public void TestCostFunctionAccumulation()
{
NNetwork network = NNetwork.SigmoidNetwork(new int[] { 2, 4, 3 });
NetworkTrainer trainer = new NetworkTrainer(network);
double[] train_set = new[] { 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1};
Assert.Throws(typeof (NoErrorInfoYetException), () => trainer.GetError());
double error;
trainer.TrainPrediction(train_set);
error = trainer.GetError();
Assert.AreNotEqual(error, 0);
trainer.TrainPrediction(train_set);
Assert.AreNotEqual(error, trainer.GetError());
}
// public static void Main()
// {
// TrainPrediction();
//// Sinus();
//// TestTanhLearningOnSinus();
//// TestTanhDerivative();
//
// }
public static void TrainPrediction()
{
NNetwork network = NNetwork.SigmoidNetwork(new int[] { 5, 1 });
network.RandomizeWeights(-1, 20);
NetworkTrainer trainer = new NetworkTrainer(network);
List<double> tr = new List<double>();
for (double i = 0; i <= 1; i=i+0.05)
{
tr.Add(i);
}
double[] train_set = tr.ToArray();//new double[] { 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1 };
double error = 1;
double delta = 1;
int j = 0;
for (; error > 0.01 && !(delta <= 0.00001) || j == 1; j++)
{
trainer.TrainPrediction(train_set, 0.0001, 0.2);
double new_cost = trainer.GetError();
delta = error - new_cost;
error = new_cost;
}
Console.Out.WriteLine(j+": "+error);
for (double i = 0; i <= 0.5; i=i+0.05)
{
network.SetInput(new double[] { i + 0.0, i + 0.1, i + 0.2, i + 0.3, i + 0.4 });
Show(new double[]
{
i+0.5,
network.GetOutput()[0],
// network.GetOutput()[1]
});
}
}
public void TrainPrediction()
{
NNetwork network = NNetwork.SigmoidNetwork(new int[] { 5, 2, 2 });
NetworkTrainer trainer = new NetworkTrainer(network);
double[] train_set = new double[] { 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1 };
trainer.TrainPrediction(train_set);
//todo
}
private double GetControlError(NetworkTrainer networkTrainer, double lambda, double alpha)
{
networkTrainer.IsLearning = false;
networkTrainer.TrainPrediction(test_data, lambda, alpha);
double error = Math.Abs(trainer.GetError());
networkTrainer.IsLearning = true;
return error;
}
private void buttonTrain_Click(object sender, EventArgs e)
{
groupPlotting.Enabled = false;
trainer = new NetworkTrainer(network);
double lambda = double.Parse(textLambda.Text);
double alpha = double.Parse(textAlpha.Text);
AssignData();
double error = 1;
double delta = 1;
double required_error = double.Parse(textErrorStop.Text);
double required_delta = double.Parse(textDeltaStop.Text);
int time_limit = int.Parse(textStopTime.Text)*1000;
int j = 0;
Stopwatch stopwatch = new Stopwatch();
stopwatch.Reset();
stopwatch.Start();
// while(error > required_error && (delta >= required_delta) || j == 1)
while (error > required_error && (delta >= 0) || j == 1)
{
trainer.TrainPrediction(train_data, lambda, alpha);
double new_error = Math.Abs(trainer.GetError());
delta = error - new_error;
error = new_error;
j++;
if (stopwatch.ElapsedMilliseconds > time_limit) break;
}
textError.Text = Math.Round(error, 5).ToString();
Double control_error = GetControlError(trainer, lambda, alpha);
textControlError.Text = Math.Round(control_error, 5).ToString();
textTimes.Text = j.ToString();
groupPlotting.Enabled = true;
}