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The Waikato Environment for Knowledge Analysis (WEKA), a machine
learning workbench. This is the stable version. Apart from bugfixes, this version
does not receive any other updates.
/*
* 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
* -O <file name>
* The filename where output will be stored. Use - for stdout.
* (default temp file)
*
*
*
*
* @author Len Trigg ([email protected])
* @version $Revision: 10203 $
*/
public class InstancesResultListener extends CSVResultListener {
/** for serialization */
static final long serialVersionUID = -2203808461809311178L;
/** Stores the instances created so far, before assigning to a header */
protected transient ArrayList m_Instances;
/** Stores the attribute types for each column */
protected transient int[] m_AttributeTypes;
/** For lookup of indices given a string value for each nominal attribute */
protected transient Hashtable[] m_NominalIndexes;
/** Contains strings seen so far for each nominal attribute */
protected transient ArrayList[] m_NominalStrings;
/**
* Sets temporary file.
*/
public InstancesResultListener() {
File resultsFile;
try {
resultsFile = File.createTempFile("weka_experiment", ".arff");
resultsFile.deleteOnExit();
} catch (Exception e) {
System.err.println("Cannot create temp file, writing to standard out.");
resultsFile = new File("-");
}
setOutputFile(resultsFile);
setOutputFileName("");
}
/**
* Returns a string describing this result listener
*
* @return a description of the result listener suitable for displaying in the
* explorer/experimenter gui
*/
@Override
public String globalInfo() {
return "Outputs the received results in arff format to "
+ "a Writer. All results must be received before the instances can be "
+ "written out.";
}
/**
* Prepare for the results to be received.
*
* @param rp the ResultProducer that will generate the results
* @exception Exception if an error occurs during preprocessing.
*/
@SuppressWarnings("unchecked")
@Override
public void preProcess(ResultProducer rp) throws Exception {
m_RP = rp;
if ((m_OutputFile == null) || (m_OutputFile.getName().equals("-"))) {
m_Out = new PrintWriter(System.out, true);
} else {
m_Out = new PrintWriter(new BufferedOutputStream(new FileOutputStream(
m_OutputFile)), true);
}
Object[] keyTypes = m_RP.getKeyTypes();
Object[] resultTypes = m_RP.getResultTypes();
m_AttributeTypes = new int[keyTypes.length + resultTypes.length];
m_NominalIndexes = new Hashtable[m_AttributeTypes.length];
m_NominalStrings = new ArrayList[m_AttributeTypes.length];
m_Instances = new ArrayList();
for (int i = 0; i < m_AttributeTypes.length; i++) {
Object attribute = null;
if (i < keyTypes.length) {
attribute = keyTypes[i];
} else {
attribute = resultTypes[i - keyTypes.length];
}
if (attribute instanceof String) {
m_AttributeTypes[i] = Attribute.NOMINAL;
m_NominalIndexes[i] = new Hashtable();
m_NominalStrings[i] = new ArrayList();
} else if (attribute instanceof Double) {
m_AttributeTypes[i] = Attribute.NUMERIC;
} else {
throw new Exception("Unknown attribute type in column " + (i + 1));
}
}
}
/**
* Perform any postprocessing. When this method is called, it indicates that
* no more results will be sent that need to be grouped together in any way.
*
* @param rp the ResultProducer that generated the results
* @exception Exception if an error occurs
*/
@Override
public void postProcess(ResultProducer rp) throws Exception {
if (m_RP != rp) {
throw new Error("Unrecognized ResultProducer sending results!!");
}
String[] keyNames = m_RP.getKeyNames();
String[] resultNames = m_RP.getResultNames();
ArrayList attribInfo = new ArrayList();
for (int i = 0; i < m_AttributeTypes.length; i++) {
String attribName = "Unknown";
if (i < keyNames.length) {
attribName = "Key_" + keyNames[i];
} else {
attribName = resultNames[i - keyNames.length];
}
switch (m_AttributeTypes[i]) {
case Attribute.NOMINAL:
if (m_NominalStrings[i].size() > 0) {
attribInfo.add(new Attribute(attribName, m_NominalStrings[i]));
} else {
attribInfo.add(new Attribute(attribName, (ArrayList) null));
}
break;
case Attribute.NUMERIC:
attribInfo.add(new Attribute(attribName));
break;
case Attribute.STRING:
attribInfo.add(new Attribute(attribName, (ArrayList) null));
break;
default:
throw new Exception("Unknown attribute type");
}
}
Instances result = new Instances("InstanceResultListener", attribInfo,
m_Instances.size());
for (int i = 0; i < m_Instances.size(); i++) {
result.add(m_Instances.get(i));
}
m_Out.println(new Instances(result, 0));
for (int i = 0; i < result.numInstances(); i++) {
m_Out.println(result.instance(i));
}
if (!(m_OutputFile == null) && !(m_OutputFile.getName().equals("-"))) {
m_Out.close();
}
}
/**
* Collects each instance and adjusts the header information.
*
* @param rp the ResultProducer that generated the result
* @param key The key for the results.
* @param result The actual results.
* @exception Exception if the result could not be accepted.
*/
@Override
public void acceptResult(ResultProducer rp, Object[] key, Object[] result)
throws Exception {
if (m_RP != rp) {
throw new Error("Unrecognized ResultProducer sending results!!");
}
Instance newInst = new DenseInstance(m_AttributeTypes.length);
for (int i = 0; i < m_AttributeTypes.length; i++) {
Object val = null;
if (i < key.length) {
val = key[i];
} else {
val = result[i - key.length];
}
if (val == null) {
newInst.setValue(i, Utils.missingValue());
} else {
switch (m_AttributeTypes[i]) {
case Attribute.NOMINAL:
String str = (String) val;
Double index = m_NominalIndexes[i].get(str);
if (index == null) {
index = new Double(m_NominalStrings[i].size());
m_NominalIndexes[i].put(str, index);
m_NominalStrings[i].add(str);
}
newInst.setValue(i, index.doubleValue());
break;
case Attribute.NUMERIC:
double dou = ((Double) val).doubleValue();
newInst.setValue(i, dou);
break;
default:
newInst.setValue(i, Utils.missingValue());
}
}
}
m_Instances.add(newInst);
}
/**
* Returns the revision string.
*
* @return the revision
*/
@Override
public String getRevision() {
return RevisionUtils.extract("$Revision: 10203 $");
}
} // InstancesResultListener