
new Option(
"\tThe class index\n"
+ "\t(default: last)",
"c", 1, "-c <class index>"));
return result.elements();
}
/**
* returns the options of the current setup.
*
* @return the current options
*/
public String[] getOptions(){
int i;
Vector<String> result;
String[] options;
result = new Vector<String>();
result.add("-c");
result.add(getClassIndex());
options = super.getOptions();
for (i = 0; i < options.length; i++)
result.add(options[i]);
return (String[]) result.toArray(new String[result.size()]);
}
/**
* Parses the options for this object. <p/>
*
<!-- options-start -->
* Valid options are: <p/>
*
* <pre> -i <the input file>
* The input file</pre>
*
* <pre> -o <the output file>
* The output file</pre>
*
* <pre> -c <class index>
* The class index
* (default: last)</pre>
*
<!-- options-end -->
*
* @param options the options to use
* @throws Exception if setting of options fails
*/
public void setOptions(String[] options) throws Exception {
String tmpStr;
super.setOptions(options);
tmpStr = Utils.getOption('c', options);
if (tmpStr.length() != 0)
setClassIndex(tmpStr);
else
setClassIndex("last");
}
/**
* Returns a description of the file type.
*
* @return a short file description
*/
public String getFileDescription() {
return "svm light data files";
}
/**
* Resets the Saver.
*/
public void resetOptions() {
super.resetOptions();
setFileExtension(SVMLightLoader.FILE_EXTENSION);
}
/**
* Returns the tip text for this property.
*
* @return tip text for this property suitable for
* displaying in the explorer/experimenter gui
*/
public String classIndexTipText() {
return "Sets the class index (\"first\" and \"last\" are valid values)";
}
/**
* Get the index of the class attribute.
*
* @return the index of the class attribute
*/
public String getClassIndex() {
return m_ClassIndex.getSingleIndex();
}
/**
* Sets index of the class attribute.
*
* @param value the index of the class attribute
*/
public void setClassIndex(String value) {
m_ClassIndex.setSingleIndex(value);
}
/**
* Returns the Capabilities of this saver.
*
* @return the capabilities of this object
* @see Capabilities
*/
public Capabilities getCapabilities() {
Capabilities result = super.getCapabilities();
// attributes
result.enable(Capability.NOMINAL_ATTRIBUTES);
result.enable(Capability.NUMERIC_ATTRIBUTES);
result.enable(Capability.DATE_ATTRIBUTES);
// class
result.enable(Capability.BINARY_CLASS);
result.enable(Capability.NUMERIC_CLASS);
result.enable(Capability.DATE_CLASS);
return result;
}
/**
* Sets instances that should be stored.
*
* @param instances the instances
*/
public void setInstances(Instances instances) {
m_ClassIndex.setUpper(instances.numAttributes() - 1);
instances.setClassIndex(m_ClassIndex.getIndex());
super.setInstances(instances);
}
/**
* turns the instance into a svm light row.
*
* @param inst the instance to transform
* @return the generated svm light row
*/
protected String instanceToSvmlight(Instance inst) {
StringBuffer result;
int i;
result = new StringBuffer();
// class
if (inst.classAttribute().isNominal()) {
if (inst.classValue() == 0)
result.append("1");
else if (inst.classValue() == 1)
result.append("-1");
}
else {
result.append("" + Utils.doubleToString(inst.classValue(), MAX_DIGITS));
}
// attributes
for (i = 0; i < inst.numAttributes(); i++) {
if (i == inst.classIndex())
continue;
if (inst.value(i) == 0)
continue;
result.append(" " + (i+1) + ":" + Utils.doubleToString(inst.value(i), MAX_DIGITS));
}
return result.toString();
}
/**
* Saves an instances incrementally. Structure has to be set by using the
* setStructure() method or setInstances() method.
*
* @param inst the instance to save
* @throws IOException throws IOEXception if an instance cannot be
* saved incrementally.
*/
public void writeIncremental(Instance inst) throws IOException{
int writeMode = getWriteMode();
Instances structure = getInstances();
PrintWriter outW = null;
if ((getRetrieval() == BATCH) || (getRetrieval() == NONE))
throw new IOException("Batch and incremental saving cannot be mixed.");
if (getWriter() != null)
outW = new PrintWriter(getWriter());
if (writeMode == WAIT) {
if (structure == null) {
setWriteMode(CANCEL);
if (inst != null)
System.err.println("Structure (Header Information) has to be set in advance");
}
else {
setWriteMode(STRUCTURE_READY);
}
writeMode = getWriteMode();
}
if (writeMode == CANCEL) {
if (outW != null)
outW.close();
cancel();
}
// header
if (writeMode == STRUCTURE_READY) {
setWriteMode(WRITE);
// no header
writeMode = getWriteMode();
}
// row
if (writeMode == WRITE){
if (structure == null)
throw new IOException("No instances information available.");
if (inst != null) {
//write instance
if ((retrieveFile() == null) && (outW == null)) {
System.out.println(instanceToSvmlight(inst));
}
else {
outW.println(instanceToSvmlight(inst));
m_incrementalCounter++;
//flush every 100 instances
if (m_incrementalCounter > 100){
m_incrementalCounter = 0;
outW.flush();
}
}
}
else{
//close
if (outW != null) {
outW.flush();
outW.close();
}
m_incrementalCounter = 0;
resetStructure();
outW = null;
resetWriter();
}
}
}
/**
* Writes a Batch of instances.
*
* @throws IOException throws IOException if saving in batch mode
* is not possible
*/
public void writeBatch() throws IOException {
if (getInstances() == null)
throw new IOException("No instances to save");
if (getRetrieval() == INCREMENTAL)
throw new IOException("Batch and incremental saving cannot be mixed.");
setRetrieval(BATCH);
setWriteMode(WRITE);
if ((retrieveFile() == null) && (getWriter() == null)) {
for (int i = 0; i < getInstances().numInstances(); i++)
System.out.println(instanceToSvmlight(getInstances().instance(i)));
setWriteMode(WAIT);
}
else {
PrintWriter outW = new PrintWriter(getWriter());
for (int i = 0; i < getInstances().numInstances(); i++)
outW.println(instanceToSvmlight(getInstances().instance(i)));
outW.flush();
outW.close();
setWriteMode(WAIT);
outW = null;
resetWriter();
setWriteMode(CANCEL);
}
}
/**
* Returns the revision string.
*
* @return the revision
*/
public String getRevision() {
return RevisionUtils.extract("$Revision: 8034 $");
}
/**
* Main method.
*
* @param args should contain the options of a Saver.
*/
public static void main(String[] args) {
runFileSaver(new SVMLightSaver(), args);
}
}