moa.clusterers.CobWeb Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of moa Show documentation
Show all versions of moa Show documentation
Massive On-line Analysis is an environment for massive data mining. MOA
provides a framework for data stream mining and includes tools for evaluation
and a collection of machine learning algorithms. Related to the WEKA project,
also written in Java, while scaling to more demanding problems.
/*
* CobWeb.java
* Copyright (C) 2009 University of Waikato, Hamilton, New Zealand
* @author Mark Hall ([email protected])
*
* 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 CNode instance.
*
* @param numAttributes the number of attributes in the data
*/
public CNode(int numAttributes) {
m_numAttributes = numAttributes;
}
/**
* Creates a new leaf CNode instance.
*
* @param numAttributes the number of attributes in the data
* @param leafInstance the instance to store at this leaf
*/
public CNode(int numAttributes, Instance leafInstance) {
this(numAttributes);
if (m_clusterInstances == null) {
//System.out.println(leafInstance.numAttributes()+"-"+leafInstance.value(0)+"-"+leafInstance.value(1)+"-"+leafInstance.value(2));
//System.out.println(leafInstance.numAttributes()+"-"+leafInstance.attribute(0).type()+"-"+leafInstance.attribute(1).type()+"-"+leafInstance.attribute(2).type());
m_clusterInstances = new Instances(leafInstance.dataset(), 1);
}
m_clusterInstances.add(leafInstance);
updateStats(leafInstance, false);
}
/**
* Adds an instance to this cluster.
*
* @param newInstance the instance to add
*/
protected void addInstance(Instance newInstance) {
// Add the instance to this cluster
if (m_clusterInstances == null) {
m_clusterInstances = new Instances(newInstance.dataset(), 1);
m_clusterInstances.add(newInstance);
updateStats(newInstance, false);
return;
} else if (m_children == null) {
/* we are a leaf, so make our existing instance(s) into a child
and then add the new instance as a child */
m_children = new FastVector();
CNode tempSubCluster = new CNode(m_numAttributes,
m_clusterInstances.instance(0));
// System.out.println("Dumping "+m_clusterInstances.numInstances());
for (int i = 1; i < m_clusterInstances.numInstances(); i++) {
tempSubCluster.m_clusterInstances.add(m_clusterInstances.instance(i));
tempSubCluster.updateStats(m_clusterInstances.instance(i), false);
}
m_children = new FastVector();
m_children.addElement(tempSubCluster);
m_children.addElement(new CNode(m_numAttributes, newInstance));
m_clusterInstances.add(newInstance);
updateStats(newInstance, false);
// here is where we check against cutoff (also check cutoff
// in findHost)
if (categoryUtility() < m_cutoff) {
// System.out.println("Cutting (leaf add) ");
m_children = null;
}
return;
}
// otherwise, find the best host for this instance
CNode bestHost = findHost(newInstance, false);
if (bestHost != null) {
// now add to the best host
bestHost.addInstance(newInstance);
}
}
/**
* Temporarily adds a new instance to each of this nodes children
* in turn and computes the category utility.
*
* @param newInstance the new instance to evaluate
* @return an array of category utility values---the result of considering
* each child in turn as a host for the new instance
* @throws Exception if an error occurs
*/
private double[] cuScoresForChildren(Instance newInstance) {
//throws Exception {
// look for a host in existing children
double[] categoryUtils = new double[m_children.size()];
// look for a home for this instance in the existing children
for (int i = 0; i < m_children.size(); i++) {
CNode temp = (CNode) m_children.elementAt(i);
// tentitively add the new instance to this child
temp.updateStats(newInstance, false);
categoryUtils[i] = categoryUtility();
// remove the new instance from this child
temp.updateStats(newInstance, true);
}
return categoryUtils;
}
private double cuScoreForBestTwoMerged(CNode merged,
CNode a, CNode b,
Instance newInstance) {//throws Exception {
double mergedCU = -Double.MAX_VALUE;
// consider merging the best and second
// best.
merged.m_clusterInstances = new Instances(m_clusterInstances, 1);
merged.addChildNode(a);
merged.addChildNode(b);
merged.updateStats(newInstance, false); // add new instance to stats
// remove the best and second best nodes
m_children.removeElementAt(m_children.indexOf(a));
m_children.removeElementAt(m_children.indexOf(b));
m_children.addElement(merged);
mergedCU = categoryUtility();
// restore the status quo
merged.updateStats(newInstance, true);
m_children.removeElementAt(m_children.indexOf(merged));
m_children.addElement(a);
m_children.addElement(b);
return mergedCU;
}
/**
* Finds a host for the new instance in this nodes children. Also
* considers merging the two best hosts and splitting the best host.
