@abc.abstractmethod<EOL><INDENT>def get_assessment_batch_manager(self):<DEDENT>
return<EOL>
Gets an ``AssessmentBatchManager``.

        :return: an ``AssessmentBatchManager``
        :rtype: ``osid.assessment.batch.AssessmentBatchManager``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``Unimplemented`` -- ``supports_assessment_batch() is false``

        *compliance: optional -- This method must be implemented if
        ``supports_assessment_batch()`` is true.*