NanoBrain/NanoBrain-unitypackage
NanoBrain/NanoBrain-unitypackage
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3D DeltaWeight fix

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This commit is contained in:
Pascal Serrarens 2026-07-06 11:22:23 +02:00
parent 50e09c0db3
commit 10e1dd0126
1 changed files with 15 additions and 12 deletions
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25
Runtime/Scripts/Core/Synapse.cs
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@ -36,9 +36,7 @@ namespace NanoBrain {
this.weight = weight;
}
public virtual void BackPropagation(Neuron receiver, float error, float learningRate) {
float derivative = error;
public virtual void BackPropagation(Neuron receiver, float derivative, float learningRate) {
switch (receiver.activator) {
case Neuron.ActivationType.Linear:
derivative *= 1;
@ -67,8 +65,6 @@ namespace NanoBrain {
}
public virtual void BackPropagation(Neuron receiver, Vector3 derivative, float learningRate) {
//Vector3 derivative = error;
switch (receiver.activator) {
case Neuron.ActivationType.Linear:
derivative *= 1;
@ -88,16 +84,23 @@ namespace NanoBrain {
this.neuron.BackPropagation3D(derivative * this.weight, learningRate);
derivative = Vector3.Scale(derivative, this.neuron.activation);
derivative *= math.length(this.neuron.activation);
if (this.trainable) {
// Compared to the 1D solution, this does not decrease the weight.
// direction and sign are different....
// Perhaps the sign is determine by the direction of the derivative and the neuron activation?
// When they are oppositie, the sign is negative? (or the other way round...)
this.weight += learningRate * derivative.magnitude;
float deltaWeight = learningRate * derivative.magnitude;
// Compared to the 1D solution, this does not decrease the weight because magnitude is always positive
// derivative.direction and derivative.sign are different....
if (AreOpposed(derivative, this.neuron.activation))
this.weight -= deltaWeight;
else
this.weight += deltaWeight;
}
}
public static bool AreOpposed(Vector3 a, Vector3 b) {
// Check if the angle between the vectors is > 90 degrees
return Vector3.Dot(a, b) < 0f;
}
}
}