Add asset support in SavedModel loader py.

Change: 136195816

tensorflow/python/saved_model/loader.py

@@ -66,6 +66,7 @@
 import os
 
 from google.protobuf import text_format
+from tensorflow.core.protobuf import meta_graph_pb2
 from tensorflow.core.protobuf import saved_model_pb2
 from tensorflow.python.lib.io import file_io
 from tensorflow.python.saved_model import constants
@@ -118,6 +119,37 @@ def _parse_saved_model(export_dir):
   return saved_model
 
 
+def _get_asset_tensors(export_dir, meta_graph_def_to_load):
+  """Gets the asset tensors, if defined in the meta graph def to load.
+
+  Args:
+    export_dir: Directory where the SavedModel is located.
+    meta_graph_def_to_load: The meta graph def from the SavedModel to be loaded.
+
+  Returns:
+    A dictionary of asset tensors, keyed by the name of the asset tensor. The
+    value in the map corresponds to the absolute path of the asset file.
+  """
+  # Collection-def that may contain the assets key.
+  collection_def = meta_graph_def_to_load.collection_def
+
+  asset_tensor_dict = {}
+  if constants.ASSETS_KEY in collection_def:
+    # Location of the assets for SavedModel.
+    assets_directory = os.path.join(
+        compat.as_bytes(export_dir),
+        compat.as_bytes(constants.ASSETS_DIRECTORY))
+    assets_any_proto = collection_def[constants.ASSETS_KEY].any_list.value
+    # Process each asset and add it to the asset tensor dictionary.
+    for asset_any_proto in assets_any_proto:
+      asset_proto = meta_graph_pb2.AssetFileDef()
+      asset_any_proto.Unpack(asset_proto)
+      asset_tensor_dict[asset_proto.tensor_info.name] = os.path.join(
+          compat.as_bytes(assets_directory),
+          compat.as_bytes(asset_proto.filename))
+  return asset_tensor_dict
+
+
 def load(sess, tags, export_dir):
   """Loads the model from a SavedModel as specified by tags.
 
@@ -161,5 +193,8 @@ def load(sess, tags, export_dir):
   # Restore the variables using the built saver in the provided session.
   saver.restore(sess, variables_path)
 
+  # Get asset tensors, if any.
+  _get_asset_tensors(export_dir, meta_graph_def_to_load)
+
   # Return the meta graph def that was loaded into the session.
   return meta_graph_def_to_load