/*
* 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.
*/
/*
* MakeIndicator.java
* Copyright (C) 1999 University of Waikato, Hamilton, New Zealand
*
*/
package weka.filters.unsupervised.attribute;
import weka.core.Attribute;
import weka.core.Capabilities;
import weka.core.FastVector;
import weka.core.Instance;
import weka.core.Instances;
import weka.core.Option;
import weka.core.OptionHandler;
import weka.core.Range;
import weka.core.RevisionUtils;
import weka.core.SingleIndex;
import weka.core.UnsupportedAttributeTypeException;
import weka.core.Utils;
import weka.core.Capabilities.Capability;
import weka.filters.Filter;
import weka.filters.StreamableFilter;
import weka.filters.UnsupervisedFilter;
import java.util.Enumeration;
import java.util.Vector;
/**
<!-- globalinfo-start -->
* A filter that creates a new dataset with a boolean attribute replacing a nominal attribute. In the new dataset, a value of 1 is assigned to an instance that exhibits a particular range of attribute values, a 0 to an instance that doesn't. The boolean attribute is coded as numeric by default.
* <p/>
<!-- globalinfo-end -->
*
<!-- options-start -->
* Valid options are: <p/>
*
* <pre> -C <col>
* Sets the attribute index.</pre>
*
* <pre> -V <index1,index2-index4,...>
* Specify the list of values to indicate. First and last are
* valid indexes (default last)</pre>
*
* <pre> -N <index>
* Set if new boolean attribute nominal.</pre>
*
<!-- options-end -->
*
* @author Eibe Frank (eibe@cs.waikato.ac.nz)
* @version $Revision: 1.6 $
*/
public class MakeIndicator
extends Filter
implements UnsupervisedFilter, StreamableFilter, OptionHandler {
/** for serialization */
static final long serialVersionUID = 766001176862773163L;
/** The attribute's index setting. */
private SingleIndex m_AttIndex = new SingleIndex("last");
/** The value's index */
private Range m_ValIndex;
/** Make boolean attribute numeric. */
private boolean m_Numeric = true;
/**
* Constructor
*/
public MakeIndicator() {
m_ValIndex = new Range("last");
}
/**
* Returns the Capabilities of this filter.
*
* @return the capabilities of this object
* @see Capabilities
*/
public Capabilities getCapabilities() {
Capabilities result = super.getCapabilities();
// attributes
result.enableAllAttributes();
result.enable(Capability.MISSING_VALUES);
// class
result.enableAllClasses();
result.enable(Capability.MISSING_CLASS_VALUES);
result.enable(Capability.NO_CLASS);
return result;
}
/**
* Sets the format of the input instances.
*
* @param instanceInfo an Instances object containing the input
* instance structure (any instances contained in the object are
* ignored - only the structure is required).
* @return true if the outputFormat may be collected immediately
* @throws UnsupportedAttributeTypeException the selecte attribute is not nominal
* @throws UnsupportedAttributeTypeException the selecte attribute has fewer than two values.
*/
public boolean setInputFormat(Instances instanceInfo)
throws Exception {
super.setInputFormat(instanceInfo);
m_AttIndex.setUpper(instanceInfo.numAttributes() - 1);
m_ValIndex.setUpper(instanceInfo.attribute(m_AttIndex.
getIndex()).numValues() - 1);
if (!instanceInfo.attribute(m_AttIndex.getIndex()).isNominal()) {
throw new UnsupportedAttributeTypeException("Chosen attribute not nominal.");
}
if (instanceInfo.attribute(m_AttIndex.getIndex()).numValues() < 2) {
throw new UnsupportedAttributeTypeException("Chosen attribute has less " +
"than two values.");
}
setOutputFormat();
return true;
}
/**
* Input an instance for filtering. The instance is processed
* and made available for output immediately.
*
* @param instance the input instance
* @return true if the filtered instance may now be
* collected with output().
* @throws IllegalStateException if no input format has been set.
*/
public boolean input(Instance instance) {
if (getInputFormat() == null) {
throw new IllegalStateException("No input instance format defined");
}
if (m_NewBatch) {
resetQueue();
m_NewBatch = false;
}
Instance newInstance = (Instance)instance.copy();
if (!newInstance.isMissing(m_AttIndex.getIndex())) {
if (m_ValIndex.isInRange((int)newInstance.value(m_AttIndex.getIndex()))) {
newInstance.setValue(m_AttIndex.getIndex(), 1);
} else {
newInstance.setValue(m_AttIndex.getIndex(), 0);
}
}
push(newInstance);
return true;
}
/**
* Returns an enumeration describing the available options.
*
* @return an enumeration of all the available options.
*/
public Enumeration listOptions() {
Vector newVector = new Vector(3);
newVector.addElement(new Option(
"\tSets the attribute index.",
"C", 1, "-C <col>"));
newVector.addElement(new Option(
"\tSpecify the list of values to indicate. First and last are\n"+
"\tvalid indexes (default last)",
"V", 1, "-V <index1,index2-index4,...>"));
newVector.addElement(new Option(
"\tSet if new boolean attribute nominal.",
"N", 0, "-N <index>"));
return newVector.elements();
}
/**
* Parses a given list of options. <p/>
*
<!-- options-start -->
* Valid options are: <p/>
*
* <pre> -C <col>
* Sets the attribute index.</pre>
*
* <pre> -V <index1,index2-index4,...>
* Specify the list of values to indicate. First and last are
* valid indexes (default last)</pre>
*
* <pre> -N <index>
* Set if new boolean attribute nominal.</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 attIndex = Utils.getOption('C', options);
if (attIndex.length() != 0) {
setAttributeIndex(attIndex);
} else {
setAttributeIndex("last");
}
String valIndex = Utils.getOption('V', options);
if (valIndex.length() != 0) {
setValueIndices(valIndex);
} else {
setValueIndices("last");
}
setNumeric(!Utils.getFlag('N', options));
if (getInputFormat() != null) {
setInputFormat(getInputFormat());
}
}
/**
* Gets the current settings of the filter.
