class_docstr: A reusable barrier class for worker synchronization.
docstr: Waits until all other callers reach the same wait call.
docstr_tok: ["Waits","until","all","other","callers","reach","the","same","wait","call","."]
code: def wait(self):
      """Waits until all other callers reach the same wait call."""
      self._local_sense.value = not self._flag
      with self._lock:
          self._counter += 1
          if self._counter == self._num_participants:
              self._counter = 0
              self._flag = self._local_sense.value
      with self._condition:
          while self._flag != self._local_sense.value:
              self._condition.wait()
          self._condition.notify_all()
  
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 2 for calling the _Barrier obj's underlying member method code with example usage: obj.wait() without return types