code: def __init__(self, num_workers):
      self._num_workers = num_workers
      self._num_finished_workers = tf.Variable(
          0, name="num_finished_workers"
      )
      self._finish_self = tf.assign_add(
          self._num_finished_workers, 1, use_locking=True
      )
  
file_path: euler/tf_euler/python/utils/hooks.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import time
  import tensorflow
label_desc: Use image node_id 1 to create a new SyncExitHook object from inherited base classes: tf.train with example: obj = SyncExitHook(num_workers)