code: def _NormalizeIsInstance(ty):
      return _NORMALIZE_ISINSTANCE.get(ty, ty)
  
file_path: tensorflow/tensorflow/tools/api/lib/python_object_to_proto_visitor.py
imports: import enum
  import re
  import sys
  from google.protobuf import message
  from tensorflow.python.platform import tf_logging
  from tensorflow.python.util import deprecation
  from tensorflow.python.util import tf_decorator
  from tensorflow.python.util import tf_inspect
  from tensorflow.tools.api.lib import api_objects_pb2
label_desc: Use image node_id 2 for calling a global function with example usage: _NormalizeIsInstance(ty) and returns: _NORMALIZE_ISINSTANCE