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Remove.java
Package: Weka-3-2.rar [view]
Upload User: rhdiban
Upload Date: 2013-08-09
Package Size: 15085k
Code Size: 10k
Category:
Windows Develop
Development Platform:
Java
- /*
- * 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.
- */
- /*
- * Remove.java
- * Copyright (C) 1999 Len Trigg
- *
- */
- package weka.filters.unsupervised.attribute;
- import weka.filters.*;
- import java.io.*;
- import java.util.*;
- import weka.core.*;
- /**
- * An instance filter that deletes a range of attributes from the dataset.<p>
- *
- * Valid filter-specific options are:<p>
- *
- * -R index1,index2-index4,...<br>
- * Specify list of columns to delete. First and last are valid indexes.
- * (default none)<p>
- *
- * -V<br>
- * Invert matching sense (i.e. only keep specified columns)<p>
- *
- * @author Len Trigg (trigg@cs.waikato.ac.nz)
- * @version $Revision: 1.1 $
- */
- public class Remove extends Filter
- implements UnsupervisedFilter, StreamableFilter, OptionHandler {
- /** Stores which columns to select as a funky range */
- protected Range m_SelectCols = new Range();
- /**
- * Stores the indexes of the selected attributes in order, once the
- * dataset is seen
- */
- protected int [] m_SelectedAttributes;
- /**
- * Contains an index of string attributes in the input format
- * that will survive the filtering process
- */
- protected int [] m_InputStringIndex;
- /**
- * Returns an enumeration describing the available options.
- *
- * @return an enumeration of all the available options.
- */
- public Enumeration listOptions() {
- Vector newVector = new Vector(2);
- newVector.addElement(new Option(
- "tSpecify list of columns to delete. First and last are validn"
- +"tindexes. (default none)",
- "R", 1, "-R <index1,index2-index4,...>"));
- newVector.addElement(new Option(
- "tInvert matching sense (i.e. only keep specified columns)",
- "V", 0, "-V"));
- return newVector.elements();
- }
- /**
- * Parses a given list of options controlling the behaviour of this object.
- * Valid options are:<p>
- *
- * -R index1,index2-index4,...<br>
- * Specify list of columns to delete. First and last are valid indexes.
- * (default none)<p>
- *
- * -V<br>
- * Invert matching sense (i.e. only keep specified columns)<p>
- *
- * @param options the list of options as an array of strings
- * @exception Exception if an option is not supported
- */
- public void setOptions(String[] options) throws Exception {
- String deleteList = Utils.getOption('R', options);
- if (deleteList.length() != 0) {
- setAttributeIndices(deleteList);
- }
- setInvertSelection(Utils.getFlag('V', 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 [3];
- int current = 0;
- if (getInvertSelection()) {
- options[current++] = "-V";
- }
- if (!getAttributeIndices().equals("")) {
- options[current++] = "-R"; options[current++] = getAttributeIndices();
- }
- while (current < options.length) {
- options[current++] = "";
- }
- return options;
- }
- /**
- * 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
- * @exception Exception if the format couldn't be set successfully
- */
- public boolean setInputFormat(Instances instanceInfo) throws Exception {
- super.setInputFormat(instanceInfo);
- m_SelectCols.setUpper(instanceInfo.numAttributes() - 1);
- // Create the output buffer
- FastVector attributes = new FastVector();
- int outputClass = -1;
- m_SelectedAttributes = m_SelectCols.getSelection();
- int inStrKeepLen = 0;
- int [] inStrKeep = new int[m_SelectedAttributes.length];
- for (int i = 0; i < m_SelectedAttributes.length; i++) {
- int current = m_SelectedAttributes[i];
- if (instanceInfo.classIndex() == current) {
- outputClass = attributes.size();
- }
- Attribute keep = (Attribute)instanceInfo.attribute(current).copy();
- if (keep.type() == Attribute.STRING) {
- inStrKeep[inStrKeepLen++] = current;
- }
- attributes.addElement(keep);
- }
- m_InputStringIndex = new int [inStrKeepLen];
- System.arraycopy(inStrKeep, 0, m_InputStringIndex, 0, inStrKeepLen);
- Instances outputFormat = new Instances(instanceInfo.relationName(),
- attributes, 0);
- outputFormat.setClassIndex(outputClass);
- setOutputFormat(outputFormat);
- return true;
- }
- /**
- * Input an instance for filtering. Ordinarily the instance is processed
- * and made available for output immediately. Some filters require all
- * instances be read before producing output.
