code: def _normalize_name(name):
      """Normalizes operation name to TensorFlow rules."""
      return re.sub("[^a-zA-Z0-9_]", "_", name)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import re
  import os
  import ctypes
  from enum import Enum
  import random
  import string
  import warnings
  from tensorflow.python.framework import load_library
  from tensorflow.python.framework import ops
  from tensorflow.python.platform import resource_loader
  from byteps.common import get_ext_suffix
  from byteps.common import BytePSBasics
  from byteps.tensorflow.util import _executing_eagerly
  import tensorflow
label_desc: Use image node_id 3 for calling a global function with example usage: _normalize_name(name) and returns: re