def get_assessment_batch_proxy_manager(self):
raise errors.Unimplemented()<EOL>
Gets an ``AssessmentBatchProxyManager``.

        return: (osid.assessment.batch.AssessmentBatchProxyManager) - an
                ``AssessmentBatchProxyManager``
        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.*