code: public List<Prediction> getPredictionErrors() {
          if (this.confusionMatrixMetaData == null)
              return null;
  
          List<Prediction> list = new ArrayList<>();
  
          List<Map.Entry<Pair<Integer, Integer>, List<Object>>> sorted =
                          new ArrayList<>(confusionMatrixMetaData.entrySet());
          Collections.sort(sorted, new Comparator<Map.Entry<Pair<Integer, Integer>, List<Object>>>() {
              @Override
              public int compare(Map.Entry<Pair<Integer, Integer>, List<Object>> o1,
                              Map.Entry<Pair<Integer, Integer>, List<Object>> o2) {
                  Pair<Integer, Integer> p1 = o1.getKey();
                  Pair<Integer, Integer> p2 = o2.getKey();
                  int order = Integer.compare(p1.getFirst(), p2.getFirst());
                  if (order != 0)
                      return order;
                  order = Integer.compare(p1.getSecond(), p2.getSecond());
                  return order;
              }
          });
  
          for (Map.Entry<Pair<Integer, Integer>, List<Object>> entry : sorted) {
              Pair<Integer, Integer> p = entry.getKey();
              if (p.getFirst().equals(p.getSecond())) {
                  //predicted = actual -> not an error -> skip
                  continue;
              }
              for (Object m : entry.getValue()) {
                  list.add(new Prediction(p.getFirst(), p.getSecond(), m));
              }
          }
  
          return list;
      }
docs: Get a list of prediction errors, on a per-record basis<br>
  <p>
  <b>Note</b>: Prediction errors are ONLY available if the "evaluate with metadata"  method is used: {@link #eval(INDArray, INDArray, List)}
  Otherwise (if the metadata hasn't been recorded via that previously mentioned eval method), there is no value in
  splitting each prediction out into a separate Prediction object - instead, use the confusion matrix to get the counts,
  via {@link #getConfusionMatrix()}
  
  @return A list of prediction errors, or null if no metadata has been recorded