docs: public List<Prediction> getPredictionsByActualClass(int actualClass) {
          if (confusionMatrixMetaData == null)
              return null;
  
          List<Prediction> out = new ArrayList<>();
          for (Map.Entry<Pair<Integer, Integer>, List<Object>> entry : confusionMatrixMetaData.entrySet()) { //Entry Pair: (Actual,Predicted)
              if (entry.getKey().getFirst() == actualClass) {
                  int actual = entry.getKey().getFirst();
                  int predicted = entry.getKey().getSecond();
                  for (Object m : entry.getValue()) {
                      out.add(new Prediction(actual, predicted, m));
                  }
              }
          }
          return out;
      }