import tensorflow as tf

          'sync_queues_step_end_', [main_fetch_group]))

    variable_mgr_post_init_ops = self.variable_mgr.get_post_init_ops()
    if variable_mgr_post_init_ops:
      post_init_op_group = tf.group(*variable_mgr_post_init_ops)
    else:
      post_init_op_group = None

