NanoBrain/NanoBrain-unitypackage
NanoBrain/NanoBrain-unitypackage
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Cleanup

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This commit is contained in:
Pascal Serrarens 2026-07-03 17:16:32 +02:00
parent aeb9cf7cea
commit 50e09c0db3
2 changed files with 4 additions and 113 deletions
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115
Runtime/Scripts/Core/Neuron.cs
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@ -666,95 +666,10 @@ namespace NanoBrain {
#region Back propagation
// public void BackPropagation(Synapse synapse, Vector3 error, float learningRate) {
// // Loss function:
// // Mean Squared Error (MSE) 1/n * sum(errors^2)
// // We use simplified here 1/2 * (error^2)
// // For vectors, we need to use MSE component wise.
// Vector3 loss = 0.5f * Vector3.Scale(error, error);
public void BackPropagation1D(float derivative, float learningRate) {
foreach (Synapse synapse in this.synapses)
synapse.BackPropagation(this, derivative, learningRate);
// // loss is a derivative of error
// // Backpropagation = loss * d(combinator)
// Vector3 delta2;
// switch (activator) {
// case ActivationType.Linear:
// // Derivative of this (f'()) would be 1.
// delta2 = loss * 1;
// break;
// case ActivationType.Power:
// delta2 = loss * (2 * this.combination);
// break;
// case ActivationType.Reciprocal:
// delta2 = loss * (-1 / (this.combination * this.combination));
// break;
// default:
// delta2 = loss;
// break;
// }
// Vector3 scaledOutput = Vector3.Scale(delta2, synapse.neuron.outputValue);
// float deltaWeight = Mathf.Abs(scaledOutput.x) + Mathf.Abs(scaledOutput.y) + Mathf.Abs(scaledOutput.z);
// synapse.weight += learningRate * deltaWeight;
// Debug.Log($"Updated weight: {error.magnitude} {error} {scaledOutput} {synapse.weight}");
// }
// public void BackPropagationWithLoss(Synapse synapse, Vector3 loss, float learningRate) {
// Vector3 delta2 = activator switch {
// ActivationType.Linear => loss * 1,
// ActivationType.Power => (Vector3)(loss * (2 * this.combination)),
// ActivationType.Reciprocal => (Vector3)(loss * (-1 / (this.combination * this.combination))),
// _ => loss,
// };
// Vector3 scaledOutput = Vector3.Scale(delta2, synapse.neuron.outputValue);
// float deltaWeight = Mathf.Abs(scaledOutput.x) + Mathf.Abs(scaledOutput.y) + Mathf.Abs(scaledOutput.z);
// synapse.weight += learningRate * deltaWeight;
// Debug.Log($"Updated weight: {loss.magnitude} {loss} {scaledOutput} {synapse.weight}");
// }
// public void BackPropagation1(Vector3 cost, Vector3 error, float learningRate) {
// cost = Vector3.Scale(error, error); // error^2
// float3 derivative = 2 * error; // derivative of (error^2)
// // inverted because it uses the non-convential
// // error=(actual-taget) instead of (target-actual)
// // dSSR / dPredicted
// // Bias
// float3 deltaBias = derivative;
// // deltaBias *= 1; // because bias is always fully applied
// Vector3 stepSize = deltaBias * learningRate;
// this.bias -= stepSize;
// foreach (Synapse synapse in this.synapses) {
// // derivative for the weight?
// float3 deltaSynapse = derivative; // dSSR/dPredicted
// // derivative for the previous activation
// deltaSynapse *= synapse.neuron.activation; // dPredicted/dWeight
// // // derivative for the activator
// // switch (activator) {
// // case ActivationType.Linear:
// // //delta2 *= 1;
// // break;
// // default:
// // break;
// // }
// float deltaWeight = length(deltaSynapse);
// synapse.weight += learningRate * deltaWeight;
// synapse.neuron.BackPropagation2(derivative * synapse.weight, learningRate);
// }
// }
public void BackPropagation0(float error, float learningRate) {
float derivative = 2 * error; // derivative of (error^2)
// inverted because it uses the non-convential
// error=(actual-taget) instead of (target-actual)
// dSSR / dPredicted
BackPropagation2(derivative, learningRate);
}
public void BackPropagation2(float derivative, float learningRate) {
// Bias
if (this.trainable) {
// This does not work well, because the derivative/error does not have a 3D direction
@ -770,30 +685,6 @@ namespace NanoBrain {
// this.bias -= deltaBias;
}
foreach (Synapse synapse in this.synapses) {
synapse.BackPropagation(this, derivative, learningRate);
// // derivative for the weight?
// float3 deltaSynapse = derivative; // dSSR/dActivator
// // derivative for the activator
// // dActivator/dCombinator
// switch (activator) {
// case ActivationType.Linear:
// //deltaSynapse *= 1;
// break;
// default:
// break;
// }
// // derivative for the previous activation
// // dCombinator/dWeight
// deltaSynapse *= synapse.neuron.activation;
// float deltaWeight = length(deltaSynapse);
// synapse.weight += learningRate * deltaWeight;
//BackPropagation2(derivative * synapse.weight, learningRate);
}
}
public void BackPropagation3D(Vector3 derivative, float learningRate) {

2
Runtime/Scripts/Core/Synapse.cs
View File

@ -56,7 +56,7 @@ namespace NanoBrain {
break;
}
this.neuron.BackPropagation2(derivative * this.weight, learningRate);
this.neuron.BackPropagation1D(derivative * this.weight, learningRate);
derivative *= math.length(this.neuron.activation);