code: def main():
      wait_for_nodes(4)
  
      # Check that objects can be transferred from each node to each other node.
      for i in range(10):
          print("Iteration {}".format(i))
          results = [
              get_host_name.remote(get_host_name.remote(()))
              for _ in range(100)
          ]
          print(Counter(ray.get(results)))
          sys.stdout.flush()
  
      print("Success!")
      sys.stdout.flush()
      time.sleep(20)
  
imports: import sys
  import time
  from collections import Counter
  import ray
label_desc: Use image node_id 3 for calling a global function with example usage: main() without return types