/**
* Function to add all itemsets with unknown values for given attribute.
*
* @param source The dataset that contains all the itemsets.
* @param attIndex The index of the attribute with possible unknown values.
* @throws Exception
*/
public final void addWithUnknownValue(Dataset source, int attIndex) {
double[] probs;
double weight, newWeight;
int classIndex;
Itemset itemset;
int j;
probs = new double[perValue.length];
for (j = 0; j < perValue.length; j++) {
// if ( Comparators.isEqual( total, 0 ) )
if (total == 0) {
probs[j] = 1.0 / probs.length;
} else {
probs[j] = perValue[j] / total;
}
}
Enumeration enum2 = source.enumerateItemsets();
while (enum2.hasMoreElements()) {
itemset = (Itemset) enum2.nextElement();
if (itemset.isMissing(attIndex)) {
classIndex = (int) itemset.getClassValue();
weight = itemset.getWeight();
perClass[classIndex] = perClass[classIndex] + weight;
total = total + weight;
for (j = 0; j < perValue.length; j++) {
newWeight = probs[j] * weight;
perClassPerValue[j][classIndex] = perClassPerValue[j][classIndex] + newWeight;
perValue[j] = perValue[j] + newWeight;
}
}
}
}
