code: def testNcclStress(self):
      self._setup_context(num_gpus=1)
  
      num_iters = 1000
      for _ in range(num_iters):
          with ops.device("/device:GPU:0"):
              collective_ops.all_reduce(
                  [1.0],
                  group_size=1,
                  group_key=0,
                  instance_key=0,
                  merge_op="Add",
                  final_op="Id",
                  communication_hint="NCCL",
              )
  
imports: import os
  import threading
  import time
  from tensorflow.python.eager import context
  from tensorflow.python.eager import def_function
  from tensorflow.python.framework import config
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import collective_ops
  from tensorflow.python.platform import test
label_desc: Use image node_id 13 for calling the CollectiveOpGPUTest obj's underlying member method code with example usage: obj.testNcclStress() without return types