*
* @param newInstance the instance to find a host for
* @param structureFrozen true if the instance is not to be added to
* the tree and instead the best potential host is to be returned
* @return the best host
* @throws Exception if an error occurs
*/
private CNode findHost(Instance newInstance,
boolean structureFrozen) {//throws Exception {
if (!structureFrozen) {
updateStats(newInstance, false);
}
// look for a host in existing children and also consider as a new leaf
double[] categoryUtils = cuScoresForChildren(newInstance);
// make a temporary new leaf for this instance and get CU
CNode newLeaf = new CNode(m_numAttributes, newInstance);
m_children.addElement(newLeaf);
double bestHostCU = categoryUtility();
CNode finalBestHost = newLeaf;
// remove new leaf when seaching for best and second best nodes to
// consider for merging and splitting
m_children.removeElementAt(m_children.size() - 1);
// now determine the best host (and the second best)
int best = 0;
int secondBest = 0;
for (int i = 0; i < categoryUtils.length; i++) {
if (categoryUtils[i] > categoryUtils[secondBest]) {
if (categoryUtils[i] > categoryUtils[best]) {
secondBest = best;
best = i;
} else {
secondBest = i;
}
}
}
CNode a = (CNode) m_children.elementAt(best);
CNode b = (CNode) m_children.elementAt(secondBest);
if (categoryUtils[best] > bestHostCU) {
bestHostCU = categoryUtils[best];
finalBestHost = a;
// System.out.println("Node is best");
}
if (structureFrozen) {
if (finalBestHost == newLeaf) {
return null; // *this* node is the best host
} else {
return finalBestHost;
}
}
double mergedCU = -Double.MAX_VALUE;
CNode merged = new CNode(m_numAttributes);
if (a != b) {
mergedCU = cuScoreForBestTwoMerged(merged, a, b, newInstance);
if (mergedCU > bestHostCU) {
bestHostCU = mergedCU;
finalBestHost = merged;
}
}
// Consider splitting the best
double splitCU = -Double.MAX_VALUE;
double splitBestChildCU = -Double.MAX_VALUE;
double splitPlusNewLeafCU = -Double.MAX_VALUE;
double splitPlusMergeBestTwoCU = -Double.MAX_VALUE;
if (a.m_children != null) {
FastVector tempChildren = new FastVector();
for (int i = 0; i < m_children.size(); i++) {
CNode existingChild = (CNode) m_children.elementAt(i);
if (existingChild != a) {
tempChildren.addElement(existingChild);
}
}
for (int i = 0; i < a.m_children.size(); i++) {
CNode promotedChild = (CNode) a.m_children.elementAt(i);
tempChildren.addElement(promotedChild);
}
// also add the new leaf
tempChildren.addElement(newLeaf);
FastVector saveStatusQuo = m_children;
m_children = tempChildren;
splitPlusNewLeafCU = categoryUtility(); // split + new leaf
// remove the new leaf
tempChildren.removeElementAt(tempChildren.size() - 1);
// now look for best and second best
categoryUtils = cuScoresForChildren(newInstance);
// now determine the best host (and the second best)
best = 0;
secondBest = 0;
for (int i = 0; i < categoryUtils.length; i++) {
if (categoryUtils[i] > categoryUtils[secondBest]) {
if (categoryUtils[i] > categoryUtils[best]) {
secondBest = best;
best = i;
} else {
secondBest = i;
}
}
}
CNode sa = (CNode) m_children.elementAt(best);
CNode sb = (CNode) m_children.elementAt(secondBest);
splitBestChildCU = categoryUtils[best];
// now merge best and second best
CNode mergedSplitChildren = new CNode(m_numAttributes);
if (sa != sb) {
splitPlusMergeBestTwoCU =
cuScoreForBestTwoMerged(mergedSplitChildren, sa, sb, newInstance);
}
splitCU = (splitBestChildCU > splitPlusNewLeafCU)
? splitBestChildCU : splitPlusNewLeafCU;
splitCU = (splitCU > splitPlusMergeBestTwoCU)
? splitCU : splitPlusMergeBestTwoCU;
if (splitCU > bestHostCU) {
bestHostCU = splitCU;
finalBestHost = this;
// tempChildren.removeElementAt(tempChildren.size()-1);
} else {
// restore the status quo
m_children = saveStatusQuo;
}
}
if (finalBestHost != this) {
// can commit the instance to the set of instances at this node
m_clusterInstances.add(newInstance);
} else {
m_numberSplits++;
}
