docs: def rename(self, old_label_name, new_label_name):
          """
          Take into account that a label has been renamed
          """
          assert(old_label_name != new_label_name)
          self._bayes.pop(old_label_name)
          old_baye_dir = self._get_baye_dir(old_label_name)
          new_baye_dir = self._get_baye_dir(new_label_name)
          logger.info("Renaming label training {} -> {} : {} -> {}".format(
              old_label_name, new_label_name, old_baye_dir, new_baye_dir
          ))
          os.rename(old_baye_dir, new_baye_dir)