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NumericToBinary.java
Package: Weka-3-2.rar [view]
Upload User: rhdiban
Upload Date: 2013-08-09
Package Size: 15085k
Code Size: 5k
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.
- */
- /*
- * NumericToBinary.java
- * Copyright (C) 1999 Eibe Frank
- *
- */
- package weka.filters.unsupervised.attribute;
- import weka.filters.*;
- import java.io.*;
- import java.util.*;
- import weka.core.*;
- /**
- * Converts all numeric attributes into binary attributes (apart from
- * the class attribute): if the value of the numeric attribute is
- * exactly zero, the value of the new attribute will be zero. If the
- * value of the numeric attribute is missing, the value of the new
- * attribute will be missing. Otherwise, the value of the new
- * attribute will be one. The new attributes will nominal.<p>
- *
- * @author Eibe Frank (eibe@cs.waikato.ac.nz)
- * @version $Revision: 1.1 $
- */
- public class NumericToBinary extends Filter
- implements UnsupervisedFilter, StreamableFilter {
- /**
- * 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 input format can't be set
- * successfully
- */
- public boolean setInputFormat(Instances instanceInfo) throws Exception {
- super.setInputFormat(instanceInfo);
- setOutputFormat();
- return true;
- }
- /**
- * Input an instance for filtering.
- *
- * @param instance the input instance
- * @return true if the filtered instance may now be
- * collected with output().
- * @exception IllegalStateException if no input format 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;
- }
- convertInstance(instance);
- return true;
- }
- /**
- * Set the output format.
- */
- private void setOutputFormat() {
- FastVector newAtts;
- int newClassIndex;
- StringBuffer attributeName;
- Instances outputFormat;
- FastVector vals;
- // Compute new attributes
- newClassIndex = getInputFormat().classIndex();
- newAtts = new FastVector();
- for (int j = 0; j < getInputFormat().numAttributes(); j++) {
- Attribute att = getInputFormat().attribute(j);
- if ((j == newClassIndex) || (!att.isNumeric())) {
- newAtts.addElement(att.copy());
- } else {
- attributeName = new StringBuffer(att.name() + "_binarized");
- vals = new FastVector(2);
- vals.addElement("0"); vals.addElement("1");
- newAtts.addElement(new Attribute(attributeName.toString(), vals));
- }
- }
- outputFormat = new Instances(getInputFormat().relationName(), newAtts, 0);
- outputFormat.setClassIndex(newClassIndex);
- setOutputFormat(outputFormat);
- }
- /**
- * Convert a single instance over. The converted instance is
- * added to the end of the output queue.
- *
- * @param instance the instance to convert
- */
- private void convertInstance(Instance instance) {
- Instance inst = null;
- if (instance instanceof SparseInstance) {
- double[] vals = new double[instance.numValues()];
- int[] newIndices = new int[instance.numValues()];
- for (int j = 0; j < instance.numValues(); j++) {
- Attribute att = getInputFormat().attribute(instance.index(j));
- if ((!att.isNumeric()) || (instance.index(j) == getInputFormat().classIndex())) {
- vals[j] = instance.valueSparse(j);
- } else {
- if (instance.isMissingSparse(j)) {
- vals[j] = instance.valueSparse(j);
- } else {
- vals[j] = 1;
- }
- }
- newIndices[j] = instance.index(j);
- }
- inst = new SparseInstance(instance.weight(), vals, newIndices,
- outputFormatPeek().numAttributes());
- } else {
- double[] vals = new double[outputFormatPeek().numAttributes()];
- for (int j = 0; j < getInputFormat().numAttributes(); j++) {
- Attribute att = getInputFormat().attribute(j);
- if ((!att.isNumeric()) || (j == getInputFormat().classIndex())) {
- vals[j] = instance.value(j);
- } else {
- if (instance.isMissing(j) || (instance.value(j) == 0)) {
- vals[j] = instance.value(j);
- } else {
- vals[j] = 1;
- }
- }
- }
- inst = new Instance(instance.weight(), vals);
- }
- inst.setDataset(instance.dataset());
- push(inst);
- }
- /**
- * 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 NumericToBinary(), argv);
- } else {
- Filter.filterFile(new NumericToBinary(), argv);
- }
- } catch (Exception ex) {
- System.out.println(ex.getMessage());
- }
- }
- }