if (finalBestHost == merged) {
m_numberMerges++;
m_children.removeElementAt(m_children.indexOf(a));
m_children.removeElementAt(m_children.indexOf(b));
m_children.addElement(merged);
}
if (finalBestHost == newLeaf) {
finalBestHost = new CNode(m_numAttributes);
m_children.addElement(finalBestHost);
}
if (bestHostCU < m_cutoff) {
if (finalBestHost == this) {
// splitting was the best, but since we are cutting all children
// recursion is aborted and we still need to add the instance
// to the set of instances at this node
m_clusterInstances.add(newInstance);
}
m_children = null;
finalBestHost = null;
}
if (finalBestHost == this) {
// splitting is still the best, so downdate the stats as
// we'll be recursively calling on this node
updateStats(newInstance, true);
}
return finalBestHost;
}
/**
* Adds the supplied node as a child of this node. All of the child's
* instances are added to this nodes instances
*
* @param child the child to add
*/
protected void addChildNode(CNode child) {
for (int i = 0; i < child.m_clusterInstances.numInstances(); i++) {
Instance temp = child.m_clusterInstances.instance(i);
m_clusterInstances.add(temp);
updateStats(temp, false);
}
if (m_children == null) {
m_children = new FastVector();
}
m_children.addElement(child);
}
/**
* Computes the utility of all children with respect to this node
*
* @return the category utility of the children with respect to this node.
* @throws Exception if there are no children
*/
protected double categoryUtility() {// {throws Exception {
// if (m_children == null) {
//throw new Exception("categoryUtility: No children!");
// }
double totalCU = 0;
for (int i = 0; i < m_children.size(); i++) {
CNode child = (CNode) m_children.elementAt(i);
totalCU += categoryUtilityChild(child);
}
totalCU /= (double) m_children.size();
return totalCU;
}
/**
* Computes the utility of a single child with respect to this node
*
* @param child the child for which to compute the utility
* @return the utility of the child with respect to this node
* @throws Exception if something goes wrong
*/
protected double categoryUtilityChild(CNode child) {//throws Exception {
double sum = 0;
for (int i = 0; i < m_numAttributes; i++) {
if (m_clusterInstances.attribute(i).isNominal()) {
for (int j = 0;
j < m_clusterInstances.attribute(i).numValues(); j++) {
double x = child.getProbability(i, j);
double y = getProbability(i, j);
sum += (x * x) - (y * y);
}
} else {
// numeric attribute
sum += ((m_normal / child.getStandardDev(i))
- (m_normal / getStandardDev(i)));
}
}
return (child.m_totalInstances / m_totalInstances) * sum;
}
/**
* Returns the probability of a value of a nominal attribute in this node
*
* @param attIndex the index of the attribute
* @param valueIndex the index of the value of the attribute
* @return the probability
* @throws Exception if the requested attribute is not nominal
*/
protected double getProbability(int attIndex, int valueIndex) {
//throws Exception {
// if (!m_clusterInstances.attribute(attIndex).isNominal()) {
//throw new Exception("getProbability: attribute is not nominal");
// }
if (m_attStats[attIndex].totalCount <= 0) {
return 0;
}
return (double) m_attStats[attIndex].nominalCounts[valueIndex]
/ (double) m_attStats[attIndex].totalCount;
}
/**
* Returns the standard deviation of a numeric attribute
*
* @param attIndex the index of the attribute
* @return the standard deviation
* @throws Exception if an error occurs
*/
protected double getStandardDev(int attIndex) { //throws Exception {
// if (!m_clusterInstances.attribute(attIndex).isNumeric()) {
//throw new Exception("getStandardDev: attribute is not numeric");
// }
m_attStats[attIndex].numericStats.calculateDerived();
double stdDev = m_attStats[attIndex].numericStats.stdDev;
if (Double.isNaN(stdDev) || Double.isInfinite(stdDev)) {
return m_acuity;
}
return Math.max(m_acuity, stdDev);
}
/**
* Update attribute stats using the supplied instance.
