public override void Train()
{
if (UseLaplaceCorrection)
{
priorProb = new Dictionary <string, double>();
IEnumerable <string?> distinctLabels = TrainingInstances.Select(i => i.LabelValue).Distinct();
foreach (string?labelValue in distinctLabels)
{
priorProb.Add(labelValue ?? throw new NullReferenceException("Unlabeled instance in training instances. "), TrainingInstances.Count(i => i.LabelValue == labelValue) / (double)TrainingInstances.Count);
}
}
string splitFeatureName = GetSplitFeature(TrainingInstances, out double threshold);
rootNode = new Node(TrainingInstances, splitFeatureName, threshold);
SplitRecursive(rootNode, -1);
}
