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danbev merged 3 commits into from
Jul 21, 2025
Merged

feat(server): hide language probabilities option behind flag #3328

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examples/server: hide language probabilities option behind flag
sachaarbonel Jul 18, 2025
f4ec957
code review
sachaarbonel Jul 21, 2025
e657ce5
fix
sachaarbonel Jul 21, 2025
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37 changes: 26 additions & 11 deletions examples/server/server.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -104,6 +104,7 @@ struct whisper_params {
bool flash_attn = false;
bool suppress_nst = false;
bool no_context = false;
bool language_probabilities = true;

std::string language = "en";
std::string prompt = "";
Expand Down Expand Up @@ -178,6 +179,7 @@ void whisper_print_usage(int /*argc*/, char ** argv, const whisper_params & para
fprintf(stderr, " -nc, --no-context [%-7s] do not use previous audio context\n", params.no_context ? "true" : "false");
fprintf(stderr, " -ng, --no-gpu [%-7s] do not use gpu\n", params.use_gpu ? "false" : "true");
fprintf(stderr, " -fa, --flash-attn [%-7s] flash attention\n", params.flash_attn ? "true" : "false");
fprintf(stderr, " -lp, --language-probabilities [%-7s] include language probabilities in verbose_json output\n", params.language_probabilities ? "true" : "false");
// Voice Activity Detection (VAD) parameters
fprintf(stderr, "\nVoice Activity Detection (VAD) options:\n");
fprintf(stderr, " --vad [%-7s] enable Voice Activity Detection (VAD)\n", params.vad ? "true" : "false");
Expand Down Expand Up @@ -237,6 +239,7 @@ bool whisper_params_parse(int argc, char ** argv, whisper_params & params, serve
else if (arg == "-sns" || arg == "--suppress-nst") { params.suppress_nst = true; }
else if (arg == "-nth" || arg == "--no-speech-thold") { params.no_speech_thold = std::stof(argv[++i]); }
else if (arg == "-nc" || arg == "--no-context") { params.no_context = true; }
else if (arg == "-lp" || arg == "--language-probabilities") { params.language_probabilities = true; }

// server params
else if ( arg == "--port") { sparams.port = std::stoi(argv[++i]); }
Expand All @@ -255,6 +258,7 @@ bool whisper_params_parse(int argc, char ** argv, whisper_params & params, serve
else if (arg == "-vmsd" || arg == "--vad-max-speech-duration-s") { params.vad_max_speech_duration_s = std::stof(argv[++i]); }
else if (arg == "-vp" || arg == "--vad-speech-pad-ms") { params.vad_speech_pad_ms = std::stoi(argv[++i]); }
else if (arg == "-vo" || arg == "--vad-samples-overlap") { params.vad_samples_overlap = std::stof(argv[++i]); }
else if (arg == "--language-probabilities") { params.language_probabilities = true; }
else {
fprintf(stderr, "error: unknown argument: %s\n", arg.c_str());
whisper_print_usage(argc, argv, params, sparams);
Expand Down Expand Up @@ -599,6 +603,10 @@ void get_req_parameters(const Request & req, whisper_params & params)
{
params.vad_samples_overlap = std::stof(req.get_file_value("vad_samples_overlap").content);
}
if (req.has_file("language_probabilities"))
{
params.language_probabilities = parse_str_to_bool(req.get_file_value("language_probabilities").content);
}
}

} // namespace
Expand Down Expand Up @@ -1024,25 +1032,32 @@ int main(int argc, char ** argv) {
} else if (params.response_format == vjson_format) {
/* try to match openai/whisper's Python format */
std::string results = output_str(ctx, params, pcmf32s);
// Get language probabilities
std::vector<float> lang_probs(whisper_lang_max_id() + 1, 0.0f);
const auto detected_lang_id = whisper_lang_auto_detect(ctx, 0, params.n_threads, lang_probs.data());

json jres = json{
{"task", params.translate ? "translate" : "transcribe"},
{"language", whisper_lang_str_full(whisper_full_lang_id(ctx))},
{"duration", float(pcmf32.size())/WHISPER_SAMPLE_RATE},
{"text", results},
{"segments", json::array()},
{"detected_language", whisper_lang_str_full(detected_lang_id)},
{"detected_language_probability", lang_probs[detected_lang_id]},
{"language_probabilities", json::object()}
{"segments", json::array()}
};
// Add all language probabilities
for (int i = 0; i <= whisper_lang_max_id(); ++i) {
if (lang_probs[i] > 0.001f) { // Only include non-negligible probabilities
jres["language_probabilities"][whisper_lang_str(i)] = lang_probs[i];

// Only compute language probabilities if requested (expensive operation)
if (params.language_probabilities) {
std::vector<float> lang_probs(whisper_lang_max_id() + 1, 0.0f);
const auto detected_lang_id = whisper_lang_auto_detect(ctx, 0, params.n_threads, lang_probs.data());

jres["detected_language"] = whisper_lang_str_full(detected_lang_id);
jres["detected_language_probability"] = lang_probs[detected_lang_id];
jres["language_probabilities"] = json::object();

// Add all language probabilities
for (int i = 0; i <= whisper_lang_max_id(); ++i) {
if (lang_probs[i] > 0.001f) { // Only include non-negligible probabilities
jres["language_probabilities"][whisper_lang_str(i)] = lang_probs[i];
}
}
}

const int n_segments = whisper_full_n_segments(ctx);
for (int i = 0; i < n_segments; ++i)
{
Expand Down
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