code: public double similarityToLabel(LabelledDocument document, String label) {
          if (document.getReferencedContent() != null) {
              return similarityToLabel(document.getReferencedContent(), label);
          } else
              return similarityToLabel(document.getContent(), label);
      }
docs: This method returns similarity of the document to specific label, based on mean value
  
  @param document
  @param label
  @return