path = file_io.join(
      saved_model_dir, saved_model_constants.SAVED_MODEL_FILENAME_PB
  )
  file_io.atomic_write_string_to_file(path, saved_model_proto_serialized)


def save_model_v1(
    graph_def: graph_pb2.GraphDef,
    output_dir: str,
    signature_def_map: _SignatureDefMap,
    tags: Collection[str],
    init_op_name: Optional[str] = None,

    signature_def_map: Signature key -> SignatureDef mapping.
    tags: Tags to attach to the saved MetaGraphDef.

  Returns:
    `True` upon successfully saving the model.
  """
  save_model.save_model_v1(
      exported_model.graph_def,
      dst_saved_model_path,
      signature_def_map,
      tags,
      init_op_name=exported_model.init_node_name,
      saver_def=_get_saver_def_or_none(exported_model),