import ray


def main():
    """Requests placement of a GPU actor."""

    @ray.remote(num_gpus=1, num_cpus=1)
    class GPUActor:
        def where_am_i(self):
            assert len(ray.get_gpu_ids()) == 1
            return "on-a-gpu-node"

    GPUActor.options(name="gpu_actor", lifetime="detached").remote()


if __name__ == "__main__":
    ray.init("auto", namespace="gpu-test")
    main()