code: def _show_signature_def_map_keys(saved_model_dir, tag_set):
      """Prints the keys for each SignatureDef in the SignatureDef map.
  
      Prints the list of SignatureDef keys from the SignatureDef map specified by
      the given tag-set and SavedModel directory.
  
      Args:
        saved_model_dir: Directory containing the SavedModel to inspect.
        tag_set: Group of tag(s) of the MetaGraphDef to get SignatureDef map from,
            in string format, separated by ','. For tag-set contains multiple tags,
            all tags must be passed in.
      """
      signature_def_map = get_signature_def_map(
          saved_model_dir, tag_set
      )
      print(
          "The given SavedModel MetaGraphDef contains SignatureDefs with the "
          "following keys:"
      )
      for signature_def_key in sorted(signature_def_map.keys()):
          print('SignatureDef key: "%s"' % signature_def_key)
  
imports: import argparse
  import platform
  import ast
  import os
  import re
  from absl import app
  from absl import flags
  from absl.flags import argparse_flags
  import numpy
  from tensorflow.core.example import example_pb2
  from tensorflow.core.framework import types_pb2
  from tensorflow.core.protobuf import config_pb2
  from tensorflow.python.client import session
  from tensorflow.python.debug.wrappers import local_cli_wrapper
  from tensorflow.python.eager import def_function
  from tensorflow.python.eager import function
  from tensorflow.python.framework import meta_graph
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import tensor_spec
  from tensorflow.python.lib.io import file_io
  from tensorflow.python.platform import tf_logging
  from tensorflow.python.saved_model import load
  from tensorflow.python.saved_model import load_options
  from tensorflow.python.saved_model import loader
  from tensorflow.python.saved_model import save
  from tensorflow.python.saved_model import signature_constants
  from tensorflow.python.tools import saved_model_aot_compile
  from tensorflow.python.tools import saved_model_utils
  from tensorflow.python.tpu import tpu
  from tensorflow.python.util.compat import collections_abc
label_desc: Use image node_id 5 for calling a global function with example usage: _show_signature_def_map_keys(saved_model_dir, tag_set) without return types