@Override
public double[][] getKernelMatrix(List<TrainingSample<T>> list) {
final List<TrainingSample<T>> l = list;
// init matrix with ones
double matrix[][] = new double[l.size()][l.size()];
for (double[] lines : matrix) Arrays.fill(lines, 1.);
for (final GaussianKernel<T> k : kernels.keySet()) {
final double w = kernels.get(k);
// check w
if (w == 0) continue;
k.setGamma(w);
final double[][] m = k.getKernelMatrix(l);
// specific factory
ThreadedMatrixOperator tmo =
new ThreadedMatrixOperator() {
@Override
public void doLines(double[][] matrix, int from, int to) {
for (int index = from; index < to; index++) {
for (int i = 0; i < m[index].length; i++) {
matrix[index][i] *= m[index][i];
}
}
};
};
matrix = tmo.getMatrix(matrix);
}
return matrix;
}
@Override
public double valueOf(T t1, T t2) {
double sum = 1.;
for (GaussianKernel<T> k : kernels.keySet()) {
double w = kernels.get(k);
if (w != 0) {
k.setGamma(w);
sum *= k.valueOf(t1, t2);
}
}
return sum;
}