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Limit number of tokens per second for whisper. #1958

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Mar 4, 2025
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Limit number of tokens per second for whisper. #1958

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2 changes: 1 addition & 1 deletion sherpa-onnx/csrc/offline-recognizer-whisper-impl.h
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Original file line number Diff line number Diff line change
Expand Up @@ -131,7 +131,7 @@ class OfflineRecognizerWhisperImpl : public OfflineRecognizerImpl {
auto cross_kv = model_->ForwardEncoder(std::move(mel));

auto results = decoder_->Decode(std::move(cross_kv.first),
std::move(cross_kv.second));
std::move(cross_kv.second), num_frames);

auto r = Convert(results[0], symbol_table_);
s->SetResult(r);
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3 changes: 2 additions & 1 deletion sherpa-onnx/csrc/offline-whisper-decoder.h
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Expand Up @@ -33,7 +33,8 @@ class OfflineWhisperDecoder {
* @return Return a vector of size `N` containing the decoded results.
*/
virtual std::vector<OfflineWhisperDecoderResult> Decode(
Ort::Value n_layer_cross_k, Ort::Value n_layer_cross_v) = 0;
Ort::Value n_layer_cross_k, Ort::Value n_layer_cross_v,
int32_t num_feature_frames) = 0;

virtual void SetConfig(const OfflineWhisperModelConfig &config) = 0;
};
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10 changes: 8 additions & 2 deletions sherpa-onnx/csrc/offline-whisper-greedy-search-decoder.cc
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Expand Up @@ -19,7 +19,8 @@ void OfflineWhisperGreedySearchDecoder::SetConfig(

std::vector<OfflineWhisperDecoderResult>
OfflineWhisperGreedySearchDecoder::Decode(Ort::Value cross_k,
Ort::Value cross_v) {
Ort::Value cross_v,
int32_t num_feature_frames) {
auto memory_info =
Ort::MemoryInfo::CreateCpu(OrtDeviceAllocator, OrtMemTypeDefault);

Expand Down Expand Up @@ -99,7 +100,12 @@ OfflineWhisperGreedySearchDecoder::Decode(Ort::Value cross_k,
int32_t n_text_ctx = model_->TextCtx();

std::vector<int32_t> predicted_tokens;
for (int32_t i = 0; i < n_text_ctx / 2; ++i) {

// assume at most 6 tokens per second
int32_t num_possible_tokens = num_feature_frames / 100 * 6;
num_possible_tokens = std::min<int32_t>(num_possible_tokens, n_text_ctx / 2);

for (int32_t i = 0; i < num_possible_tokens; ++i) {
if (max_token_id == model_->EOT()) {
break;
}
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5 changes: 3 additions & 2 deletions sherpa-onnx/csrc/offline-whisper-greedy-search-decoder.h
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Expand Up @@ -18,8 +18,9 @@ class OfflineWhisperGreedySearchDecoder : public OfflineWhisperDecoder {
OfflineWhisperModel *model)
: config_(config), model_(model) {}

std::vector<OfflineWhisperDecoderResult> Decode(Ort::Value cross_k,
Ort::Value cross_v) override;
std::vector<OfflineWhisperDecoderResult> Decode(
Ort::Value cross_k, Ort::Value cross_v,
int32_t num_feature_frames) override;

void SetConfig(const OfflineWhisperModelConfig &config) override;

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