Python tensorflow.python.saved_model.signature_constants.REGRESS_METHOD_NAME Examples

def testRegressionSignatureDef(self):
    input1 = constant_op.constant("a", name="input-1")
    output1 = constant_op.constant("b", name="output-1")
    signature_def = signature_def_utils.regression_signature_def(input1,
                                                                 output1)

    self.assertEqual(signature_constants.REGRESS_METHOD_NAME,
                     signature_def.method_name)

    # Check inputs in signature def.
    self.assertEqual(1, len(signature_def.inputs))
    x_tensor_info_actual = (
        signature_def.inputs[signature_constants.REGRESS_INPUTS])
    self.assertEqual("input-1:0", x_tensor_info_actual.name)
    self.assertEqual(types_pb2.DT_STRING, x_tensor_info_actual.dtype)
    self.assertEqual(0, len(x_tensor_info_actual.tensor_shape.dim))

    # Check outputs in signature def.
    self.assertEqual(1, len(signature_def.outputs))
    y_tensor_info_actual = (
        signature_def.outputs[signature_constants.REGRESS_OUTPUTS])
    self.assertEqual("output-1:0", y_tensor_info_actual.name)
    self.assertEqual(types_pb2.DT_STRING, y_tensor_info_actual.dtype)
    self.assertEqual(0, len(y_tensor_info_actual.tensor_shape.dim)) 

def testConvertDefaultSignatureRegressionToSignatureDef(self):
    signatures_proto = manifest_pb2.Signatures()
    regression_signature = manifest_pb2.RegressionSignature()
    regression_signature.input.CopyFrom(
        manifest_pb2.TensorBinding(
            tensor_name=signature_constants.REGRESS_INPUTS))
    regression_signature.output.CopyFrom(
        manifest_pb2.TensorBinding(
            tensor_name=signature_constants.REGRESS_OUTPUTS))
    signatures_proto.default_signature.regression_signature.CopyFrom(
        regression_signature)
    signature_def = bundle_shim._convert_default_signature_to_signature_def(
        signatures_proto)

    # Validate regression signature correctly copied over.
    self.assertEqual(signature_def.method_name,
                     signature_constants.REGRESS_METHOD_NAME)
    self.assertEqual(len(signature_def.inputs), 1)
    self.assertEqual(len(signature_def.outputs), 1)
    self.assertProtoEquals(
        signature_def.inputs[signature_constants.REGRESS_INPUTS],
        meta_graph_pb2.TensorInfo(name=signature_constants.REGRESS_INPUTS))
    self.assertProtoEquals(
        signature_def.outputs[signature_constants.REGRESS_OUTPUTS],
        meta_graph_pb2.TensorInfo(name=signature_constants.REGRESS_OUTPUTS)) 

def testSavedModelBasic(self):
    base_path = test.test_src_dir_path(SAVED_MODEL_PATH)
    ops.reset_default_graph()
    sess, meta_graph_def = (
        bundle_shim.load_session_bundle_or_saved_model_bundle_from_path(
            base_path,
            tags=[tag_constants.SERVING],
            target="",
            config=config_pb2.ConfigProto(device_count={"CPU": 2})))

    self.assertTrue(sess)

    # Check basic signature def property.
    signature_def = meta_graph_def.signature_def
    self.assertEqual(len(signature_def), 2)
    self.assertEqual(
        signature_def[signature_constants.REGRESS_METHOD_NAME].method_name,
        signature_constants.REGRESS_METHOD_NAME)
    signature = signature_def["tensorflow/serving/regress"]
    asset_path = os.path.join(base_path, saved_model_constants.ASSETS_DIRECTORY)
    with sess.as_default():
      output1 = sess.run(["filename_tensor:0"])
      self.assertEqual(["foo.txt"], output1) 

def _is_valid_regression_signature(signature_def):
  """Determine whether the argument is a servable 'regress' SignatureDef."""
  if signature_def.method_name != signature_constants.REGRESS_METHOD_NAME:
    return False

