offline-whisper-decoder.h
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// sherpa-onnx/csrc/offline-whisper-decoder.h
//
// Copyright (c) 2023 Xiaomi Corporation
#ifndef SHERPA_ONNX_CSRC_OFFLINE_WHISPER_DECODER_H_
#define SHERPA_ONNX_CSRC_OFFLINE_WHISPER_DECODER_H_
#include <string>
#include <vector>
#include "onnxruntime_cxx_api.h" // NOLINT
#include "sherpa-onnx/csrc/offline-whisper-model-config.h"
namespace sherpa_onnx {
struct OfflineWhisperDecoderResult {
/// The decoded token IDs
std::vector<int32_t> tokens;
std::string lang;
};
class OfflineWhisperDecoder {
public:
virtual ~OfflineWhisperDecoder() = default;
/** Run beam search given the output from the whisper encoder model.
*
* @param n_layer_cross_k A 4-D tensor of shape
* (n_text_layer, N, n_audio_ctx, n_text_state).
* @param n_layer_cross_v A 4-D tensor of shape
* (n_text_layer, N, n_audio_ctx, n_text_state).
*
* @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,
int32_t num_feature_frames) = 0;
virtual void SetConfig(const OfflineWhisperModelConfig &config) = 0;
};
} // namespace sherpa_onnx
#endif // SHERPA_ONNX_CSRC_OFFLINE_WHISPER_DECODER_H_