*
* @param updateInstance the instance for updating
* @param delete true if the values of the supplied instance are
* to be removed from the statistics
*/
protected void updateStats(Instance updateInstance,
boolean delete) {
if (m_attStats == null) {
m_attStats = new AttributeStats[m_numAttributes];
for (int i = 0; i < m_numAttributes; i++) {
m_attStats[i] = new AttributeStats();
if (m_clusterInstances.attribute(i).isNominal()) {
m_attStats[i].nominalCounts =
new int[m_clusterInstances.attribute(i).numValues()];
} else {
m_attStats[i].numericStats = new Stats();
}
}
}
for (int i = 0; i < m_numAttributes; i++) {
if (!updateInstance.isMissing(i)) {
double value = updateInstance.value(i);
if (m_clusterInstances.attribute(i).isNominal()) {
m_attStats[i].nominalCounts[(int) value] += (delete)
? (-1.0 * updateInstance.weight())
: updateInstance.weight();
m_attStats[i].totalCount += (delete)
? (-1.0 * updateInstance.weight())
: updateInstance.weight();
} else {
if (delete) {
m_attStats[i].numericStats.subtract(value,
updateInstance.weight());
} else {
m_attStats[i].numericStats.add(value, updateInstance.weight());
}
}
}
}
m_totalInstances += (delete)
? (-1.0 * updateInstance.weight())
: (updateInstance.weight());
}
/**
* Recursively assigns numbers to the nodes in the tree.
*
* @param cl_num an int[] value
* @throws Exception if an error occurs
*/
private void assignClusterNums(int[] cl_num) { //throws Exception {
// if (m_children != null && m_children.size() < 2) {
//throw new Exception("assignClusterNums: tree not built correctly!");
// }
m_clusterNum = cl_num[0];
cl_num[0]++;
if (m_children != null) {
for (int i = 0; i < m_children.size(); i++) {
CNode child = (CNode) m_children.elementAt(i);
child.assignClusterNums(cl_num);
}
}
}
/**
* Recursively build a string representation of the Cobweb tree
*
* @param depth depth of this node in the tree
* @param text holds the string representation
*/
protected void dumpTree(int depth, StringBuffer text) {
if (depth == 0) {
determineNumberOfClusters();
}
if (m_children == null) {
text.append("\n");
for (int j = 0; j < depth; j++) {
text.append("| ");
}
text.append("leaf " + m_clusterNum + " ["
+ m_clusterInstances.numInstances() + "]");
} else {
for (int i = 0; i < m_children.size(); i++) {
text.append("\n");
for (int j = 0; j < depth; j++) {
text.append("| ");
}
text.append("node " + m_clusterNum + " ["
+ m_clusterInstances.numInstances()
+ "]");
((CNode) m_children.elementAt(i)).dumpTree(depth + 1, text);
}
}
}
/**
* Returns the instances at this node as a string. Appends the cluster
* number of the child that each instance belongs to.
*
* @return a String value
* @throws Exception if an error occurs
*/
protected String dumpData() { //throws Exception {
if (m_children == null) {
return m_clusterInstances.toString();
}
// construct instances string with cluster numbers attached
CNode tempNode = new CNode(m_numAttributes);
tempNode.m_clusterInstances = new Instances(m_clusterInstances, 1);
for (int i = 0; i < m_children.size(); i++) {
tempNode.addChildNode((CNode) m_children.elementAt(i));
}
Instances tempInst = tempNode.m_clusterInstances;
tempNode = null;
Add af = new Add();
af.setAttributeName("Cluster");
String labels = "";
for (int i = 0; i < m_children.size(); i++) {
CNode temp = (CNode) m_children.elementAt(i);
labels += ("C" + temp.m_clusterNum);
if (i < m_children.size() - 1) {
labels += ",";
}
}
af.setNominalLabels(labels);
//af.setInputFormat(tempInst);
//tempInst = Filter.useFilter(tempInst, af);
tempInst.setRelationName("Cluster " + m_clusterNum);
int z = 0;
for (int i = 0; i < m_children.size(); i++) {
CNode temp = (CNode) m_children.elementAt(i);
for (int j = 0; j < temp.m_clusterInstances.numInstances(); j++) {
tempInst.instance(z).setValue(m_numAttributes, (double) i);
z++;
}
}
return tempInst.toString();
}
/**
* Recursively generate the graph string for the Cobweb tree.