  if (set(signature_def.inputs.keys())
      != set([signature_constants.REGRESS_INPUTS])):
    return False
  if (signature_def.inputs[signature_constants.REGRESS_INPUTS].dtype !=
      types_pb2.DT_STRING):
    return False

  if (set(signature_def.outputs.keys())
      != set([signature_constants.REGRESS_OUTPUTS])):
    return False
  if (signature_def.outputs[signature_constants.REGRESS_OUTPUTS].dtype !=
      types_pb2.DT_FLOAT):
    return False

  return True 

def testRegressionSignatureDef(self):
    input1 = constant_op.constant("a", name="input-1")
    output1 = constant_op.constant("b", name="output-1")
    signature_def = signature_def_utils.regression_signature_def(input1,
                                                                 output1)

    self.assertEqual(signature_constants.REGRESS_METHOD_NAME,
                     signature_def.method_name)

    # Check inputs in signature def.
    self.assertEqual(1, len(signature_def.inputs))
    x_tensor_info_actual = (
        signature_def.inputs[signature_constants.REGRESS_INPUTS])
    self.assertEqual("input-1:0", x_tensor_info_actual.name)
    self.assertEqual(types_pb2.DT_STRING, x_tensor_info_actual.dtype)
    self.assertEqual(0, len(x_tensor_info_actual.tensor_shape.dim))

    # Check outputs in signature def.
    self.assertEqual(1, len(signature_def.outputs))
    y_tensor_info_actual = (
        signature_def.outputs[signature_constants.REGRESS_OUTPUTS])
    self.assertEqual("output-1:0", y_tensor_info_actual.name)
    self.assertEqual(types_pb2.DT_STRING, y_tensor_info_actual.dtype)
    self.assertEqual(0, len(y_tensor_info_actual.tensor_shape.dim)) 

def testConvertDefaultSignatureRegressionToSignatureDef(self):
    signatures_proto = manifest_pb2.Signatures()
    regression_signature = manifest_pb2.RegressionSignature()
    regression_signature.input.CopyFrom(
        manifest_pb2.TensorBinding(
            tensor_name=signature_constants.REGRESS_INPUTS))
    regression_signature.output.CopyFrom(
        manifest_pb2.TensorBinding(
            tensor_name=signature_constants.REGRESS_OUTPUTS))
    signatures_proto.default_signature.regression_signature.CopyFrom(
        regression_signature)
    signature_def = bundle_shim._convert_default_signature_to_signature_def(
        signatures_proto)

    # Validate regression signature correctly copied over.
    self.assertEqual(signature_def.method_name,
                     signature_constants.REGRESS_METHOD_NAME)
    self.assertEqual(len(signature_def.inputs), 1)
    self.assertEqual(len(signature_def.outputs), 1)
    self.assertProtoEquals(
        signature_def.inputs[signature_constants.REGRESS_INPUTS],
        meta_graph_pb2.TensorInfo(name=signature_constants.REGRESS_INPUTS))
    self.assertProtoEquals(
        signature_def.outputs[signature_constants.REGRESS_OUTPUTS],
        meta_graph_pb2.TensorInfo(name=signature_constants.REGRESS_OUTPUTS)) 

def testSavedModelBasic(self):
    base_path = test.test_src_dir_path(SAVED_MODEL_PATH)
    ops.reset_default_graph()
    sess, meta_graph_def = (
        bundle_shim.load_session_bundle_or_saved_model_bundle_from_path(
            base_path,
            tags=[tag_constants.SERVING],
            target="",
            config=config_pb2.ConfigProto(device_count={"CPU": 2})))

    self.assertTrue(sess)

    # Check basic signature def property.
    signature_def = meta_graph_def.signature_def
    self.assertEqual(len(signature_def), 2)
    self.assertEqual(
        signature_def[signature_constants.REGRESS_METHOD_NAME].method_name,
        signature_constants.REGRESS_METHOD_NAME)
    signature = signature_def["tensorflow/serving/regress"]
    asset_path = os.path.join(base_path, saved_model_constants.ASSETS_DIRECTORY)
    with sess.as_default():
      output1 = sess.run(["filename_tensor:0"])
      self.assertEqual(["foo.txt"], output1) 

def regression_signature_def(examples, predictions):
  """Creates regression signature from given examples and predictions.

