code: def shutdown_tpu_system():
      """Shuts down the TPU system."""
  
      @def_function.function
      def _shutdown_tpu_system():
          return gen_dtensor_ops.shutdown_tpu_system()
  
      success = (
          _shutdown_tpu_system() if context.is_tfrt_enabled() else True
      )
      if success:
          logging.info("TPU system shut down.")
      else:
          logging.warning("TPU system fails to shut down.")
  
imports: import functools
  import time
  from typing import List, Optional, Dict
  import numpy
  from tensorflow.dtensor.python import config
  from tensorflow.dtensor.python import dtensor_device
  from tensorflow.dtensor.python import gen_dtensor_ops
  from tensorflow.dtensor.python import layout
  from tensorflow.python.eager import context
  from tensorflow.python.eager import def_function
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import errors
  from tensorflow.python.framework import ops
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import math_ops
  from tensorflow.python.platform import tf_logging
  from tensorflow.python.tpu import topology
  from tensorflow.python.util.tf_export import tf_export
label_desc: Use image node_id 3 for calling a global function with example usage: shutdown_tpu_system() and returns: gen_dtensor_ops