/// <summary>
///
/// </summary>
/// <param name="dtree"></param>
private void InteractiveClassification(CvDTree dtree)
{
if (dtree == null)
{
return;
}
CvDTreeNode root = dtree.GetRoot();
CvDTreeTrainData data = dtree.GetData();
string input;
for (; ; )
{
CvDTreeNode node;
Console.Write("Start/Proceed with interactive mushroom classification (y/n): ");
input = Console.ReadLine();
if (input[0] != 'y' && input[0] != 'Y')
{
break;
}
Console.WriteLine("Enter 1-letter answers, '?' for missing/unknown value...");
// custom version of predict
node = root;
for (; ; )
{
CvDTreeSplit split = node.Split;
int dir = 0;
if (node.Left == null || node.Tn <= dtree.GetPrunedTreeIdx() || node.Split == null)
{
break;
}
for (; split != null; )
{
int j;
int vi = split.VarIdx;
int count = data.CatCount.DataArrayInt32[vi];
Console.Write("{0}: ", VarDesc[vi]);
input = Console.ReadLine();
if (input[0] == '?')
{
split = split.Next;
continue;
}
// convert the input character to the normalized value of the variable
unsafe
{
int* map = data.CatMap.DataInt32 + data.CatOfs.DataInt32[vi];
for (j = 0; j < count; j++)
{
if (map[j] == input[0])
{
break;
}
}
}
if (j < count)
{
dir = (split.Subset[j >> 5] & (1 << (j & 31))) != 0 ? -1 : 1;
if (split.Inversed)
{
dir = -dir;
}
break;
}
else
{
Console.WriteLine("Error: unrecognized value");
}
}
if (dir == 0)
{
Console.WriteLine("Impossible to classify the sample");
node = null;
break;
}
node = dir < 0 ? node.Left : node.Right;
}
if (node != null)
{
Console.Write("Prediction result: the mushroom is {0}\n", node.ClassIdx == 0 ? "EDIBLE" : "POISONOUS");
}
Console.Write("\n-----------------------------\n");
}
}