builder_(kInitialBufferSize),
        saved_model_tags_(saved_model_tags),
        allow_all_select_tf_ops_(toco_flags.allow_all_select_tf_ops()),
        select_user_tf_ops_(toco_flags.select_user_tf_ops().begin(),
                            toco_flags.select_user_tf_ops().end()),
        metadata_(metadata),
        supported_backends_(toco_flags.supported_backends().begin(),

  std::unordered_set<std::string> tags;

  tensorflow::GraphImportConfig specs;
  specs.upgrade_legacy = upgrade_legacy;
  specs.prune_unused_nodes = true;

  if (!select_user_tf_ops.empty() && !emit_select_tf_ops) {
    llvm::errs() << "You must specify `emit-select-tf-ops=true` when passing "
                    "`select-user-tf-ops` flag.";
    return kTrFailure;
  }