if (!user_schemes->empty()) {
      auto is_requested_scheme = [user_schemes](const auto& scheme) {
        return std::find(user_schemes->begin(), user_schemes->end(), scheme) ==
               user_schemes->end();
      };
      auto end = std::remove_if(all_schemes->begin(), all_schemes->end(),
                                is_requested_scheme);
      all_schemes->erase(end, all_schemes->end());
    }

// TF_AttrMetadata.list_size and `storage` would be at least
// TF_AttrMetadata.total_size, obtained from TF_OperationGetAttrMetadata(oper,
// attr_name).
//
// Fails if storage_size is too small to hold the requested number of strings.
TF_CAPI_EXPORT extern void TF_OperationGetAttrStringList(
    TF_Operation* oper, const char* attr_name, void** values, size_t* lengths,