code: def is_smoke_test():
      return os.environ.get("IS_SMOKE_TEST", "0") == "1"
  
file_path: ray/release/serve_tests/workloads/serve_test_utils.py
imports: import json
  import logging
  import os
  import random
  import ray
  import re
  import subprocess
  from collections import defaultdict
  from serve_test_cluster_utils import NUM_CPU_PER_NODE
  from subprocess import PIPE
  from typing import Dict, List, Union
label_desc: Use image node_id 1 for calling a global function with example usage: is_smoke_test() and returns: unknown