code: def unpack(tensor):
      """Finds `tensor`'s parallel device and unpacks its components."""
      parallel_device = _all_parallel_devices.get(tensor.device, None)
      if parallel_device is None:
          raise ValueError(
              "{} is not a parallel device".format(tensor.device)
          )
      return parallel_device.unpack(tensor)
  
imports: import threading
  import weakref
  from tensorflow.python import _pywrap_parallel_device
  from tensorflow.python.distribute import device_util
  from tensorflow.python.eager import context
  from tensorflow.python.framework import composite_tensor
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import tensor
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import variables
  from tensorflow.python.tpu.ops import tpu_ops
  from tensorflow.python.util import nest
  from tensorflow.python.util import variable_utils
label_desc: Use image node_id 1 for calling a global function with example usage: unpack(tensor) and returns: parallel_device