  Args:
    examples: `Tensor`.
    predictions: `Tensor`.

  Returns:
    A regression-flavored signature_def.

  Raises:
    ValueError: If examples is `None`.
  """
  if examples is None:
    raise ValueError('examples cannot be None for regression.')
  if predictions is None:
    raise ValueError('predictions cannot be None for regression.')

  input_tensor_info = utils.build_tensor_info(examples)
  signature_inputs = {signature_constants.REGRESS_INPUTS: input_tensor_info}

  output_tensor_info = utils.build_tensor_info(predictions)
  signature_outputs = {signature_constants.REGRESS_OUTPUTS: output_tensor_info}
  signature_def = build_signature_def(
      signature_inputs, signature_outputs,
      signature_constants.REGRESS_METHOD_NAME)

  return signature_def 

def regression_signature_def(examples, predictions):
  """Creates regression signature from given examples and predictions.

  Args:
    examples: `Tensor`.
    predictions: `Tensor`.

  Returns:
    A regression-flavored signature_def.

  Raises:
    ValueError: If examples is `None`.
  """
  if examples is None:
    raise ValueError('examples cannot be None for regression.')
  if predictions is None:
    raise ValueError('predictions cannot be None for regression.')

  input_tensor_info = utils.build_tensor_info(examples)
  signature_inputs = {signature_constants.REGRESS_INPUTS: input_tensor_info}

  output_tensor_info = utils.build_tensor_info(predictions)
  signature_outputs = {signature_constants.REGRESS_OUTPUTS: output_tensor_info}
  signature_def = build_signature_def(
      signature_inputs, signature_outputs,
      signature_constants.REGRESS_METHOD_NAME)

  return signature_def 

def regression_signature_def(examples, predictions):
  """Creates regression signature from given examples and predictions.

  Args:
    examples: `Tensor`.
    predictions: `Tensor`.

  Returns:
    A regression-flavored signature_def.

  Raises:
    ValueError: If examples is `None`.
  """
  if examples is None:
    raise ValueError('Regression examples cannot be None.')
  if not isinstance(examples, ops.Tensor):
    raise ValueError('Regression examples must be a string Tensor.')
  if predictions is None:
    raise ValueError('Regression predictions cannot be None.')

  input_tensor_info = utils.build_tensor_info(examples)
  if input_tensor_info.dtype != types_pb2.DT_STRING:
    raise ValueError('Regression examples must be a string Tensor.')
  signature_inputs = {signature_constants.REGRESS_INPUTS: input_tensor_info}

  output_tensor_info = utils.build_tensor_info(predictions)
  if output_tensor_info.dtype != types_pb2.DT_FLOAT:
    raise ValueError('Regression output must be a float Tensor.')
  signature_outputs = {signature_constants.REGRESS_OUTPUTS: output_tensor_info}

  signature_def = build_signature_def(
      signature_inputs, signature_outputs,
      signature_constants.REGRESS_METHOD_NAME)

  return signature_def 

def regression_signature_def(examples, predictions):
  """Creates regression signature from given examples and predictions.

  Args:
    examples: `Tensor`.
    predictions: `Tensor`.

  Returns:
    A regression-flavored signature_def.

