code: def _parse_service(service) -> tuple[str, str]:
      """Converts a tf.data service string into a (protocol, address) tuple.
  
      Args:
        service: A string in the format "protocol://address" or just "address". If
          the string is only an address, the default protocol will be used.
  
      Returns:
        The (protocol, address) tuple
      """
      if not isinstance(service, str):
          raise ValueError(
              "`service` must be a string, but `service` was of type "
              f"{type(service)}. service={service}"
          )
      if not service:
          raise ValueError("`service` must not be empty")
      parts = service.split("://")
      if len(parts) == 2:
          protocol, address = parts
      elif len(parts) == 1:
          address = parts[0]
          protocol = _pywrap_utils.TF_DATA_DefaultProtocol()
      else:
          raise ValueError(
              "Malformed `service` string has multiple '://': "
              f"{service}."
          )
      # TODO(aaudibert): Considering validating reachability of address here.
      return (protocol, address)
  
imports: import enum
  import functools
  from typing import Callable
  from tensorflow.core.protobuf import data_service_pb2
  from tensorflow.python import tf2
  from tensorflow.python.data.experimental.ops import compression_ops
  from tensorflow.python.data.experimental.service import _pywrap_server_lib
  from tensorflow.python.data.experimental.service import _pywrap_utils
  from tensorflow.python.data.ops import dataset_ops
  from tensorflow.python.data.ops import options
  from tensorflow.python.data.ops import structured_function
  from tensorflow.python.data.ops.options import AutoShardPolicy
  from tensorflow.python.data.ops.options import ExternalStatePolicy
  from tensorflow.python.eager import context
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import tensor
  from tensorflow.python.framework import tensor_util
  from tensorflow.python.ops import gen_experimental_dataset_ops
  from tensorflow.python.ops import string_ops
  from tensorflow.python.saved_model import nested_structure_coder
  from tensorflow.python.util.tf_export import tf_export
label_desc: Use image node_id 7 for calling a global function with example usage: _parse_service(service) and returns: protocol,  address