// construct clone dictionary by insert or remove single label
public static void UpdateDicByAction(Dictionary <double, double>[] dicLabelAmount, double[] singleLabel, GiniHelper.ActionType action)
{
int labelDim = dicLabelAmount.Count();
for (int dim = 0; dim < labelDim; dim++)
{
var dimLabel = singleLabel[dim];
if (dicLabelAmount[dim].ContainsKey(dimLabel))
{
switch (action)
{
case ActionType.Insert:
dicLabelAmount[dim][dimLabel]++;
break;
case ActionType.Remove:
dicLabelAmount[dim][dimLabel]--;
break;
}
}
else
{
switch (action)
{
case ActionType.Insert:
dicLabelAmount[dim][dimLabel] = 1;
break;
case ActionType.Remove:
// label not in a dic, do nothing
break;
}
}
//clean from dic labels with zero amount
foreach (var item in dicLabelAmount[dim].Where(kvp => kvp.Value == 0).ToList())
{
dicLabelAmount[dim].Remove(item.Key);
}
}
}
public static double GetGiniByAction(Dictionary <double, double>[] dicLabelAmount, double[] singleLabel, GiniHelper.ActionType action, int numOfLabels)
{
var labelDim = singleLabel.Count();
UpdateDicByAction(dicLabelAmount, singleLabel, action);
return(GetGiniValueByDictionary(dicLabelAmount, numOfLabels));
}