  Raises:
    ValueError: If examples is `None`.
  """
  if examples is None:
    raise ValueError('examples cannot be None for regression.')
  if predictions is None:
    raise ValueError('predictions cannot be None for regression.')

  input_tensor_info = utils.build_tensor_info(examples)
  signature_inputs = {signature_constants.REGRESS_INPUTS: input_tensor_info}

  output_tensor_info = utils.build_tensor_info(predictions)
  signature_outputs = {signature_constants.REGRESS_OUTPUTS: output_tensor_info}
  signature_def = build_signature_def(
      signature_inputs, signature_outputs,
      signature_constants.REGRESS_METHOD_NAME)

  return signature_def 

def _convert_default_signature_to_signature_def(signatures):
  """Convert default signature to object of type SignatureDef.

  Args:
    signatures: object of type manifest_pb2.Signatures()

  Returns:
    object of type SignatureDef which contains a converted version of default
    signature from input signatures object

    Returns None if signature is of generic type because it cannot be converted
    to SignatureDef.

  """
  default_signature = signatures.default_signature
  signature_def = meta_graph_pb2.SignatureDef()
  if default_signature.WhichOneof("type") == "regression_signature":
    regression_signature = default_signature.regression_signature
    signature_def.method_name = signature_constants.REGRESS_METHOD_NAME
    _add_input_to_signature_def(regression_signature.input.tensor_name,
                                signature_constants.REGRESS_INPUTS,
                                signature_def)
    _add_output_to_signature_def(regression_signature.output.tensor_name,
                                 signature_constants.REGRESS_OUTPUTS,
                                 signature_def)
  elif default_signature.WhichOneof("type") == "classification_signature":
    classification_signature = default_signature.classification_signature
    signature_def.method_name = signature_constants.CLASSIFY_METHOD_NAME
    _add_input_to_signature_def(classification_signature.input.tensor_name,
                                signature_constants.CLASSIFY_INPUTS,
                                signature_def)
    _add_output_to_signature_def(classification_signature.classes.tensor_name,
                                 signature_constants.CLASSIFY_OUTPUT_CLASSES,
                                 signature_def)
    _add_output_to_signature_def(classification_signature.scores.tensor_name,
                                 signature_constants.CLASSIFY_OUTPUT_SCORES,
                                 signature_def)
  else:
    logging.error("Only classification and regression default signatures "
                  "are supported for up-conversion. %s is not "
                  "supported" % default_signature.WhichOneof("type"))
    return None
  return signature_def 

def testConvertSignaturesToSignatureDefs(self):
    base_path = test.test_src_dir_path(SESSION_BUNDLE_PATH)
    meta_graph_filename = os.path.join(base_path,
                                       constants.META_GRAPH_DEF_FILENAME)
    metagraph_def = meta_graph.read_meta_graph_file(meta_graph_filename)
    default_signature_def, named_signature_def = (
        bundle_shim._convert_signatures_to_signature_defs(metagraph_def))
    self.assertEqual(default_signature_def.method_name,
                     signature_constants.REGRESS_METHOD_NAME)
    self.assertEqual(len(default_signature_def.inputs), 1)
    self.assertEqual(len(default_signature_def.outputs), 1)
    self.assertProtoEquals(
        default_signature_def.inputs[signature_constants.REGRESS_INPUTS],
        meta_graph_pb2.TensorInfo(name="tf_example:0"))
    self.assertProtoEquals(
        default_signature_def.outputs[signature_constants.REGRESS_OUTPUTS],
        meta_graph_pb2.TensorInfo(name="Identity:0"))
    self.assertEqual(named_signature_def.method_name,
                     signature_constants.PREDICT_METHOD_NAME)
    self.assertEqual(len(named_signature_def.inputs), 1)
    self.assertEqual(len(named_signature_def.outputs), 1)
    self.assertProtoEquals(
        named_signature_def.inputs["x"], meta_graph_pb2.TensorInfo(name="x:0"))
    self.assertProtoEquals(
        named_signature_def.outputs["y"], meta_graph_pb2.TensorInfo(name="y:0"))

