public List<Double> generateEntropy(Map<FV, Collection<FV>> fv_list, int numInstances) {
List<Double> entropies = new ArrayList();
Iterator<Entry<FV, Collection<FV>>> iterator = fv_list.entrySet().iterator();
while (iterator.hasNext()) {
Entry<FV, Collection<FV>> next = iterator.next();
FV key = next.getKey();
key.setFrequency((double) next.getValue().size() / numInstances);
double[] counter = new double[key.getNumLabels()];
for (FV fv : next.getValue()) {
int idx = (int) fv.getLabel();
counter[idx]++;
}
key.setEntropy(calculateEntropy(counter, next.getValue().size()));
entropies.add(key.getEntropy());
}
return entropies;
}
