public static double CA(Instances odata, int[] clusters) {
double result = 0;
double[] tmpdclass = odata.attributeToDoubleArray(odata.numAttributes() - 1);
int[] oclass = new int[odata.numInstances()];
for (int i = 0; i < tmpdclass.length; ++i) {
oclass[i] = (int) tmpdclass[i];
}
int[] tmpclass = oclass.clone();
int[] tmpclusters = clusters.clone();
Arrays.sort(tmpclusters);
Arrays.sort(tmpclass);
int[][] M = new int[tmpclass[tmpclass.length - 1] + 1][tmpclusters[tmpclusters.length - 1] + 1];
for (int i = 0; i < clusters.length; ++i) {
M[oclass[i]][clusters[i]]++;
}
for (int i = 0; i < M.length; ++i) {
System.out.println(Arrays.toString(M[i]));
}
for (int i = 0; i < M.length; ++i) {
int maxindex = -1;
for (int j = 0; j < M[0].length - 1; ++j) {
if (M[i][j] < M[i][j + 1]) maxindex = j + 1;
}
M[i][0] = maxindex;
}
for (int i = 0; i < oclass.length; ++i) {
if (M[oclass[i]][0] == clusters[i]) result++;
}
return (double) result / (double) odata.numInstances();
}
/**
* Calculates the area under the ROC curve as the Wilcoxon-Mann-Whitney statistic.
*
* @param tcurve a previously extracted threshold curve Instances.
* @return the ROC area, or Double.NaN if you don't pass in a ThresholdCurve generated Instances.
*/
public static double getROCArea(Instances tcurve) {
final int n = tcurve.numInstances();
if (!RELATION_NAME.equals(tcurve.relationName()) || (n == 0)) {
return Double.NaN;
}
final int tpInd = tcurve.attribute(TRUE_POS_NAME).index();
final int fpInd = tcurve.attribute(FALSE_POS_NAME).index();
final double[] tpVals = tcurve.attributeToDoubleArray(tpInd);
final double[] fpVals = tcurve.attributeToDoubleArray(fpInd);
double area = 0.0, cumNeg = 0.0;
final double totalPos = tpVals[0];
final double totalNeg = fpVals[0];
for (int i = 0; i < n; i++) {
double cip, cin;
if (i < n - 1) {
cip = tpVals[i] - tpVals[i + 1];
cin = fpVals[i] - fpVals[i + 1];
} else {
cip = tpVals[n - 1];
cin = fpVals[n - 1];
}
area += cip * (cumNeg + (0.5 * cin));
cumNeg += cin;
}
area /= (totalNeg * totalPos);
return area;
}
/**
* Calculates the area under the precision-recall curve (AUPRC).
*
* @param tcurve a previously extracted threshold curve Instances.
* @return the PRC area, or Double.NaN if you don't pass in a ThresholdCurve generated Instances.
*/
public static double getPRCArea(Instances tcurve) {
final int n = tcurve.numInstances();
if (!RELATION_NAME.equals(tcurve.relationName()) || (n == 0)) {
return Double.NaN;
}
final int pInd = tcurve.attribute(PRECISION_NAME).index();
final int rInd = tcurve.attribute(RECALL_NAME).index();
final double[] pVals = tcurve.attributeToDoubleArray(pInd);
final double[] rVals = tcurve.attributeToDoubleArray(rInd);
double area = 0;
double xlast = rVals[n - 1];
// start from the first real p/r pair (not the artificial zero point)
for (int i = n - 2; i >= 0; i--) {
double recallDelta = rVals[i] - xlast;
area += (pVals[i] * recallDelta);
xlast = rVals[i];
}
if (area == 0) {
return Utils.missingValue();
}
return area;
}
/**
* computes the thresholds for outliers and extreme values
*
* @param instances the data to work on
*/
protected void computeThresholds(Instances instances) {
int i;
double[] values;
int[] sortedIndices;
int half;
int quarter;
double q1;
double q2;
double q3;
m_UpperExtremeValue = new double[m_AttributeIndices.length];
m_UpperOutlier = new double[m_AttributeIndices.length];
m_LowerOutlier = new double[m_AttributeIndices.length];
m_LowerExtremeValue = new double[m_AttributeIndices.length];
m_Median = new double[m_AttributeIndices.length];
m_IQR = new double[m_AttributeIndices.length];
for (i = 0; i < m_AttributeIndices.length; i++) {
// non-numeric attribute?