    # Now try default signature only
    collection_def = metagraph_def.collection_def
    signatures_proto = manifest_pb2.Signatures()
    signatures = collection_def[constants.SIGNATURES_KEY].any_list.value[0]
    signatures.Unpack(signatures_proto)
    named_only_signatures_proto = manifest_pb2.Signatures()
    named_only_signatures_proto.CopyFrom(signatures_proto)

    default_only_signatures_proto = manifest_pb2.Signatures()
    default_only_signatures_proto.CopyFrom(signatures_proto)
    default_only_signatures_proto.named_signatures.clear()
    default_only_signatures_proto.ClearField("named_signatures")
    metagraph_def.collection_def[constants.SIGNATURES_KEY].any_list.value[
        0].Pack(default_only_signatures_proto)
    default_signature_def, named_signature_def = (
        bundle_shim._convert_signatures_to_signature_defs(metagraph_def))
    self.assertEqual(default_signature_def.method_name,
                     signature_constants.REGRESS_METHOD_NAME)
    self.assertEqual(named_signature_def, None)

    named_only_signatures_proto.ClearField("default_signature")
    metagraph_def.collection_def[constants.SIGNATURES_KEY].any_list.value[
        0].Pack(named_only_signatures_proto)
    default_signature_def, named_signature_def = (
        bundle_shim._convert_signatures_to_signature_defs(metagraph_def))
    self.assertEqual(named_signature_def.method_name,
                     signature_constants.PREDICT_METHOD_NAME)
    self.assertEqual(default_signature_def, None) 

def export(model_version, model_dir, sess, x, y_op):
    """导出tensorflow_serving可用的模型
    SavedModel（tensorflow.python.saved_model）提供了一种跨语言格式来保存和恢复训练后的TensorFlow模型。它使用方法签名来定义Graph的输入和输出，使上层系统能够更方便地生成、调用或转换TensorFlow模型。
    SavedModelBuilder类提供保存Graphs、Variables及Assets的方法。所保存的Graphs必须标注用途标签。在这个实例中我们打算将模型用于服务而非训练，因此我们用SavedModel预定义好的tag_constant.Serving标签。
    为了方便地构建签名，SavedModel提供了signature_def_utils API。我们通过signature_def_utils.build_signature_def()来构建predict_signature。一个predict_signature至少包含以下参数：
    * inputs  = {'x': tensor_info_x} 指定输入的tensor信息
    * outputs = {'y': tensor_info_y} 指定输出的tensor信息
    * method_name = signature_constants.PREDICT_METHOD_NAME
    method_name定义方法名，它的值应该是tensorflow/serving/predict、tensorflow/serving/classify和tensorflow/serving/regress三者之一。Builder标签用来明确Meta Graph被加载的方式，只接受serve和train两种类型。
    """
    if model_version <= 0:
        logging.warning('Please specify a positive value for version number.')
        sys.exit()

    path = os.path.dirname(os.path.abspath(model_dir))
    if os.path.isdir(path) == False:
        logging.warning('Path (%s) not exists, making directories...', path)
        os.makedirs(path)

    export_path = os.path.join(
        compat.as_bytes(model_dir),
        compat.as_bytes(str(model_version)))

    if os.path.isdir(export_path) == True:
        logging.warning('Path (%s) exists, removing directories...', export_path)
        shutil.rmtree(export_path)

    builder = saved_model_builder.SavedModelBuilder(export_path)
    tensor_info_x = utils.build_tensor_info(x)
    tensor_info_y = utils.build_tensor_info(y_op)

    prediction_signature = signature_def_utils.build_signature_def(
        inputs={'x': tensor_info_x},
        outputs={'y': tensor_info_y},
        # signature_constants.CLASSIFY_METHOD_NAME = "tensorflow/serving/classify"
        # signature_constants.PREDICT_METHOD_NAME  = "tensorflow/serving/predict"
        # signature_constants.REGRESS_METHOD_NAME  = "tensorflow/serving/regress"
        # 如果缺失method_name会报错：
        # grpc.framework.interfaces.face.face.AbortionError: AbortionError(code=StatusCode.INTERNAL, details="Expected prediction signature method_name to be one of {tensorflow/serving/predict, tensorflow/serving/classify, tensorflow/serving/regress}. Was: ")
        method_name=signature_constants.PREDICT_METHOD_NAME)

