docs: def remove_label(self, label):
          """Removes all results rows associated with `label`.
  
          :param label: label to filter results on
          :type label: `str`
  
          """
          self._logger.info('Removing label "{}"'.format(label))
          count = self._matches[constants.LABEL_FIELDNAME].value_counts().get(
              label, 0)
          self._matches = self._matches[
              self._matches[constants.LABEL_FIELDNAME] != label]
          self._logger.info('Removed {} labelled results'.format(count))