*
* @param text holds the graph string
* @throws Exception if generation fails
*/
protected void graphTree(StringBuffer text) { //throws Exception {
text.append("N" + m_clusterNum
+ " [label=\"" + ((m_children == null)
? "leaf " : "node ")
+ m_clusterNum + " "
+ " (" + m_clusterInstances.numInstances()
+ ")\" "
+ ((m_children == null)
? "shape=box style=filled " : "")
+ (m_saveInstances
? "data =\n" + dumpData() + "\n,\n"
: "")
+ "]\n");
if (m_children != null) {
for (int i = 0; i < m_children.size(); i++) {
CNode temp = (CNode) m_children.elementAt(i);
text.append("N" + m_clusterNum
+ "->"
+ "N" + temp.m_clusterNum
+ "\n");
}
for (int i = 0; i < m_children.size(); i++) {
CNode temp = (CNode) m_children.elementAt(i);
temp.graphTree(text);
}
}
}
/**
* Recursively build a clustering representation of the Cobweb tree
*
* @param depth depth of this node in the tree
* @param clustering holds the Clustering representation
*/
protected void computeTreeClustering(int depth, Clustering clustering) {
if (depth == 0) {
determineNumberOfClusters();
}
if (m_children == null) {
//Append Cluster
/*text.append("\n");
for (int j = 0; j < depth; j++) {
text.append("| ");
}
text.append("leaf " + m_clusterNum + " ["
+ m_clusterInstances.numInstances() + "]");
clustering.add(SphereCluster(this.coordinates, .05, m_clusterInstances.numInstances()));*/
if (depth == 0) {
double [] centroidCoordinates = new double[m_clusterInstances.numAttributes()];
for (int j = 0; j < m_clusterInstances.numAttributes()-1; j++) {
centroidCoordinates[j] = m_clusterInstances.meanOrMode(j);
}
clustering.add(new SphereCluster(centroidCoordinates, .05, m_clusterInstances.numInstances()));
}
} else {
for (int i = 0; i < m_children.size(); i++) {
/*text.append("\n");
for (int j = 0; j < depth; j++) {
text.append("| ");
}
text.append("node " + m_clusterNum + " ["
+ m_clusterInstances.numInstances()
+ "]");*/
double [] centroidCoordinates = new double[m_clusterInstances.numAttributes()];
for (int j = 0; j < m_clusterInstances.numAttributes()-1; j++) {
centroidCoordinates[j] = m_clusterInstances.meanOrMode(j);
}
clustering.add(new SphereCluster(centroidCoordinates, .05, m_clusterInstances.numInstances()));
((CNode) m_children.elementAt(i)).computeTreeClustering(depth + 1, clustering);
}
}
}
}
/**
* Normal constant.
*/
protected static final double m_normal = 1.0 / (2 * Math.sqrt(Math.PI));
/**
* Acuity (minimum standard deviation).
*/
protected double m_acuity = 1.0;
/**
* Cutoff (minimum category utility).
*/
protected double m_cutoff = 0.002;//0.01 * Cobweb.m_normal;
/**
* Holds the root of the Cobweb tree.
*/
protected CNode m_cobwebTree = null;
/**
* Number of clusters (nodes in the tree). Must never be queried directly,
* only via the method numberOfClusters(). Otherwise it's not guaranteed that
* it contains the correct value.
*
* @see #numberOfClusters()
* @see #m_numberOfClustersDetermined
*/
protected int m_numberOfClusters = -1;
/** whether the number of clusters was already determined */
protected boolean m_numberOfClustersDetermined = false;
/** the number of splits that happened */
protected int m_numberSplits;
/** the number of merges that happened */
protected int m_numberMerges;
/**
* Output instances in graph representation of Cobweb tree (Allows
* instances at nodes in the tree to be visualized in the Explorer).
*/
protected boolean m_saveInstances = false;
@SuppressWarnings("hiding")
public static final String classifierPurposeString = "Cobweb and Classit clustering algorithms: it always compares the best host, adding a new leaf, merging the two best hosts, and splitting the best host when considering where to place a new instance..";
@Override
public void resetLearningImpl() {
setAcuity(this.acuityOption.getValue());
setCutoff(this.cutoffOption.getValue());
m_numberOfClusters = -1;
m_cobwebTree = null;
m_numberSplits = 0;
m_numberMerges = 0;
}
/**
* Adds an instance to the clusterer.
*
* @param newInstance the instance to be added
* @throws Exception if something goes wrong
*/
// public void updateClusterer(Instance newInstance) throws Exception {
@Override
public void trainOnInstanceImpl(Instance newInstance) { //throws Exception {
m_numberOfClustersDetermined = false;
if (m_cobwebTree == null) {
m_cobwebTree = new CNode(newInstance.numAttributes(), newInstance);
} else {
m_cobwebTree.addInstance(newInstance);
}
}
/**
* Classifies a given instance.