    builder.add_meta_graph_and_variables(
        sess,
        # tag_constants.SERVING  = "serve"
        # tag_constants.TRAINING = "train"
        # 如果只有train标签，TensorFlow Serving加载时会报错：
        # E tensorflow_serving/core/aspired_versions_manager.cc:351] Servable {name: default version: 2} cannot be loaded: Not found: Could not find meta graph def matching supplied tags.
        [tag_constants.SERVING],
        signature_def_map={
            'predict_text': prediction_signature,
            # 如果缺失会报错：
            # grpc.framework.interfaces.face.face.AbortionError: AbortionError(code=StatusCode.FAILED_PRECONDITION, details="Default serving signature key not found.")
            signature_constants.DEFAULT_SERVING_SIGNATURE_DEF_KEY: prediction_signature
        })

    builder.save() 

def export(model_version, model_dir, sess, x, y_op):
    """导出tensorflow_serving可用的模型
    SavedModel（tensorflow.python.saved_model）提供了一种跨语言格式来保存和恢复训练后的TensorFlow模型。它使用方法签名来定义Graph的输入和输出，使上层系统能够更方便地生成、调用或转换TensorFlow模型。
    SavedModelBuilder类提供保存Graphs、Variables及Assets的方法。所保存的Graphs必须标注用途标签。在这个实例中我们打算将模型用于服务而非训练，因此我们用SavedModel预定义好的tag_constant.Serving标签。
    为了方便地构建签名，SavedModel提供了signature_def_utils API。我们通过signature_def_utils.build_signature_def()来构建predict_signature。一个predict_signature至少包含以下参数：
    * inputs  = {'x': tensor_info_x} 指定输入的tensor信息
    * outputs = {'y': tensor_info_y} 指定输出的tensor信息
    * method_name = signature_constants.PREDICT_METHOD_NAME
    method_name定义方法名，它的值应该是tensorflow/serving/predict、tensorflow/serving/classify和tensorflow/serving/regress三者之一。Builder标签用来明确Meta Graph被加载的方式，只接受serve和train两种类型。
    """
    if model_version <= 0:
        logging.warning('Please specify a positive value for version number.')
        sys.exit()

    path = os.path.dirname(os.path.abspath(model_dir))
    if os.path.isdir(path) == False:
        logging.warning('Path (%s) not exists, making directories...', path)
        os.makedirs(path)

    export_path = os.path.join(
        compat.as_bytes(model_dir),
        compat.as_bytes(str(model_version)))

    if os.path.isdir(export_path) == True:
        logging.warning('Path (%s) exists, removing directories...', export_path)
        shutil.rmtree(export_path)

    builder = saved_model_builder.SavedModelBuilder(export_path)
    tensor_info_x = utils.build_tensor_info(x)
    tensor_info_y = utils.build_tensor_info(y_op)

    prediction_signature = signature_def_utils.build_signature_def(
        inputs={'x': tensor_info_x},
        outputs={'y': tensor_info_y},
        # signature_constants.CLASSIFY_METHOD_NAME = "tensorflow/serving/classify"
        # signature_constants.PREDICT_METHOD_NAME  = "tensorflow/serving/predict"
        # signature_constants.REGRESS_METHOD_NAME  = "tensorflow/serving/regress"
        # 如果缺失method_name会报错：
        # grpc.framework.interfaces.face.face.AbortionError: AbortionError(code=StatusCode.INTERNAL, details="Expected prediction signature method_name to be one of {tensorflow/serving/predict, tensorflow/serving/classify, tensorflow/serving/regress}. Was: ")
        method_name=signature_constants.PREDICT_METHOD_NAME)

