class_docstr: Launch collectives on one replica.
class_docstr_tok: ["Launch","collectives","on","one","replica","."]
code: def _control_input(
      self, control_input: Union[core.TensorLike, ops.Operation]
  ):
      if control_input is not None and not self._use_ordering_token():
          return ops.control_dependencies([control_input])
      return ops.NullContextmanager()
  
imports: import copy
  import threading
  from typing import Callable, List, Optional, Union
  from tensorflow.python.distribute import collective_util
  from tensorflow.python.distribute import values
  from tensorflow.python.eager import backprop_util
  from tensorflow.python.eager import context
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import indexed_slices
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import tensor_spec
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import collective_ops
  from tensorflow.python.ops import cond
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops import nccl_ops
  from tensorflow.python.ops import resource_variable_ops
  from tensorflow.python.platform import tf_logging
  from tensorflow.python.types import core
label_desc: Use image node_id 2 for calling the CollectiveReplicaLauncher obj's underlying member method code with example usage: obj._control_input(control_input) and returns: ops, ops