1# Copyright 2019 The TensorFlow Authors. All Rights Reserved. 2# 3# Licensed under the Apache License, Version 2.0 (the "License"); 4# you may not use this file except in compliance with the License. 5# You may obtain a copy of the License at 6# 7# http://www.apache.org/licenses/LICENSE-2.0 8# 9# Unless required by applicable law or agreed to in writing, software 10# distributed under the License is distributed on an "AS IS" BASIS, 11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12# See the License for the specific language governing permissions and 13# limitations under the License. 14# ============================================================================== 15"""Classes and functions implementing to Model SavedModel serialization.""" 16 17from __future__ import absolute_import 18from __future__ import division 19from __future__ import print_function 20 21from tensorflow.python.keras.saving import saving_utils 22from tensorflow.python.keras.saving.saved_model import constants 23from tensorflow.python.keras.saving.saved_model import layer_serialization 24from tensorflow.python.keras.saving.saved_model import save_impl 25 26 27class ModelSavedModelSaver(layer_serialization.LayerSavedModelSaver): 28 """Model SavedModel serialization.""" 29 30 @property 31 def object_identifier(self): 32 return constants.MODEL_IDENTIFIER 33 34 def _python_properties_internal(self): 35 metadata = super(ModelSavedModelSaver, self)._python_properties_internal() 36 # Network stateful property is dependent on the child layers. 37 metadata.pop('stateful') 38 metadata['is_graph_network'] = self.obj._is_graph_network # pylint: disable=protected-access 39 metadata['save_spec'] = self.obj._get_save_spec(dynamic_batch=False) # pylint: disable=protected-access 40 41 metadata.update( 42 saving_utils.model_metadata( 43 self.obj, include_optimizer=True, require_config=False)) 44 return metadata 45 46 def _get_serialized_attributes_internal(self, serialization_cache): 47 default_signature = None 48 49 # Create a default signature function if this is the only object in the 50 # cache (i.e. this is the root level object). 51 if len(serialization_cache[constants.KERAS_CACHE_KEY]) == 1: 52 default_signature = save_impl.default_save_signature(self.obj) 53 54 # Other than the default signature function, all other attributes match with 55 # the ones serialized by Layer. 56 objects, functions = ( 57 super(ModelSavedModelSaver, self)._get_serialized_attributes_internal( 58 serialization_cache)) 59 functions['_default_save_signature'] = default_signature 60 return objects, functions 61 62 63class SequentialSavedModelSaver(ModelSavedModelSaver): 64 65 @property 66 def object_identifier(self): 67 return constants.SEQUENTIAL_IDENTIFIER 68