public void TestBackPropWithKnownValues()
{
NNetwork n = NetworkTest.XorNetwork();
n.SetInput(new double[] { 1, 1 });
n.SetAnswers(new double[] { 0 });
n.BackPropagate();
double[] deltas = n.GetDeltasForLayer(2);
Assert.AreNotEqual(deltas[0], 0);
Assert.AreNotEqual(deltas[1], 0);
MyAssert.CloseTo(deltas[0], 0, 0.001);
MyAssert.CloseTo(deltas[1], 0, 0.001);
}
public void TestNetworkSetAnswerAndGetDelta()
{
NNetwork n = NNetwork.SigmoidNetwork(new int[] { 2, 3, 2 });
n.SetInput(new double[] { 0, 0 });
double[] outputs = n.GetOutput();
double[] answers = new double[] { 0.1, 0.9 };
n.SetAnswers(answers);
n.BackPropagate();
double[] deltas = n.GetDeltasForLayer(3);
for (int i = 0; i < answers.Length; i++)
{
MyAssert.CloseTo(deltas[i], answers[i] - outputs[i]);
}
}
public void CanNotGetDeltasForFirstLayer()
{
NNetwork n = NNetwork.SigmoidNetwork(new int[] { 2, 3, 2 });
Assert.Throws(typeof(CannotGetDeltasForThisLayer), () => n.GetDeltasForLayer(1));
}