class_docstr: Returns the next ps task index for placement in round-robin order.
  
  This class is not to be used directly by users.  See instead
  `replica_device_setter()` below.
docstr: Create a new `_RoundRobinStrategy`.
  
  Args:
    num_tasks: Number of ps tasks to cycle among.
code: def __init__(self, num_tasks):
      """Create a new `_RoundRobinStrategy`.
  
      Args:
        num_tasks: Number of ps tasks to cycle among.
      """
      self._num_tasks = num_tasks
      self._next_task = 0
  
file_path: tensorflow-upstream/tensorflow/python/training/device_setter.py
imports: from tensorflow.core.framework import node_def_pb2
  from tensorflow.python.framework import device
  from tensorflow.python.platform import tf_logging
  from tensorflow.python.training import server_lib
  from tensorflow.python.util.tf_export import tf_export
label_desc: Use image node_id 1 to create a new _RoundRobinStrategy object  with example: obj = _RoundRobinStrategy(num_tasks)