code: private List<Map.Entry<Long, Double>> getSortedCRF() {
      List<Map.Entry<Long, Double>> sortedCRF = new ArrayList<>(mBlockIdToCRFValue.entrySet());
      sortedCRF.sort(Comparator.comparingDouble(Entry::getValue));
      return sortedCRF;
    }
docs: Sorts all blocks in ascending order of CRF.
  
  @return the sorted CRF of all blocks