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• SVMLightSaver.java

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weka.core.converters.SVMLightSaver 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 .
 */

/*
 * 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.Collections;
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;

/**
 *  Writes to a destination that is in svm light
 * format.

 * 

 * For more information about svm light see:

 * 

 * http://svmlight.joachims.org/
 * 

 * 
 * 
 *  Valid options are:
 * 

 * 
 * 
 * -i <the input file>
 *  The input file
 * 
 * 
 * 
 * -o <the output file>
 *  The output file
 * 
 * 
 * 
 * -c <class index>
 *  The class index
 *  (default: last)
 * 
 * 
 * 
 * 
 * @author FracPete (fracpete at waikato dot ac dot nz)
 * @version $Revision: 10203 $
 * @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.
   */
  @Override
  public Enumeration listOptions() {
    Vector result = new Vector();

    result.addElement(new Option("\tThe class index\n" + "\t(default: last)",
      "c", 1, "-c "));

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

    return result.elements();
  }

  /**
   * returns the options of the current setup.
   * 
   * @return the current options
   */
  @Override
  public String[] getOptions() {

    Vector result = new Vector();

    result.add("-c");
    result.add(getClassIndex());

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

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

  /**
   * Parses the options for this object.
   * 

   * 
   *  Valid options are:
   * 

   * 
   * 
   * -i <the input file>
   *  The input file
   * 
   * 
   * 
   * -o <the output file>
   *  The output file
   * 
   * 
   * 
   * -c <class index>
   *  The class index
   *  (default: last)
   * 
   * 
   * 
   * 
   * @param options the options to use
   * @throws Exception if setting of options fails
   */
  @Override
  public void setOptions(String[] options) throws Exception {
    String tmpStr;

    tmpStr = Utils.getOption('c', options);
    if (tmpStr.length() != 0) {
      setClassIndex(tmpStr);
    } else {
      setClassIndex("last");
    }

    super.setOptions(options);

    Utils.checkForRemainingOptions(options);
  }

  /**
   * Returns a description of the file type.
   * 
   * @return a short file description
   */
  @Override
  public String getFileDescription() {
    return "svm light data files";
  }

  /**
   * Resets the Saver.
   */
  @Override
  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
   */
  @Override
  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
   */
  @Override
  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.
   */
  @Override
  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
   */
  @Override
  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
   */
  @Override
  public String getRevision() {
    return RevisionUtils.extract("$Revision: 10203 $");
  }

  /**
   * Main method.
   * 
   * @param args should contain the options of a Saver.
   */
  public static void main(String[] args) {
    runFileSaver(new SVMLightSaver(), args);
  }
}