Program still running when i call the translate_batch

[itperson2024]

hi,
I am writing a program using qt. and When I call the function translate_batch, the program not stopping, my code is below:
I found the solution in the documentation and other references, but not find useful information. please help me to solve the problem, thanks.

int main()
{
SetConsoleOutputCP(CP_UTF8);
sentencepiece::SentencePieceProcessor processor;
const auto status = processor.Load("./spm.model");

std::vector<std::string> tokens;
processor.Encode("我参加了毕业典礼", &tokens);


for (const std::string &token : tokens) {
    std::cout << token << std::endl;
}

std::vector<std::vector<std::string>> batch;

std::vector<std::string>::iterator it;
it = tokens.begin();
tokens.insert(it, "zho_Hans");

it = tokens.end();
tokens.insert(it, "</s>");
batch.push_back(tokens);

ctranslate2::Translator translator("./nllb", ctranslate2::Device::CPU);
std::vector<std::vector<std::string>> target_prefix;

for (int i = 0; i < batch.size(); i++) {
    target_prefix.push_back({"eng_Latn"});
}

TranslationOptions options1 = TranslationOptions();
//options1.beam_size = 1;

std::vector<ctranslate2::TranslationResult> results = translator.translate_batch(batch, target_prefix, options1, 1, BatchType::Tokens);

for (const auto& translatedTokens : results) {
    std::string text;
    processor.Decode(translatedTokens.output(), &text);
    //std::string result = tokenizer.detokenize(translatedTokens.output());
    text = text.substr(9);
    std::cout << text << ' ';
    std::cout << std::endl;
}

return 1;

}