public void GradientTest3()
{
HiddenMarkovClassifier hmm = HiddenMarkovClassifierPotentialFunctionTest.CreateModel1();
var function = new MarkovDiscreteFunction(hmm);
var model = new HiddenConditionalRandomField <int>(function);
var target = new ForwardBackwardGradient <int>(model);
target.Regularization = 2;
FiniteDifferences diff = new FiniteDifferences(function.Weights.Length);
diff.Function = parameters => func(model, parameters, target.Regularization);
double[] expected = diff.Compute(function.Weights);
double[] actual = target.Gradient(function.Weights, inputs, outputs);
for (int i = 0; i < actual.Length; i++)
{
Assert.AreEqual(expected[i], actual[i], 1e-5);
Assert.IsFalse(double.IsNaN(actual[i]));
Assert.IsFalse(double.IsNaN(expected[i]));
}
}
public void RunTest()
{
var inputs = QuasiNewtonHiddenLearningTest.inputs;
var outputs = QuasiNewtonHiddenLearningTest.outputs;
HiddenMarkovClassifier hmm = HiddenMarkovClassifierPotentialFunctionTest.CreateModel1();
var function = new MarkovDiscreteFunction(hmm);
var model = new HiddenConditionalRandomField <int>(function);
var target = new HiddenGradientDescentLearning <int>(model);
target.LearningRate = 1000;
double[] actual = new double[inputs.Length];
double[] expected = new double[inputs.Length];
for (int i = 0; i < inputs.Length; i++)
{
actual[i] = model.Compute(inputs[i]);
expected[i] = outputs[i];
}
for (int i = 0; i < inputs.Length; i++)
{
Assert.AreEqual(expected[i], actual[i]);
}
double ll0 = model.LogLikelihood(inputs, outputs);
double error = Double.NegativeInfinity;
for (int i = 0; i < 50; i++)
{
error = target.RunEpoch(inputs, outputs);
}
double ll1 = model.LogLikelihood(inputs, outputs);
for (int i = 0; i < inputs.Length; i++)
{
actual[i] = model.Compute(inputs[i]);
expected[i] = outputs[i];
}
Assert.AreEqual(-0.00046872579976353634, ll0, 1e-10);
Assert.AreEqual(0.00027018722449589916, error, 1e-10);
Assert.IsFalse(Double.IsNaN(ll0));
Assert.IsFalse(Double.IsNaN(error));
for (int i = 0; i < inputs.Length; i++)
{
Assert.AreEqual(expected[i], actual[i]);
}
Assert.IsTrue(ll1 > ll0);
}
public void HiddenConditionalRandomFieldConstructorTest()
{
HiddenMarkovClassifier hmm = HiddenMarkovClassifierPotentialFunctionTest.CreateModel1();
var function = new MarkovDiscreteFunction(hmm);
var target = new HiddenConditionalRandomField <int>(function);
Assert.AreEqual(function, target.Function);
Assert.AreEqual(2, target.Function.Factors[0].States);
}
public void ComputeTest()
{
var hmm = HiddenMarkovClassifierPotentialFunctionTest.CreateModel1();
IPotentialFunction <int> owner = new MarkovDiscreteFunction(hmm);
int[] x = new int[] { 0, 0, 1, 0, 0, 0, 1, 0, 1, 1, 1, 1, 1, 0 };
foreach (var factor in owner.Factors)
{
for (int y = 0; y < owner.Outputs; y++)
{
double[,] fwd = Accord.Statistics.Models.Fields
.ForwardBackwardAlgorithm.Forward(factor, x, y);
double[,] bwd = Accord.Statistics.Models.Fields
.ForwardBackwardAlgorithm.Backward(factor, x, y);
double[,] lnfwd = Accord.Statistics.Models.Fields
