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/*
* 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 .
*/
/*
* RemoveType.java
* Copyright (C) 2002-2012 University of Waikato, Hamilton, New Zealand
*
*/
package weka.filters.unsupervised.attribute;
import java.util.Enumeration;
import java.util.Vector;
import weka.core.Attribute;
import weka.core.Capabilities;
import weka.core.Capabilities.Capability;
import weka.core.Instance;
import weka.core.Instances;
import weka.core.Option;
import weka.core.OptionHandler;
import weka.core.RevisionUtils;
import weka.core.SelectedTag;
import weka.core.Tag;
import weka.core.Utils;
import weka.filters.Filter;
import weka.filters.StreamableFilter;
import weka.filters.UnsupervisedFilter;
/**
* Removes attributes of a given type.
*
*
*
* Valid options are:
*
*
*
* -T <nominal|numeric|string|date|relational>
* Attribute type to delete. Valid options are "nominal",
* "numeric", "string", "date" and "relational".
* (default "string")
*
*
*
* -V
* Invert matching sense (i.e. only keep specified columns)
*
*
*
*
* @author Richard Kirkby ([email protected])
* @version $Revision: 10215 $
*/
public class RemoveType extends Filter implements UnsupervisedFilter,
StreamableFilter, OptionHandler {
/** for serialization */
static final long serialVersionUID = -3563999462782486279L;
/** The attribute filter used to do the filtering */
protected Remove m_attributeFilter = new Remove();
/** The type of attribute to delete */
protected int m_attTypeToDelete = Attribute.STRING;
/** Whether to invert selection */
protected boolean m_invert = false;
/** Tag allowing selection of attribute type to delete */
public static final Tag[] TAGS_ATTRIBUTETYPE = {
new Tag(Attribute.NOMINAL, "Delete nominal attributes"),
new Tag(Attribute.NUMERIC, "Delete numeric attributes"),
new Tag(Attribute.STRING, "Delete string attributes"),
new Tag(Attribute.DATE, "Delete date attributes"),
new Tag(Attribute.RELATIONAL, "Delete relational attributes") };
/**
* Returns the Capabilities of this filter.
*
* @return the capabilities of this object
* @see Capabilities
*/
@Override
public Capabilities getCapabilities() {
Capabilities result = super.getCapabilities();
result.disableAll();
// attributes
result.enable(Capability.NOMINAL_ATTRIBUTES);
result.enable(Capability.NUMERIC_ATTRIBUTES);
result.enable(Capability.DATE_ATTRIBUTES);
result.enable(Capability.STRING_ATTRIBUTES);
result.enable(Capability.RELATIONAL_ATTRIBUTES);
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 Exception if the inputFormat can't be set successfully
*/
@Override
public boolean setInputFormat(Instances instanceInfo) throws Exception {
super.setInputFormat(instanceInfo);
int[] attsToDelete = new int[instanceInfo.numAttributes()];
int numToDelete = 0;
for (int i = 0; i < instanceInfo.numAttributes(); i++) {
if (i == instanceInfo.classIndex()) {
if (!m_invert) {
continue; // skip class
} else {
attsToDelete[numToDelete++] = i; // Need to keep the class even if
// selection is inverted
}
}
if (instanceInfo.attribute(i).type() == m_attTypeToDelete) {
attsToDelete[numToDelete++] = i;
}
}
int[] finalAttsToDelete = new int[numToDelete];
System.arraycopy(attsToDelete, 0, finalAttsToDelete, 0, numToDelete);
m_attributeFilter.setAttributeIndicesArray(finalAttsToDelete);
m_attributeFilter.setInvertSelection(m_invert);
boolean result = m_attributeFilter.setInputFormat(instanceInfo);
Instances afOutputFormat = m_attributeFilter.getOutputFormat();
// restore old relation name to hide attribute filter stamp
afOutputFormat.setRelationName(instanceInfo.relationName());
setOutputFormat(afOutputFormat);
return result;
}
/**
* Input an instance for filtering.
*
* @param instance the input instance
* @return true if the filtered instance may now be collected with output().
*/
@Override
public boolean input(Instance instance) {
return m_attributeFilter.input(instance);
}
/**
* Signify that this batch of input to the filter is finished.
*
* @return true if there are instances pending output
* @throws Exception if something goes wrong
*/
@Override
public boolean batchFinished() throws Exception {
return m_attributeFilter.batchFinished();
}
/**
* Output an instance after filtering and remove from the output queue.
*
* @return the instance that has most recently been filtered (or null if the
* queue is empty).
*/
@Override
public Instance output() {
return m_attributeFilter.output();
}
/**
* Output an instance after filtering but do not remove from the output queue.
*
* @return the instance that has most recently been filtered (or null if the
* queue is empty).
*/
@Override
public Instance outputPeek() {
return m_attributeFilter.outputPeek();
}
/**
* Returns the number of instances pending output
*
* @return the number of instances pending output
*/
@Override
public int numPendingOutput() {
return m_attributeFilter.numPendingOutput();
}
/**
* Returns whether the output format is ready to be collected
*
* @return true if the output format is set
*/
@Override
public boolean isOutputFormatDefined() {
return m_attributeFilter.isOutputFormatDefined();
}
/**
* Returns an enumeration describing the available options.
*
* @return an enumeration of all the available options.
*/
@Override
public Enumeration