public void ComputeTest2()
{
Accord.Math.Tools.SetupGenerator(0);
double[,] S = Matrix.Random(5000, 2);
double[,] A =
{
{ 1, 1 },
{ -1, 3 },
};
A = A.Divide(Norm.Norm1(A));
double[,] X = S.Multiply(A);
IndependentComponentAnalysis ica = new IndependentComponentAnalysis(X, IndependentComponentAlgorithm.Deflation);
Assert.AreEqual(IndependentComponentAlgorithm.Deflation, ica.Algorithm);
ica.Compute(2);
var result = ica.Result;
var mixingMatrix = ica.MixingMatrix;
var revertMatrix = ica.DemixingMatrix;
// Verify mixing matrix
mixingMatrix = mixingMatrix.Divide(Norm.Norm1(mixingMatrix));
Assert.IsTrue(A.IsEqual(mixingMatrix, 0.05));
// Verify demixing matrix
double[,] expected =
{
{ 3, -1 },
{ 1, 1 },
};
expected = expected.Divide(Norm.Norm1(expected));
revertMatrix = revertMatrix.Divide(Norm.Norm1(revertMatrix));
Assert.IsTrue(expected.IsEqual(revertMatrix, 0.05));
var reverted = Accord.Statistics.Tools.ZScores(result).Abs();
var original = Accord.Statistics.Tools.ZScores(S).Abs();
Assert.IsTrue(reverted.IsEqual(original, 0.1));
}
public void Norm1Test()
{
double[,] a =
{
{ 2, 1, 5 },
{ 2, 2, 2 },
{ 1, 6, 4 }
};
double expected = 11;
double actual = Norm.Norm1(a);
Assert.AreEqual(expected, actual);
}