- *
- * @param instance the input instance
- * @return true if the filtered instance may now be
- * collected with output().
- * @exception IllegalStateException if no input structure has been defined.
- */
- public boolean input(Instance instance) {
- if (getInputFormat() == null) {
- throw new IllegalStateException("No input instance format defined");
- }
- if (m_NewBatch) {
- resetQueue();
- m_NewBatch = false;
- }
- double [] vals = new double[getOutputFormat().numAttributes()];
- for (int i = 0; i < m_SelectedAttributes.length; i++) {
- int current = m_SelectedAttributes[i];
- vals[i] = instance.value(current);
- }
- Instance inst = null;
- if (instance instanceof SparseInstance) {
- inst = new SparseInstance(instance.weight(), vals);
- } else {
- inst = new Instance(instance.weight(), vals);
- }
- copyStringValues(inst, false, instance.dataset(), m_InputStringIndex,
- getOutputFormat(), getOutputStringIndex());
- inst.setDataset(getOutputFormat());
- push(inst);
- return true;
- }
- /**
- * Returns a string describing this filter
- *
- * @return a description of the filter suitable for
- * displaying in the explorer/experimenter gui
- */
- public String globalInfo() {
- return "An instance filter that removes a range of"
- + " attributes from the dataset.";
- }
- /**
- * Returns the tip text for this property
- *
- * @return tip text for this property suitable for
- * displaying in the explorer/experimenter gui
- */
- public String invertSelectionTipText() {
- return "Determines whether action is to select or delete."
- + " If set to true, only the specified attributes will be kept;"
- + " If set to false, specified attributes will be deleted.";
- }
- /**
- * Get whether the supplied columns are to be removed or kept
- *
- * @return true if the supplied columns will be kept
- */
- public boolean getInvertSelection() {
- return !m_SelectCols.getInvert();
- }
- /**
- * Set whether selected columns should be removed or kept. If true the
- * selected columns are kept and unselected columns are deleted. If false
- * selected columns are deleted and unselected columns are kept.
- *
- * @param invert the new invert setting
- */
- public void setInvertSelection(boolean invert) {
- m_SelectCols.setInvert(!invert);
- }
- /**
- * Returns the tip text for this property
- *
- * @return tip text for this property suitable for
- * displaying in the explorer/experimenter gui
- */
- public String attributeIndicesTipText() {
- return "Specify range of attributes to act on."
- + " This is a comma separated list of attribute indices, with"
- + " "first" and "last" valid values. Specify an inclusive"
- + " range with "-". E.g: "first-3,5,6-10,last".";
- }
- /**
- * Get the current range selection.
- *
- * @return a string containing a comma separated list of ranges
- */
- public String getAttributeIndices() {
- return m_SelectCols.getRanges();
- }
- /**
- * Set which attributes are to be deleted (or kept if invert is true)
- *
- * @param rangeList a string representing the list of attributes. Since
- * the string will typically come from a user, attributes are indexed from
- * 1. <br>
- * eg: first-3,5,6-last
- */
- public void setAttributeIndices(String rangeList) {
- m_SelectCols.setRanges(rangeList);
- }
- /**
- * Set which attributes are to be deleted (or kept if invert is true)
- *
- * @param attributes an array containing indexes of attributes to select.
- * Since the array will typically come from a program, attributes are indexed
- * from 0.
- */
- public void setAttributeIndicesArray(int [] attributes) {
- setAttributeIndices(Range.indicesToRangeList(attributes));
- }
- /**
- * Main method for testing this class.
- *
- * @param argv should contain arguments to the filter: use -h for help
- */
- public static void main(String [] argv) {
- try {
- if (Utils.getFlag('b', argv)) {
- Filter.batchFilterFile(new Remove(), argv);
- } else {
- Filter.filterFile(new Remove(), argv);
- }
- } catch (Exception ex) {
- System.out.println(ex.getMessage());
- }
- }
- }