code: def test_empty_line_thread_safety_bug(
      execution_number, ray_start_cluster
  ):
      """Make sure when new threads are used within __init__,
      the empty line is not printed.
      Related: https://github.com/ray-project/ray/pull/20987
      """
      cluster = ray_start_cluster
      cluster.add_node(num_cpus=24)
  
      actor_repr = "TESTER"
  
      script = f"""
  import time
  import os
  import threading
  import torch
  
  from filelock import FileLock
  
  import ray
  
  class Repro:
      pass
  
  def do_lock():
      path = f"/tmp/lock"
      lock = FileLock(path, timeout=4)
      lock.acquire()
  
  @ray.remote
  class Train:
      def __init__(self, config: Repro):
          # print("b")
          def warmup():
  
              do_lock()
              torch.empty(0, device="cpu")
              for _ in range(300000000):
                  pass
  
          threading.Thread(target=warmup, daemon=True).start()
  
      def ready(self):
          pass
  
      def __repr__(self):
          return "{actor_repr}"
  
  ray.init("auto")
  actors = [Train.remote(config=None) for i in range(24)]
  for a in actors:
      ray.get(a.ready.remote())
  time.sleep(5)
      """
      out = run_string_as_driver(script)
      assert actor_repr not in out
  
imports: import os
  import re
  import signal
  import subprocess
  import sys
  import time
  import pytest
  import ray
  from ray._private.test_utils import run_string_as_driver, run_string_as_driver_nonblocking, wait_for_condition
label_desc: Use image node_id 24 for calling a global function with example usage: test_empty_line_thread_safety_bug(execution_number, ray_start_cluster) without return types