    builder.add_meta_graph_and_variables(
        sess,
        # tag_constants.SERVING  = "serve"
        # tag_constants.TRAINING = "train"
        # 如果只有train标签，TensorFlow Serving加载时会报错：
        # E tensorflow_serving/core/aspired_versions_manager.cc:351] Servable {name: default version: 2} cannot be loaded: Not found: Could not find meta graph def matching supplied tags.
        [tag_constants.SERVING],
        signature_def_map={
            'predict_text': prediction_signature,
            # 如果缺失会报错：
            # grpc.framework.interfaces.face.face.AbortionError: AbortionError(code=StatusCode.FAILED_PRECONDITION, details="Default serving signature key not found.")
            signature_constants.DEFAULT_SERVING_SIGNATURE_DEF_KEY: prediction_signature
        })

    builder.save() 

def testConvertSignaturesToSignatureDefs(self):
    base_path = test.test_src_dir_path(SESSION_BUNDLE_PATH)
    meta_graph_filename = os.path.join(base_path,
                                       constants.META_GRAPH_DEF_FILENAME)
    metagraph_def = meta_graph.read_meta_graph_file(meta_graph_filename)
    default_signature_def, named_signature_def = (
        bundle_shim._convert_signatures_to_signature_defs(metagraph_def))
    self.assertEqual(default_signature_def.method_name,
                     signature_constants.REGRESS_METHOD_NAME)
    self.assertEqual(len(default_signature_def.inputs), 1)
    self.assertEqual(len(default_signature_def.outputs), 1)
    self.assertProtoEquals(
        default_signature_def.inputs[signature_constants.REGRESS_INPUTS],
        meta_graph_pb2.TensorInfo(name="tf_example:0"))
    self.assertProtoEquals(
        default_signature_def.outputs[signature_constants.REGRESS_OUTPUTS],
        meta_graph_pb2.TensorInfo(name="Identity:0"))
    self.assertEqual(named_signature_def.method_name,
                     signature_constants.PREDICT_METHOD_NAME)
    self.assertEqual(len(named_signature_def.inputs), 1)
    self.assertEqual(len(named_signature_def.outputs), 1)
    self.assertProtoEquals(
        named_signature_def.inputs["x"], meta_graph_pb2.TensorInfo(name="x:0"))
    self.assertProtoEquals(
        named_signature_def.outputs["y"], meta_graph_pb2.TensorInfo(name="y:0"))

    # Now try default signature only
    collection_def = metagraph_def.collection_def
    signatures_proto = manifest_pb2.Signatures()
    signatures = collection_def[constants.SIGNATURES_KEY].any_list.value[0]
    signatures.Unpack(signatures_proto)
    named_only_signatures_proto = manifest_pb2.Signatures()
    named_only_signatures_proto.CopyFrom(signatures_proto)

    default_only_signatures_proto = manifest_pb2.Signatures()
    default_only_signatures_proto.CopyFrom(signatures_proto)
    default_only_signatures_proto.named_signatures.clear()
    default_only_signatures_proto.ClearField("named_signatures")
    metagraph_def.collection_def[constants.SIGNATURES_KEY].any_list.value[
        0].Pack(default_only_signatures_proto)
    default_signature_def, named_signature_def = (
        bundle_shim._convert_signatures_to_signature_defs(metagraph_def))
    self.assertEqual(default_signature_def.method_name,
                     signature_constants.REGRESS_METHOD_NAME)
    self.assertEqual(named_signature_def, None)

    named_only_signatures_proto.ClearField("default_signature")
    metagraph_def.collection_def[constants.SIGNATURES_KEY].any_list.value[
        0].Pack(named_only_signatures_proto)
    default_signature_def, named_signature_def = (
        bundle_shim._convert_signatures_to_signature_defs(metagraph_def))
    self.assertEqual(named_signature_def.method_name,
                     signature_constants.PREDICT_METHOD_NAME)
    self.assertEqual(default_signature_def, None)