Accord.MachineLearning.DecisionTrees.Pruning.ErrorBasedPruning.trackDecisions C# (CSharp) Method

        private void trackDecisions(DecisionNode root, double[] input, int index)
        {
            DecisionNode current = root;

            while (current != null)
            {
                subsets[current].Add(index);

                if (current.IsLeaf)
                {
                    actual[index] = current.Output.HasValue ? current.Output.Value : -1;
                    return;
                }

                int attribute = current.Branches.AttributeIndex;

                DecisionNode nextNode = null;

                foreach (DecisionNode branch in current.Branches)
                {
                    if (branch.Compute(input[attribute]))
                    {
                        nextNode = branch; break;
                    }
                }

                current = nextNode;
            }

            // Normal execution should not reach here.
            throw new InvalidOperationException("The tree is degenerated.");
        }
    }