code: def testBroadcastSingleDevice(self):
      # Broadcasts on a single device are removed completely during rewrite.
      self._Test(
          _NcclBroadcast,
          lambda x, y: x,
          (["/device:GPU:0", "/device:GPU:0"],),
      )
  
imports: from functools import partial
  import numpy
  from tensorflow.python.framework import errors
  from tensorflow.python.framework import ops
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import gradients
  from tensorflow.python.ops import nccl_ops
  from tensorflow.python.platform import test
label_desc: Use image node_id 2 for calling the BroadcastTest obj's underlying member method code with example usage: obj.testBroadcastSingleDevice() without return types