public static void CalculateDistances(Dataset dataset)
{
double[,] avgdata = new double[dataset.LabelCount(), dataset.LabelCount()];
int[,] countdata = new int[dataset.LabelCount(), dataset.LabelCount()];
List <Tuple <double[], int> > data = new List <Tuple <double[], int> >();
for (int i = 0; i < dataset.Count(); i++)
{
data.Add(new Tuple <double[], int>(dataset.GetDatum(i), dataset.GetLabel(i)));
}
var query = data.GroupBy(x => x.Item2);
foreach (IGrouping <int, Tuple <double[], int> > grp1 in query)
{
foreach (IGrouping <int, Tuple <double[], int> > grp2 in query)
{
if (grp1 == grp2)
{
continue;
}
foreach (var x1 in grp1)
{
foreach (var x2 in grp2)
{
double dist = UMath.L1Distance(x1.Item1, x2.Item1);
avgdata[x1.Item2, x2.Item2] += dist;
countdata[x1.Item2, x2.Item2]++;
}
}
}
}
for (int i = 0; i < dataset.LabelCount(); i++)
{
for (int j = 0; j < dataset.LabelCount(); j++)
{
if (i == j)
{
continue;
}
avgdata[i, j] = avgdata[i, j] / (double)countdata[i, j];
}
}
Console.WriteLine("Distance statistics:");
for (int i = 0; i < dataset.LabelCount(); i++)
{
for (int j = 0; j < dataset.LabelCount(); j++)
{
if (i == j)
{
continue;
}
Console.WriteLine("Average distance, classes {0}-{1} = {2}", i, j, avgdata[i, j]);
}
}
}
