public FisherFaceRecognizer(List <Matrix> trainingSet, List <String> labels, int numOfComponents)
{
int n = trainingSet.Count; // sample size
HashSet <String> tempSet = new HashSet <String>(labels);
int c = tempSet.Count; // class size
// process in PCA
EigenFaceRecognizer pca = new EigenFaceRecognizer(trainingSet, labels, numOfComponents);
//construct the nearest neighbor graph
Matrix S = constructNearestNeighborGraph(pca.getProjectSet());
Matrix D = constructD(S);
Matrix L = D.Subtract(S);
//reconstruct the trainingSet into required X;
Matrix X = constructTrainingMatrix(pca.getProjectSet());
Matrix XLXT = X.Multiply(L).Multiply(X.Transpose());
Matrix XDXT = X.Multiply(D).Multiply(X.Transpose());
//calculate the eignevalues and eigenvectors of (XDXT)^-1 * (XLXT)
Matrix targetForEigen = XDXT.Inverse().Multiply(XLXT);
EigenvalueDecomposition feature = targetForEigen.Eigen();
double[] d = feature.RealEigenvalues;
//assert d.length >= c - 1 :"Ensure that the number of eigenvalues is larger than c - 1";///
int[] indexes = getIndOfHigherEV(d, d.Length);
Matrix eigenVectors = feature.GetV();
Matrix selectedEigenVectors = eigenVectors.GetMatrix(0, eigenVectors.RowDimension - 1, indexes);
this.weightMatrix = pca.getWeightMatrix().Multiply(selectedEigenVectors);
//Construct projectedTrainingMatrix
this.projectSet = new List <ProjectMatrix>();
for (int i = 0; i < trainingSet.Count(); i++)
{
ProjectMatrix ptm = new ProjectMatrix(this.weightMatrix.Transpose().Multiply(trainingSet[i].Subtract(pca.getMeanMatrix())), labels[i]);
this.projectSet.Add(ptm);
}
this.meanMatrix = pca.getMeanMatrix();
}
public LDA(List <Matrix> trainingSet, List <String> labels,
int numOfComponents)
{
int n = trainingSet.Count(); // sample size
HashSet <string> tempSet = new HashSet <string>(labels);
int c = tempSet.Count(); // class size
/// deh mfrod used for debugging issues, so fakes for nw //////////////////////////
//assert numOfComponents >= n - c : "the input components is smaller than n - c!";
//assert n >= 2 * c : "n is smaller than 2c!";
// process in PCA
EigenFaceRecognizer pca = new EigenFaceRecognizer(trainingSet, labels, n - c);
// classify
Matrix meanTotal = new Matrix(n - c, 1);
Dictionary <string, List <Matrix> > map = new Dictionary <string, List <Matrix> >();
List <ProjectMatrix> pcaTrain = pca.getProjectSet();
for (int i = 0; i < pcaTrain.Count(); i++)
{
string key = pcaTrain[i].getLabel();
meanTotal.AddEquals(pcaTrain[i].getImgMat());
if (!map.ContainsKey(key))
{
List <Matrix> temp = new List <Matrix>();
temp.Add(pcaTrain[i].getImgMat());
map.Add(key, temp);
}
else
{
List <Matrix> temp = map[key];
temp.Add(pcaTrain[i].getImgMat());
map[key] = temp;
}
}
meanTotal.Multiply((double)1 / n);
// calculate Sw, Sb
Matrix Sw = new Matrix(n - c, n - c);
Matrix Sb = new Matrix(n - c, n - c);
/*** !!! **/
tempSet = new HashSet <string>(map.Keys);
/*** !!! **/
foreach (string s in tempSet)
{
//iterator<string> it = tempSet.iterator();
//while (it.hasNext()) {
//String s = (String)it.next();
List <Matrix> matrixWithinThatClass = map[s];
Matrix meanOfCurrentClass = getMean(matrixWithinThatClass);
for (int i = 0; i < matrixWithinThatClass.Count(); i++)
{
Matrix temp1 = matrixWithinThatClass[i].Subtract(meanOfCurrentClass);
temp1 = temp1.Multiply(temp1.Transpose());
Sw.AddEquals(temp1);
}
Matrix temp = meanOfCurrentClass.Subtract(meanTotal);
temp = temp.Multiply(temp.Transpose()).Multiply(matrixWithinThatClass.Count());
Sb.AddEquals(temp);
}
// calculate the eigenvalues and vectors of Sw^-1 * Sb
Matrix targetForEigen = Sw.Inverse().Multiply(Sb);
EigenvalueDecomposition feature = targetForEigen.Eigen();
double[] d = feature.RealEigenvalues;
//assert d.length >= c - 1 : "Ensure that the number of eigenvalues is larger than c - 1";
int[] indexes = getIndOfHigherEV(d, c - 1);
Matrix eigenVectors = feature.GetV();
Matrix selectedEigenVectors = eigenVectors.GetMatrix(0, eigenVectors.RowDimension - 1, indexes);
this.weightMatrix = pca.getWeightMatrix().Multiply(selectedEigenVectors);
// Construct projectedTrainingMatrix
this.projectSet = new List <ProjectMatrix>();
for (int i = 0; i < trainingSet.Count(); i++)
{
ProjectMatrix ptm = new ProjectMatrix(this.weightMatrix
.Transpose()
.Multiply(trainingSet[i].Subtract(pca.getMeanMatrix())),
labels[i]);
this.projectSet.Add(ptm);
}
this.meanMatrix = pca.getMeanMatrix();
}
