public bool Train(List <double> input, List <double> idealOutput)
{
if ((input.Count != Layers.First().Size) || (idealOutput.Count != Layers.Last().Size))
{
return(false);
}
Dropout();
Run(input);
OutputLayer.InitDelta(idealOutput);
foreach (var layer in HiddenLayers.Reverse())
{
layer.CalcDelta();
}
foreach (var layer in Layers.Skip(1))
{
layer.UpdateWeights();
}
ClearDropout();
return(true);
}
private void BackPropagate(params double[] targets)
{
NumCalc++;
int actual = targets.ToList().IndexOf(targets.Max());
double[] outputs = OutputLayer.Select(a => a.Value).ToArray();
int predicted = outputs.ToList().IndexOf(outputs.Max());
if (actual == predicted)
{
Accuracy += 1;
}
int i = 0;
OutputLayer.ForEach(a => a.CalculateGradient(targets[i++]));
HiddenLayers.Reverse();
HiddenLayers.ForEach(a => a.AsParallel().ForAll(b => b.CalculateGradient()));
HiddenLayers.ForEach(a => a.AsParallel().ForAll(b => b.UpdateWeights(LearnRate, Momentum)));
HiddenLayers.Reverse();
OutputLayer.AsParallel().ForAll(a => a.UpdateWeights(LearnRate, Momentum));
i = 0;
double error = OutputLayer.Sum(a => Math.Abs(a.CalculateError(targets[i++])));
Error += error;
if (NumCalc % 1000 == 0)
{
Console.WriteLine($"Error: {Error / 1000 / 10} NumCalc: {NumCalc} Accuracy: {Accuracy / 10.0}");
Error = 0;
Accuracy = 0;
}
}
//误差反向传播,先不要更新权重，先计算所有的误差传播，然后再更新权重
public void BackPropagate(params double[] targets)
{
var i = 0;
OutputLayer.ForEach(a => a.CalculateErrorAndGradient(targets[i++])); //计算输出层的误差
TotalError = OutputLayer.Sum(a => Math.Abs(a.Error));
HiddenLayers.Reverse(); //将隐藏层反转，从后往前反推
//HiddenLayers.ForEach(a => a.ForEach(b => b.CalculateErrorAndGradient()));
foreach (List <Neuron> HiddenLayer in HiddenLayers)
{
Parallel.ForEach(HiddenLayer, a =>
{
a.CalculateErrorAndGradient();
});
}
//更新连接权重
OutputLayer.ForEach(a => a.UpdateWeights(LearnRate, Momentum));
//HiddenLayers.ForEach(a => a.ForEach(b => b.UpdateWeights(LearnRate, Momentum)));
foreach (List <Neuron> HiddenLayer in HiddenLayers)
{
Parallel.ForEach(HiddenLayer, a =>
{
a.UpdateWeights(LearnRate, Momentum);
});
}
HiddenLayers.Reverse();//将隐藏层反转回去
}
private void BackPropagate(params double[] targets)
{
var i = 0;
OutputLayer.ForEach(a => a.CalculateGradient(targets[i++]));
HiddenLayers.Reverse();
//HiddenLayers.ForEach(a => a.ForEach(b => b.CalculateGradient()));
HiddenLayers.ForEach(a =>
Parallel.ForEach(a, (b) =>
{
b.CalculateGradient();
})
);
//HiddenLayers.ForEach(a => a.ForEach(b => b.UpdateWeights(LearnRate, Momentum)));
HiddenLayers.ForEach(a =>
Parallel.ForEach(a, (b) =>
{
b.UpdateWeights(LearnRate, Momentum);
})
);
HiddenLayers.Reverse();
//OutputLayer.ForEach(a => a.UpdateWeights(LearnRate, Momentum));
Parallel.ForEach(OutputLayer, (on) =>
{
on.UpdateWeights(LearnRate, Momentum);
});
}
//Obliczenie gradientów i zaktualizowanie wag
private void BackPropagate(double[] targets)
{
var i = 0;
OutputLayer.ForEach(a => a.CalculateGradient(targets[i++]));
HiddenLayers.Reverse();
HiddenLayers.ForEach(a => a.ForEach(b => b.CalculateGradient()));
HiddenLayers.ForEach(a => a.ForEach(b => b.UpdateWeights(LearningRate, Momentum)));
HiddenLayers.Reverse();
OutputLayer.ForEach(a => a.UpdateWeights(LearningRate, Momentum));
}
private void BackPropagation(params double[] goal)
{
var i = 0;
ExitLayer.Neurons.ForEach(x => x.CalculateGradient(goal[i++]));
HiddenLayers.Reverse();
HiddenLayers.ForEach(x => x.Neurons.ForEach(y => y.CalculateGradient()));
HiddenLayers.ForEach(x => x.Neurons.ForEach(y => y.UpdateWeight(LearningRate, Momentum)));
HiddenLayers.Reverse();
ExitLayer.Neurons.ForEach(x => x.UpdateWeight(LearningRate, Momentum));
}
private void SetHiddenLayerNeuronsErrors()
{
foreach (var layer in HiddenLayers.Reverse())
{
foreach (var neuron in layer.Neurons)
{
var deltaSum = neuron.OutConnections.Sum(connection
=> connection.Destination.Error * connection.Weight.Value);
neuron.Error = GetDerivative(neuron) * deltaSum;
}
}
}