Status ConvertSignature(const std::string& sig_def_key,
                          const SignatureDef& signature_def);

  struct AssetInfo {
    std::string tensor_name;
    mlir::tf_saved_model::AssetOp op;
  };
  absl::StatusOr<std::vector<AssetInfo>> ConvertAssets();

  // Converts the initialization graph in the SavedModel to an MLIR function.