if (m_AttributeIndices[i] == NON_NUMERIC) continue;
// sort attribute data
values = instances.attributeToDoubleArray(m_AttributeIndices[i]);
sortedIndices = Utils.sort(values);
// determine indices
half = sortedIndices.length / 2;
quarter = half / 2;
if (sortedIndices.length % 2 == 1) {
q2 = values[sortedIndices[half]];
} else {
q2 = (values[sortedIndices[half]] + values[sortedIndices[half + 1]]) / 2;
}
if (half % 2 == 1) {
q1 = values[sortedIndices[quarter]];
q3 = values[sortedIndices[sortedIndices.length - quarter - 1]];
} else {
q1 = (values[sortedIndices[quarter]] + values[sortedIndices[quarter + 1]]) / 2;
q3 =
(values[sortedIndices[sortedIndices.length - quarter - 1]]
+ values[sortedIndices[sortedIndices.length - quarter]])
/ 2;
}
// determine thresholds and other values
m_Median[i] = q2;
m_IQR[i] = q3 - q1;
m_UpperExtremeValue[i] = q3 + getExtremeValuesFactor() * m_IQR[i];
m_UpperOutlier[i] = q3 + getOutlierFactor() * m_IQR[i];
m_LowerOutlier[i] = q1 - getOutlierFactor() * m_IQR[i];
m_LowerExtremeValue[i] = q1 - getExtremeValuesFactor() * m_IQR[i];
}
}
/**
* processes the instances using the HAAR algorithm
*
* @param instances the data to process
* @return the modified data
* @throws Exception in case the processing goes wrong
*/
protected Instances processHAAR(Instances instances) throws Exception {
Instances result;
int i;
int n;
int j;
int clsIdx;
double[] oldVal;
double[] newVal;
int level;
int length;
double[] clsVal;
Attribute clsAtt;
clsIdx = instances.classIndex();
clsVal = null;
clsAtt = null;
if (clsIdx > -1) {
clsVal = instances.attributeToDoubleArray(clsIdx);
clsAtt = (Attribute) instances.classAttribute().copy();
instances.setClassIndex(-1);
instances.deleteAttributeAt(clsIdx);
}
result = new Instances(instances, 0);
level = (int) StrictMath.ceil(StrictMath.log(instances.numAttributes()) / StrictMath.log(2.0));
for (i = 0; i < instances.numInstances(); i++) {
oldVal = instances.instance(i).toDoubleArray();
newVal = new double[oldVal.length];
for (n = level; n > 0; n--) {
length = (int) StrictMath.pow(2, n - 1);
for (j = 0; j < length; j++) {
newVal[j] = (oldVal[j * 2] + oldVal[j * 2 + 1]) / StrictMath.sqrt(2);
newVal[j + length] = (oldVal[j * 2] - oldVal[j * 2 + 1]) / StrictMath.sqrt(2);
}
System.arraycopy(newVal, 0, oldVal, 0, newVal.length);
}
// add new transformed instance
result.add(new DenseInstance(1, newVal));
}
// add class again
if (clsIdx > -1) {
result.insertAttributeAt(clsAtt, clsIdx);
result.setClassIndex(clsIdx);
for (i = 0; i < clsVal.length; i++) result.instance(i).setClassValue(clsVal[i]);
}
return result;
}
/**
* Gets the index of the instance with the closest threshold value to the desired target
*
* @param tcurve a set of instances that have been generated by this class
* @param threshold the target threshold
* @return the index of the instance that has threshold closest to the target, or -1 if this could
* not be found (i.e. no data, or bad threshold target)
*/
public static int getThresholdInstance(Instances tcurve, double threshold) {
if (!RELATION_NAME.equals(tcurve.relationName())
|| (tcurve.numInstances() == 0)
|| (threshold < 0)
|| (threshold > 1.0)) {
return -1;
}
if (tcurve.numInstances() == 1) {
return 0;
}
double[] tvals = tcurve.attributeToDoubleArray(tcurve.numAttributes() - 1);
int[] sorted = Utils.sort(tvals);
return binarySearch(sorted, tvals, threshold);
}
/**
* Calculates the n point precision result, which is the precision averaged over n evenly spaced
* (w.r.t recall) samples of the curve.
*
* @param tcurve a previously extracted threshold curve Instances.
* @param n the number of points to average over.
* @return the n-point precision.
*/
public static double getNPointPrecision(Instances tcurve, int n) {
if (!RELATION_NAME.equals(tcurve.relationName()) || (tcurve.numInstances() == 0)) {
return Double.NaN;
}
int recallInd = tcurve.attribute(RECALL_NAME).index();
int precisInd = tcurve.attribute(PRECISION_NAME).index();
double[] recallVals = tcurve.attributeToDoubleArray(recallInd);
int[] sorted = Utils.sort(recallVals);
double isize = 1.0 / (n - 1);
double psum = 0;
for (int i = 0; i < n; i++) {
int pos = binarySearch(sorted, recallVals, i * isize);
double recall = recallVals[sorted[pos]];
double precis = tcurve.instance(sorted[pos]).value(precisInd);
/*
System.err.println("Point " + (i + 1) + ": i=" + pos
+ " r=" + (i * isize)
+ " p'=" + precis
+ " r'=" + recall);
*/
// interpolate figures for non-endpoints
while ((pos != 0) && (pos < sorted.length - 1)) {
pos++;
double recall2 = recallVals[sorted[pos]];
if (recall2 != recall) {
double precis2 = tcurve.instance(sorted[pos]).value(precisInd);
double slope = (precis2 - precis) / (recall2 - recall);
double offset = precis - recall * slope;
precis = isize * i * slope + offset;
/*
System.err.println("Point2 " + (i + 1) + ": i=" + pos
+ " r=" + (i * isize)
+ " p'=" + precis2
+ " r'=" + recall2
+ " p''=" + precis);
*/
break;
}
}
psum += precis;
}
return psum / n;
}
public MethodGenerateClustering(
Instances data,
Instances dataforcluster,
boolean[] labeledIndex,
int ensemblesize,
int Rnd,
int methodind,
double alpha)
throws Exception {
this.alpha = alpha;
this.Rnd = new Random(Rnd);
SquaredError = new double[ensemblesize];
this.data = data;
this.datacluster = new Instances(dataforcluster);
this.labeledIndex = labeledIndex;
this.labeledRelation = labeled2relation(labeledIndex, data).clone();
double[] tmpdclass = data.attributeToDoubleArray(data.numAttributes() - 1);
classes = new int[data.numInstances()];
for (int i = 0; i < tmpdclass.length; ++i) classes[i] = (int) tmpdclass[i];
switch (methodind) {
case 0:
{
this.clustersRes = getMultiKmodesResults(data, dataforcluster, ensemblesize);
break;
}
case 1:
{
this.clustersRes =
getMultiKmodesResultswithRandomSelectFeature(data, dataforcluster, ensemblesize);
break;
}
default:
break;
}
res = getClusterers();
}