code: def test_ray_start_set_node_labels(call_ray_start):
      ray.init(address=call_ray_start)
      node_info = ray.nodes()[0]
      assert node_info["Labels"] == add_default_labels(
          node_info, {"gpu_type": "A100", "region": "us"}
      )
  
file_path: ray/python/ray/tests/test_node_labels.py
imports: import os
  import sys
  import pytest
  import subprocess
  import ray
  from ray.cluster_utils import AutoscalingCluster
  from ray._private.test_utils import wait_for_condition
label_desc: Use image node_id 3 for calling a global function with example usage: test_ray_start_set_node_labels(call_ray_start) without return types