def get_authentication_batch_proxy_manager(self):
if proxy is None:<EOL><INDENT>raise NullArgument()<EOL><DEDENT>raise Unimplemented()<EOL>
Gets an ``AuthenticationBatchProxyManager``.

        return:
                (osid.authentication.batch.AuthenticationBatchProxyManag
                er) - an ``AuthenticationBatchProxyManager``.
        raise:  OperationFailed - unable to complete request
        raise:  Unimplemented - ``supports_authentication_batch()`` is
                ``false``
        *compliance: optional -- This method must be implemented if
        ``supports_authentication_batch()`` is ``true``.*