static Node BuildTree(Node root)
{
if (root.Class().HasValue)
{
Console.WriteLine();
Console.WriteLine($"All have class {root.Class()}");
Console.WriteLine(root.TrainingInstances);
return(root);
}
var paramName = SelectParameter(root.TrainingInstances);
foreach (var val in Enums.Items <Value>())
{
Console.WriteLine();
Console.WriteLine($"{paramName}={val}");
root.ChildNodes.Add(BuildTree(new Node(root.TrainingInstances
.Where(inst => inst.Parameters[paramName].Value == val)
.Select(inst => inst.Without(paramName))
.ToInstanceSet(), new Parameter(val, paramName))));
}
return(root);
}
static Class Classify(Node root, Instance instance)
{
if (root.Class().HasValue)
{
return(root.Class().Value);
}
return(Classify(root.ChildNodes.First(n => instance.Parameters[n.Parameter?.Name].Value == n.Parameter?.Value), instance));
}
