code: def hello_world():
      c1 = complex_task.remote(random.randint(1, 10))
      c2 = complex_task.remote(random.randint(1, 10))
      return sum(ray.get([c1, c2]))
  
imports: import pytest
  import time
  import random
  import sys
  import subprocess
  from unittest.mock import patch
  import ray.util.client.server.server
  import ray.core.generated.ray_client_pb2
  from ray.util.client import _ClientContext, CURRENT_PROTOCOL_VERSION
  from ray.cluster_utils import cluster_not_supported
  import ray
label_desc: Use image node_id 1 for calling a global function with example usage: hello_world() and returns: sum