// graph.
Status GetSignaturesMap(const SavedObjectGraph& saved_objects,
                        gtl::FlatMap<std::string, int>* signatures_map);

// Validates the `saved_function`.
Status ValidateSingleConcreteFunction(const SavedFunction& saved_function);

// Walks through the SavedObjectGraph in metagraph, and restores all nodes
// (except "UserDefinedObjects") with their corresponding type in
// "PartiallyRevivedObjects".

  }

  for (const auto& child : signatures->children()) {
    (*signatures_map)[child.local_name()] = child.node_id();
  }
  return Status();
}

Status ValidateSingleConcreteFunction(const SavedFunction& saved_function) {
  // We only allow loading functions that have an annotated input signature,
  // which means there is 1:1 correspondence between tf.function