code: def core(num: int) -> Text:
      """Returns the device name for a core in a replicated TPU computation.
  
      Args:
        num: the virtual core number within each replica to which operators should
        be assigned.
      Returns:
        A device name, suitable for passing to `tf.device()`.
      """
      return "device:TPU_REPLICATED_CORE:{}".format(num)
  
label_desc: Use image node_id 1 for calling a global function with example usage: core(num) and returns: str