code: def wait_for_workers(
      num_expected_workers,
      scheduler_file_path,
      communication_type,
      timeout_after=0,
  ):
      """
      Waits until num_expected_workers workers are available based on
      the workers managed by scheduler_file_path, then returns 0. If
      timeout_after is specified, will return 1 if num_expected_workers
      workers are not available before the timeout.
      """
      # FIXME: use scheduler file path from global environment if none
      # supplied in configuration yaml
  
      print("wait_for_workers.py - initializing client...", end="")
      sys.stdout.flush()
      initialize_dask_cuda(communication_type)
      print("done.")
      sys.stdout.flush()
  
      ready = False
      start_time = time.time()
      while not ready:
          if timeout_after and (
              (time.time() - start_time) >= timeout_after
          ):
              print(
                  f"wait_for_workers.py timed out after {timeout_after} seconds before finding {num_expected_workers} workers."
              )
              sys.stdout.flush()
              break
          with Client(scheduler_file=scheduler_file_path) as client:
              num_workers = len(client.scheduler_info()["workers"])
              if num_workers < num_expected_workers:
                  print(
                      f"wait_for_workers.py expected {num_expected_workers} but got {num_workers}, waiting..."
                  )
                  sys.stdout.flush()
                  time.sleep(5)
              else:
                  print(
                      f"wait_for_workers.py got {num_workers} workers, done."
                  )
                  sys.stdout.flush()
                  ready = True
  
      if ready is False:
          return 1
      return 0
  
imports: import os
  import sys
  import time
  import yaml
  from dask.distributed import Client
label_desc: Use image node_id 2 for calling a global function with example usage: wait_for_workers(num_expected_workers, scheduler_file_path, communication_type, timeout_after) and returns: int, int