code: def testGetInputSpecsWithMissingSignatures(self, save_as_keras):
      export_path = self.createModelWithSingleInput(save_as_keras)
      if save_as_keras:
          model = tf.keras.models.load_model(export_path)
      else:
          model = tf.compat.v1.saved_model.load_v2(export_path)
      with self.assertRaises(ValueError):
          model_util.get_callable(model, "non_existent")
  
imports: import tempfile
  import unittest
  from absl.testing import parameterized
  import apache_beam
  from apache_beam.testing import util
  import numpy
  import tensorflow
  from tensorflow_model_analysis import constants
  from tensorflow_model_analysis.api import types
  from tensorflow_model_analysis.eval_saved_model import testutil
  from tensorflow_model_analysis.proto import config_pb2
  from tensorflow_model_analysis.utils import model_util
  from tensorflow_model_analysis.utils import util
  from tfx_bsl.tfxio import tf_example_record
  from google.protobuf import text_format
  from tensorflow.core.protobuf import saved_model_pb2
  from tensorflow_metadata.proto.v0 import schema_pb2
label_desc: Use image node_id 20 for calling the ModelUtilTest obj's underlying member method code with example usage: obj.testGetInputSpecsWithMissingSignatures(save_as_keras) without return types