*
* @param instance the instance to be assigned to a cluster
* @return the number of the assigned cluster as an interger
* if the class is enumerated, otherwise the predicted value
* @throws Exception if instance could not be classified
* successfully
*/
public double[] getVotesForInstance(Instance instance) {
//public int clusterInstance(Instance instance) {//throws Exception {
CNode host = m_cobwebTree;
CNode temp = null;
determineNumberOfClusters();
if (this.m_numberOfClusters < 1) {
return (new double[0]);
}
double[] ret = new double[this.m_numberOfClusters];
do {
if (host.m_children == null) {
temp = null;
break;
}
host.updateStats(instance, false);
temp = host.findHost(instance, true);
host.updateStats(instance, true);
if (temp != null) {
host = temp;
}
} while (temp != null);
ret[host.m_clusterNum] = 1.0;
return ret;
}
/**
* determines the number of clusters if necessary
*
* @see #m_numberOfClusters
* @see #m_numberOfClustersDetermined
*/
protected void determineNumberOfClusters() {
if (!m_numberOfClustersDetermined
&& (m_cobwebTree != null)) {
int[] numClusts = new int[1];
numClusts[0] = 0;
// try {
m_cobwebTree.assignClusterNums(numClusts);
// }
// catch (Exception e) {
// e.printStackTrace();
// numClusts[0] = 0;
// }
m_numberOfClusters = numClusts[0];
m_numberOfClustersDetermined = true;
}
}
/**
* Returns the number of clusters.
*
* @return the number of clusters
*/
public int numberOfClusters() {
determineNumberOfClusters();
return m_numberOfClusters;
}
{
// return this.observedClassDistribution.getArrayCopy();
}
@Override
protected Measurement[] getModelMeasurementsImpl() {
return null;
}
@Override
public void getModelDescription(StringBuilder out, int indent) {
StringBuffer text = new StringBuffer();
if (m_cobwebTree == null) {
StringUtils.appendIndented(out, indent, "Cobweb hasn't been built yet!");
StringUtils.appendNewline(out);
} else {
m_cobwebTree.dumpTree(0, text);
StringUtils.appendIndented(out, indent, "CobWeb - ");
out.append("Number of merges: "
+ m_numberMerges + "\nNumber of splits: "
+ m_numberSplits + "\nNumber of clusters: "
+ numberOfClusters() + "\n" + text.toString());
StringUtils.appendNewline(out);
}
}
public boolean isRandomizable() {
return false;
}
/**
* Generates the graph string of the Cobweb tree
*
* @return a String value
* @throws Exception if an error occurs
*/
public String graph() {// throws Exception {
StringBuffer text = new StringBuffer();
text.append("digraph CobwebTree {\n");
m_cobwebTree.graphTree(text);
text.append("}\n");
return text.toString();
}
/**
* set the acuity.
* @param a the acuity value
*/
public void setAcuity(double a) {
m_acuity = a;
}
/**
* get the acuity value
* @return the acuity
*/
public double getAcuity() {
return m_acuity;
}
/**
* set the cutoff
* @param c the cutof
*/
public void setCutoff(double c) {
m_cutoff = c;
}
/**
* get the cutoff
* @return the cutoff
*/
public double getCutoff() {
return m_cutoff;
}
/**
* Get the value of saveInstances.
*
* @return Value of saveInstances.
*/
public boolean getSaveInstanceData() {
return m_saveInstances;
}
/**
* Set the value of saveInstances.
*
* @param newsaveInstances Value to assign to saveInstances.
*/
public void setSaveInstanceData(boolean newsaveInstances) {
m_saveInstances = newsaveInstances;
}
public Clustering getClusteringResult() {
//throw new UnsupportedOperationException("Not supported yet.");
Clustering result = new Clustering();
if (m_cobwebTree == null) {
//StringUtils.appendIndented(out, indent, "Cobweb hasn't been built yet!");
//StringUtils.appendNewline(out);
} else {
m_cobwebTree.computeTreeClustering(0,result);
System.out.println("After Number of clusters: "+numberOfClusters() );
}
System.out.println("Number of clusters: "+result.size());
return result;
}
}
© 2015 - 2025 Weber Informatics LLC | Privacy Policy