def METHOD_NAME(self, backend: Backend, backend_files: Sequence[str],
                  device: str):
    """Initialize the wrapper of backends.
    Args:
        backend (Backend): The backend enum, specifying backend type.
        backend_files (Sequence[str]): Paths to all required backend files
            (e.g. .onnx' for ONNX Runtime, '.param' and '.bin' for ncnn).
        device (str): A string represents device type.
    """
    output_names = self.output_names
    self.wrapper = BaseBackendModel._build_wrapper(
        backend=backend,
        backend_files=backend_files,
        device=device,
        input_names=[self.input_name],
        output_names=output_names,
        deploy_cfg=self.deploy_cfg)