*
* @return an array of strings suitable for passing to setOptions
*/
public String [] getOptions() {
String [] options = new String [5];
int current = 0;
options[current++] = "-C";
options[current++] = "" + (getAttributeIndex());
options[current++] = "-V";
options[current++] = getValueIndices();
if (!getNumeric()) {
options[current++] = "-N";
}
while (current < options.length) {
options[current++] = "";
}
return options;
}
/**
* @return a description of the filter suitable for
* displaying in the explorer/experimenter gui
*/
public String globalInfo() {
return "A filter that creates a new dataset with a boolean attribute "
+ "replacing a nominal attribute. In the new dataset, a value of 1 is "
+ "assigned to an instance that exhibits a particular range of attribute "
+ "values, a 0 to an instance that doesn't. The boolean attribute is "
+ "coded as numeric by default.";
}
/**
* @return tip text for this property suitable for
* displaying in the explorer/experimenter gui
*/
public String attributeIndexTipText() {
return "Sets which attribute should be replaced by the indicator. This "
+ "attribute must be nominal.";
}
/**
* Get the index of the attribute used.
*
* @return the index of the attribute
*/
public String getAttributeIndex() {
return m_AttIndex.getSingleIndex();
}
/**
* Sets index of the attribute used.
*
* @param attIndex the index of the attribute
*/
public void setAttributeIndex(String attIndex) {
m_AttIndex.setSingleIndex(attIndex);
}
/**
* Get the range containing the indicator values.
*
* @return the range containing the indicator values
*/
public Range getValueRange() {
return m_ValIndex;
}
/**
* @return tip text for this property suitable for
* displaying in the explorer/experimenter gui
*/
public String valueIndicesTipText() {
return "Specify range of nominal values to act on."
+ " This is a comma separated list of attribute indices (numbered from"
+ " 1), with \"first\" and \"last\" valid values. Specify an inclusive"
+ " range with \"-\". E.g: \"first-3,5,6-10,last\".";
}
/**
* Get the indices of the indicator values.
*
* @return the indices of the indicator values
*/
public String getValueIndices() {
return m_ValIndex.getRanges();
}
/**
* Sets indices of the indicator values.
*
* @param range the string representation of the indicator value indices
* @see Range
*/
public void setValueIndices(String range) {
m_ValIndex.setRanges(range);
}
/**
* Sets index of the indicator value.
*
* @param index the index of the indicator value
*/
public void setValueIndex(int index) {
setValueIndices("" + (index + 1));
}
/**
* Set which attributes are to be deleted (or kept if invert is true)
*
* @param indices an array containing indexes of attributes to select.
* Since the array will typically come from a program, attributes are indexed
* from 0.
* @throws InvalidArgumentException if an invalid set of ranges is supplied
*/
public void setValueIndicesArray(int [] indices) {
setValueIndices(Range.indicesToRangeList(indices));
}
/**
* @return tip text for this property suitable for
* displaying in the explorer/experimenter gui
*/
public String numericTipText() {
return "Determines whether the output indicator attribute is numeric. If "
+ "this is set to false, the output attribute will be nominal.";
}
/**
* Sets if the new Attribute is to be numeric.
*
* @param bool true if new Attribute is to be numeric
*/
public void setNumeric(boolean bool) {
m_Numeric = bool;
}
/**
* Check if new attribute is to be numeric.
*
* @return true if new attribute is to be numeric
*/
public boolean getNumeric() {
return m_Numeric;
}
/**
* Set the output format.
*/
private void setOutputFormat() {
Instances newData;
FastVector newAtts, newVals;
// Compute new attributes
newAtts = new FastVector(getInputFormat().numAttributes());
for (int j = 0; j < getInputFormat().numAttributes(); j++) {
Attribute att = getInputFormat().attribute(j);
if (j != m_AttIndex.getIndex()) {
// We don't have to copy the attribute because the
// attribute index remains unchanged.
newAtts.addElement(att);
} else {
if (m_Numeric) {
newAtts.addElement(new Attribute(att.name()));
} else {
String vals;
int [] sel = m_ValIndex.getSelection();
if (sel.length == 1) {
vals = att.value(sel[0]);
} else {
vals = m_ValIndex.getRanges().replace(',','_');
}
newVals = new FastVector(2);
newVals.addElement("neg_" + vals);
newVals.addElement("pos_" + vals);
newAtts.addElement(new Attribute(att.name(), newVals));
}
}
}
// Construct new header
newData = new Instances(getInputFormat().relationName(), newAtts, 0);
newData.setClassIndex(getInputFormat().classIndex());
setOutputFormat(newData);
}
/**
* Returns the revision string.
*
* @return the revision
*/
public String getRevision() {
return RevisionUtils.extract("$Revision: 1.6 $");
}
/**
* Main method for testing this class.
*
* @param argv should contain arguments to the filter:
* use -h for help
*/
public static void main(String [] argv) {
runFilter(new MakeIndicator(), argv);
}
}