online-transducer-modified-beam-search-decoder.h
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// sherpa-onnx/csrc/online-transducer-modified_beam-search-decoder.h
//
// Copyright (c) 2023 Pingfeng Luo
// Copyright (c) 2023 Xiaomi Corporation
#ifndef SHERPA_ONNX_CSRC_ONLINE_TRANSDUCER_MODIFIED_BEAM_SEARCH_DECODER_H_
#define SHERPA_ONNX_CSRC_ONLINE_TRANSDUCER_MODIFIED_BEAM_SEARCH_DECODER_H_
#include <vector>
#include "sherpa-onnx/csrc/online-lm.h"
#include "sherpa-onnx/csrc/online-stream.h"
#include "sherpa-onnx/csrc/online-transducer-decoder.h"
#include "sherpa-onnx/csrc/online-transducer-model.h"
namespace sherpa_onnx {
class OnlineTransducerModifiedBeamSearchDecoder
: public OnlineTransducerDecoder {
public:
OnlineTransducerModifiedBeamSearchDecoder(OnlineTransducerModel *model,
OnlineLM *lm,
int32_t max_active_paths,
float lm_scale, int32_t unk_id,
float blank_penalty,
float temperature_scale)
: model_(model),
lm_(lm),
max_active_paths_(max_active_paths),
lm_scale_(lm_scale),
unk_id_(unk_id),
blank_penalty_(blank_penalty),
temperature_scale_(temperature_scale) {}
OnlineTransducerDecoderResult GetEmptyResult() const override;
void StripLeadingBlanks(OnlineTransducerDecoderResult *r) const override;
void Decode(Ort::Value encoder_out,
std::vector<OnlineTransducerDecoderResult> *result) override;
void Decode(Ort::Value encoder_out, OnlineStream **ss,
std::vector<OnlineTransducerDecoderResult> *result) override;
void UpdateDecoderOut(OnlineTransducerDecoderResult *result) override;
private:
OnlineTransducerModel *model_; // Not owned
OnlineLM *lm_; // Not owned
int32_t max_active_paths_;
float lm_scale_; // used only when lm_ is not nullptr
int32_t unk_id_;
float blank_penalty_;
float temperature_scale_;
};
} // namespace sherpa_onnx
#endif // SHERPA_ONNX_CSRC_ONLINE_TRANSDUCER_MODIFIED_BEAM_SEARCH_DECODER_H_