void BackwardBreadth_ <T>(Scalar <T> target)
{
var delta = (Scalar <T>)_scalarDerivatives[target];
if (delta == null)
{
return;
}
target.Backward(delta, this);
}
public void PushGradientTo <T>(Scalar <T> target, Scalar <T> delta)
{
if (delta.IsZero)
{
return;
}
if (!_scalarDerivatives.ContainsKey(target))
{
_scalarDerivatives[target] = delta;
}
else
{
_scalarDerivatives[target] = (Scalar <T>)_scalarDerivatives[target] + delta;
}
if (!firstPass)
{
if (!nodeQueue.Contains(target))
{
nodeQueue.AddFirst(target);
}
deltaReceived[target] -= 1;
}
else
{
if (incrementTargetInputs)
{
if (!deltaReceived.ContainsKey(target))
{
deltaReceived[target] = 1;
}
else
{
deltaReceived[target] += 1;
}
}
var duplicated = visited.Contains(target);
if (duplicated)
{
needSecondPass += 1;
}
var copy = incrementTargetInputs;
incrementTargetInputs = incrementTargetInputs && !duplicated;
visited.Add(target);
target.Backward(delta, this);
incrementTargetInputs = copy;
}
}