public void Update(ref TScore score, float label, float weight, ref TMetrics loss)
{
SumWeights += weight;
TotalLabelW += label * weight;
TotalLabelSquaredW += label * label * weight;
UpdateCore(label, in score, in loss, weight);
}
protected abstract void Normalize(ref TMetrics src, ref TMetrics dst);
protected abstract void ApplyLossFunction(ref TScore score, float label, ref TMetrics loss);
protected abstract void UpdateCore(float label, ref TScore score, ref TMetrics loss, float weight);
