FunctionNameToFunctionDefMap(const FunctionDefLibrary& library);

// Finds the "signatures" object in the object graph, and fills a mapping of
// each signature's name to the corresponding function's node in the object
// graph.
Status GetSignaturesMap(const SavedObjectGraph& saved_objects,
                        gtl::FlatMap<std::string, int>* signatures_map);

// Validates the `saved_function`.

        " outputs, but the SavedConcreteFunction has ", output_specs.size(),
        " flattened outputs.");
  }

  return Status();
}

}  // namespace

Status GetSignaturesMap(const SavedObjectGraph& saved_objects,
                        gtl::FlatMap<std::string, int>* signatures_map) {
  if (saved_objects.nodes().empty()) {
    return errors::FailedPrecondition("Saved Object Graph was empty.");