code: def serialize(module_str: str) -> tuple[str, int]:
      target = stablehlo.get_minimum_version()
      byte_str = stablehlo.serialize_portable_artifact(
          module_str, target
      )
      return byte_str, xla.call_module_maximum_supported_version()
  
imports: import os
  import re
  from typing import Optional, Sequence
  import unittest
  from absl.testing import parameterized
  import numpy
  from tensorflow.compiler.mlir.stablehlo import stablehlo
  from tensorflow.compiler.tests import xla_test
  from tensorflow.compiler.tf2xla.ops import gen_xla_ops
  from tensorflow.compiler.tf2xla.python import xla
  from tensorflow.core.protobuf import config_pb2
  from tensorflow.python.eager import def_function
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors
  from tensorflow.python.framework import function
  from tensorflow.python.framework import ops
  from tensorflow.python.platform import googletest
  from tensorflow.python.platform import test
label_desc: Use image node_id 1 for calling a global function with example usage: serialize(module_str) and returns: byte_str,  xla