model = MultiSignatureModel()
    signatures = {
        'multiple_output_ops': model.multiple_output_ops,
        'duplicate_outputs': model.duplicate_outputs,
        'return_higher_index_only': model.return_higher_index_only,
    }
    saved_model_save.save(
        model, self._input_saved_model_path, signatures=signatures
    )

    tags = {tag_constants.SERVING}