code: def export(self, trxf_classifier: RuleSetClassifier):
      """
      Translate a given TRXF RuleSetClassifier to a PMML string
      @param trxf_classifier: A TRXF RuleSetClassifier
      @return: The corresponding PMML string
      """
      if self._reader.data_dictionary is None:
          raise AssertionError(
              "Missing data dictionary in reader object"
          )
      return self._serializer.serialize(
          self._reader.read(trxf_classifier)
      )
  
imports: from aix360.algorithms.rule_induction.trxf.classifier.ruleset_classifier import RuleSetClassifier
  from aix360.algorithms.rule_induction.trxf.pmml_export import AbstractSerializer, AbstractReader
label_desc: Use image node_id 2 for calling the PmmlExporter obj's underlying member method code with example usage: obj.export(trxf_classifier) and returns: self