code: def _tpu_device_name(job, task, device):
      """Returns the device name for the TPU `device` on `task` of `job`."""
      if job is None:
          return "/task:%d/device:TPU:%d" % (task, device)
      else:
          return "/job:%s/task:%d/device:TPU:%d" % (job, task, device)
  
imports: import numpy
  from tensorflow.core.protobuf.tpu import topology_pb2
  from tensorflow.python.util.tf_export import tf_export
label_desc: Use image node_id 1 for calling a global function with example usage: _tpu_device_name(job, task, device) and returns: unknown, unknown