message: Make saved models more deterministic
  Nondeterministic serialized protos hurt caching.
diff: @@ -139,7 +139,8 @@ class FunctionCallOptions(object):
  @config_proto_serialized.setter
  def config_proto_serialized(self, config):
  if isinstance(config, config_pb2.ConfigProto):
  - self._config_proto_serialized = config.SerializeToString()
  + self._config_proto_serialized = config.SerializeToString(
  + deterministic=True)
  elif isinstance(config, str):
  self._config_proto_serialized = config
  elif config is None:
  