def get_grading_transform_manager(self):
raise errors.Unimplemented()<EOL>
Gets the ``GradingTransformManager``.

        return: (osid.grading.transform.GradingTransformManager) - a
                ``GradingTransformManager``
        raise:  OperationFailed - unable to complete request
        raise:  Unimplemented - ``supports_grading_transform() is
                false``
        *compliance: optional -- This method must be implemented if
        ``supports_grading_transform()`` is true.*