code: def get_test_function(test_function_name):
      """Get the test function according to the test function name."""
  
      if test_function_name not in _MAKE_TEST_FUNCTIONS_MAP:
          return None
      return _MAKE_TEST_FUNCTIONS_MAP[test_function_name]
  
imports: import functools
  import io
  import itertools
  import operator
  import os
  import re
  import string
  import sys
  import tempfile
  import traceback
  import zipfile
  import numpy
  import tensorflow
  from google.protobuf import text_format
  from tensorflow.lite.testing import _pywrap_string_util
  from tensorflow.lite.testing import generate_examples_report
  from tensorflow.lite.tools import flatbuffer_utils
  from tensorflow.python.framework import convert_to_constants
  from tensorflow.python.saved_model import signature_constants
label_desc: Use image node_id 2 for calling a global function with example usage: get_test_function(test_function_name) and returns: _MAKE_TEST_FUNCTIONS_MAP, None