List of usage examples for weka.classifiers.rules DecisionTableHashKey DecisionTableHashKey
public DecisionTableHashKey(Instance t, int numAtts, boolean ignoreClass) throws Exception
From source file:org.isep.simizer.example.policy.utils.IterativeSimpleKMeans.java
License:Open Source License
/** * Generates a clusterer. Has to initialize all fields of the clusterer that * are not being set via options./*from w w w.jav a2s .co m*/ * * @param data set of instances serving as training data * @throws Exception if the clusterer has not been generated successfully */ public void buildClusterer(Instances data) throws Exception { // can clusterer handle the data? getCapabilities().testWithFail(data); m_Iterations = 0; m_ReplaceMissingFilter = new ReplaceMissingValues(); Instances instances = new Instances(data); instances.setClassIndex(-1); if (!m_dontReplaceMissing) { m_ReplaceMissingFilter.setInputFormat(instances); instances = Filter.useFilter(instances, m_ReplaceMissingFilter); } m_FullMissingCounts = new int[instances.numAttributes()]; if (m_displayStdDevs) { m_FullStdDevs = new double[instances.numAttributes()]; } m_FullNominalCounts = new int[instances.numAttributes()][0]; m_FullMeansOrMediansOrModes = moveCentroid(0, instances, false); for (int i = 0; i < instances.numAttributes(); i++) { m_FullMissingCounts[i] = instances.attributeStats(i).missingCount; if (instances.attribute(i).isNumeric()) { if (m_displayStdDevs) { m_FullStdDevs[i] = Math.sqrt(instances.variance(i)); } if (m_FullMissingCounts[i] == instances.numInstances()) { m_FullMeansOrMediansOrModes[i] = Double.NaN; // mark missing as mean } } else { m_FullNominalCounts[i] = instances.attributeStats(i).nominalCounts; if (m_FullMissingCounts[i] > m_FullNominalCounts[i][Utils.maxIndex(m_FullNominalCounts[i])]) { m_FullMeansOrMediansOrModes[i] = -1; // mark missing as most common value } } } // Modified to account for already set centroids if (m_ClusterCentroids == null) { m_ClusterCentroids = new Instances(instances, m_NumClusters); } int[] clusterAssignments = new int[instances.numInstances()]; if (m_PreserveOrder) { m_Assignments = clusterAssignments; } m_DistanceFunction.setInstances(instances); Random RandomO = new Random(getSeed()); int instIndex; HashMap initC = new HashMap(); DecisionTableHashKey hk = null; Instances initInstances = null; if (m_PreserveOrder) { initInstances = new Instances(instances); } else { initInstances = instances; } // Modified to account for already set centroids if (m_ClusterCentroids.numInstances() > 0) { initC = this.centersMap; for (int i = 0; i < m_NumClusters; i++) initInstances.add(m_ClusterCentroids.instance(i)); } else { //part de la fin du Data Set. swappe le centre identifi avec la derniere for (int j = initInstances.numInstances() - 1; j >= 0; j--) { instIndex = RandomO.nextInt(j + 1); hk = new DecisionTableHashKey(initInstances.instance(instIndex), initInstances.numAttributes(), true); if (!initC.containsKey(hk)) { m_ClusterCentroids.add(initInstances.instance(instIndex)); initC.put(hk, null); } initInstances.swap(j, instIndex); if (m_ClusterCentroids.numInstances() == m_NumClusters) { break; } } } m_NumClusters = m_ClusterCentroids.numInstances(); //removing reference initInstances = null; int i; boolean converged = false; int emptyClusterCount; Instances[] tempI = new Instances[m_NumClusters]; m_squaredErrors = new double[m_NumClusters]; m_ClusterNominalCounts = new int[m_NumClusters][instances.numAttributes()][0]; m_ClusterMissingCounts = new int[m_NumClusters][instances.numAttributes()]; while (!converged) { emptyClusterCount = 0; m_Iterations++; converged = true; for (i = 0; i < instances.numInstances(); i++) { Instance toCluster = instances.instance(i); int newC = clusterProcessedInstance(toCluster, true); if (newC != clusterAssignments[i]) { converged = false; } clusterAssignments[i] = newC; } // update centroids m_ClusterCentroids = new Instances(instances, m_NumClusters); for (i = 0; i < m_NumClusters; i++) { tempI[i] = new Instances(instances, 0); } for (i = 0; i < instances.numInstances(); i++) { tempI[clusterAssignments[i]].add(instances.instance(i)); } for (i = 0; i < m_NumClusters; i++) { if (tempI[i].numInstances() == 0) { // empty cluster emptyClusterCount++; } else { moveCentroid(i, tempI[i], true); } } if (m_Iterations == m_MaxIterations) { converged = true; } if (emptyClusterCount > 0) { m_NumClusters -= emptyClusterCount; if (converged) { Instances[] t = new Instances[m_NumClusters]; int index = 0; for (int k = 0; k < tempI.length; k++) { if (tempI[k].numInstances() > 0) { t[index++] = tempI[k]; } } tempI = t; } else { tempI = new Instances[m_NumClusters]; } } if (!converged) { m_squaredErrors = new double[m_NumClusters]; m_ClusterNominalCounts = new int[m_NumClusters][instances.numAttributes()][0]; } } if (m_displayStdDevs) { m_ClusterStdDevs = new Instances(instances, m_NumClusters); } m_ClusterSizes = new int[m_NumClusters]; for (i = 0; i < m_NumClusters; i++) { if (m_displayStdDevs) { double[] vals2 = new double[instances.numAttributes()]; for (int j = 0; j < instances.numAttributes(); j++) { if (instances.attribute(j).isNumeric()) { vals2[j] = Math.sqrt(tempI[i].variance(j)); } else { vals2[j] = Instance.missingValue(); } } m_ClusterStdDevs.add(new Instance(1.0, vals2)); } m_ClusterSizes[i] = tempI[i].numInstances(); } }
From source file:org.isep.simizer.example.policy.utils.IterativeSimpleKMeans.java
License:Open Source License
public void setClusterCentroids(Instances centers) throws Exception { this.centersMap = new HashMap(); this.m_ClusterCentroids = centers; for (int i = 0; i < m_ClusterCentroids.numInstances(); i++) { DecisionTableHashKey hk = new DecisionTableHashKey(m_ClusterCentroids.instance(i), m_ClusterCentroids.numAttributes(), true); if (!centersMap.containsKey(hk)) { centersMap.put(hk, null);//ww w .jav a 2 s .c o m } } }