protected internal override void BackPropagationStep(BackPropagationNetworkEntryContext context)
{
var nodeCtx = context.NodeContext;
var lowerCtxs = context.LowerConnectionContexts;
var upperCtxs = context.UpperConnectionContexts;
double error = 0.0;
foreach (var lCtx in lowerCtxs)
{
double currentError = ((ErrorContext)lCtx.RuleContext).Error;
var syn = lCtx.Connection as Synapse;
if (syn != null)
{
error += syn.Weight * currentError;
}
else
{
error += currentError;
}
}
var neuron = nodeCtx.Node as ActivationNeuron;
if (neuron != null)
{
error = neuron.ActivationFunction.Derivate(neuron.OutputValue) * error;
Adjust((IAdjustableItem)neuron, error, 1.0, (DeltaContext)nodeCtx.RuleContext);
}
foreach (var uCtx in upperCtxs)
{
var currentContext = ((ErrorContext)uCtx.RuleContext);
currentContext.Error = error;
var synapse = uCtx.Connection as Synapse;
if (synapse != null) Adjust((IAdjustableItem)synapse, error, synapse.InputValue, currentContext);
}
}
protected internal abstract void BackPropagationStep(BackPropagationNetworkEntryContext context);
protected internal virtual void EndBackPropagation(BackPropagationNetworkEntryContext[] contexts)
{
}
