code: def _get_num_workers(cluster_spec):
      """Gets number of workers including chief."""
      if not cluster_spec:
          return 0
      return len(
          cluster_spec.as_dict().get(_TaskType.WORKER, [])
      ) + len(cluster_spec.as_dict().get(_TaskType.CHIEF, []))
  
imports: import copy
  import json
  import os
  import threading
  import time
  from tensorflow.core.protobuf import config_pb2
  from tensorflow.python.client import session
  from tensorflow.python.distribute import distribute_coordinator_context
  from tensorflow.python.distribute import multi_worker_util
  from tensorflow.python.platform import tf_logging
  from tensorflow.python.training import coordinator
  from tensorflow.python.training import monitored_session
  from tensorflow.python.training import server_lib
label_desc: Use image node_id 1 for calling a global function with example usage: _get_num_workers(cluster_spec) and returns: unknown, int