.ForwardBackwardAlgorithm.LogForward(factor, x, y);
double[,] lnbwd = Accord.Statistics.Models.Fields
.ForwardBackwardAlgorithm.LogBackward(factor, x, y);
for (int i = 0; i < fwd.GetLength(0); i++)
{
for (int j = 0; j < fwd.GetLength(1); j++)
{
Assert.AreEqual(System.Math.Log(fwd[i, j]), lnfwd[i, j], 1e-10);
}
}
for (int i = 0; i < bwd.GetLength(0); i++)
{
for (int j = 0; j < bwd.GetLength(1); j++)
{
Assert.AreEqual(System.Math.Log(bwd[i, j]), lnbwd[i, j], 1e-10);
}
}
foreach (var feature in factor)
{
double expected = System.Math.Log(feature.Marginal(fwd, bwd, x, y));
double actual = feature.LogMarginal(lnfwd, lnbwd, x, y);
Assert.AreEqual(expected, actual, 1e-10);
Assert.IsFalse(Double.IsNaN(actual));
}
}
}
}
public void ComputeTest()
{
HiddenMarkovClassifier hmm = HiddenMarkovClassifierPotentialFunctionTest.CreateModel1();
// Declare some testing data
int[][] inputs = new int[][]
{
new int[] { 0, 1, 1, 0 }, // Class 0
new int[] { 0, 0, 1, 0 }, // Class 0
new int[] { 0, 1, 1, 1, 0 }, // Class 0
new int[] { 0, 1, 0 }, // Class 0
new int[] { 1, 0, 0, 1 }, // Class 1
new int[] { 1, 1, 0, 1 }, // Class 1
new int[] { 1, 0, 0, 0, 1 }, // Class 1
new int[] { 1, 0, 1 }, // Class 1
};
int[] outputs = new int[]
{
0, 0, 0, 0, // First four sequences are of class 0
1, 1, 1, 1, // Last four sequences are of class 1
};
var function = new MarkovDiscreteFunction(hmm);
var target = new HiddenConditionalRandomField <int>(function);
for (int i = 0; i < inputs.Length; i++)
{
int expected = hmm.Compute(inputs[i]);
int actual = target.Compute(inputs[i]);
double h0 = hmm.LogLikelihood(inputs[i], 0);
double h1 = hmm.LogLikelihood(inputs[i], 1);
double c0 = target.LogLikelihood(inputs[i], 0);
double c1 = target.LogLikelihood(inputs[i], 1);
Assert.AreEqual(expected, actual);
Assert.AreEqual(h0, c0, 1e-10);
Assert.AreEqual(h1, c1, 1e-10);
Assert.IsFalse(double.IsNaN(c0));
Assert.IsFalse(double.IsNaN(c1));
}
}
public void RunTest()
{
HiddenMarkovClassifier hmm = HiddenMarkovClassifierPotentialFunctionTest.CreateModel1();
var function = new MarkovDiscreteFunction(hmm);
var model = new HiddenConditionalRandomField <int>(function);
var target = new HiddenQuasiNewtonLearning <int>(model);
double[] actual = new double[inputs.Length];
double[] expected = new double[inputs.Length];
for (int i = 0; i < inputs.Length; i++)
{
actual[i] = model.Compute(inputs[i]);
expected[i] = outputs[i];
}
for (int i = 0; i < inputs.Length; i++)
{
Assert.AreEqual(expected[i], actual[i]);
}
double ll0 = model.LogLikelihood(inputs, outputs);
double error = target.Run(inputs, outputs);
double ll1 = model.LogLikelihood(inputs, outputs);
for (int i = 0; i < inputs.Length; i++)
{
actual[i] = model.Compute(inputs[i]);
expected[i] = outputs[i];
}
Assert.AreEqual(-0.00046872579976353634, ll0, 1e-10);
Assert.AreEqual(0.0, error, 1e-10);
Assert.AreEqual(error, -ll1);
Assert.IsFalse(Double.IsNaN(ll0));
Assert.IsFalse(Double.IsNaN(error));
for (int i = 0; i < inputs.Length; i++)
{
Assert.AreEqual(expected[i], actual[i]);
}
Assert.IsTrue(ll1 > ll0);
}