  @Test
  public void testGaussianClusterClassification() {

    ClusterClassifier classifier = newGaussianClassifier();
    Vector pdf = classifier.classify(new DenseVector(2));
    assertEquals("[0,0]", "[0.212, 0.576, 0.212]",
        AbstractCluster.formatVector(pdf, null));
    pdf = classifier.classify(new DenseVector(2).assign(2));
    assertEquals("[2,2]", "[0.952, 0.047, 0.000]",
        AbstractCluster.formatVector(pdf, null));
  }