offline-recognizer-fire-red-asr-impl.h
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// sherpa-onnx/csrc/offline-recognizer-fire-red-asr-impl.h
//
// Copyright (c) 2022-2023 Xiaomi Corporation
#ifndef SHERPA_ONNX_CSRC_OFFLINE_RECOGNIZER_FIRE_RED_ASR_IMPL_H_
#define SHERPA_ONNX_CSRC_OFFLINE_RECOGNIZER_FIRE_RED_ASR_IMPL_H_
#include <algorithm>
#include <cmath>
#include <memory>
#include <string>
#include <utility>
#include <vector>
#include "sherpa-onnx/csrc/offline-fire-red-asr-decoder.h"
#include "sherpa-onnx/csrc/offline-fire-red-asr-greedy-search-decoder.h"
#include "sherpa-onnx/csrc/offline-fire-red-asr-model.h"
#include "sherpa-onnx/csrc/offline-model-config.h"
#include "sherpa-onnx/csrc/offline-recognizer-impl.h"
#include "sherpa-onnx/csrc/offline-recognizer.h"
#include "sherpa-onnx/csrc/symbol-table.h"
#include "sherpa-onnx/csrc/transpose.h"
namespace sherpa_onnx {
static OfflineRecognitionResult Convert(
const OfflineFireRedAsrDecoderResult &src, const SymbolTable &sym_table) {
OfflineRecognitionResult r;
r.tokens.reserve(src.tokens.size());
std::string text;
for (auto i : src.tokens) {
if (!sym_table.Contains(i)) {
continue;
}
const auto &s = sym_table[i];
text += s;
r.tokens.push_back(s);
}
r.text = std::move(text);
return r;
}
class OfflineRecognizerFireRedAsrImpl : public OfflineRecognizerImpl {
public:
explicit OfflineRecognizerFireRedAsrImpl(
const OfflineRecognizerConfig &config)
: OfflineRecognizerImpl(config),
config_(config),
symbol_table_(config_.model_config.tokens),
model_(std::make_unique<OfflineFireRedAsrModel>(config.model_config)) {
Init();
}
template <typename Manager>
OfflineRecognizerFireRedAsrImpl(Manager *mgr,
const OfflineRecognizerConfig &config)
: OfflineRecognizerImpl(mgr, config),
config_(config),
symbol_table_(mgr, config_.model_config.tokens),
model_(std::make_unique<OfflineFireRedAsrModel>(mgr,
config.model_config)) {
Init();
}
void Init() {
if (config_.decoding_method == "greedy_search") {
decoder_ =
std::make_unique<OfflineFireRedAsrGreedySearchDecoder>(model_.get());
} else {
SHERPA_ONNX_LOGE(
"Only greedy_search is supported at present for FireRedAsr. Given %s",
config_.decoding_method.c_str());
SHERPA_ONNX_EXIT(-1);
}
const auto &meta_data = model_->GetModelMetadata();
config_.feat_config.normalize_samples = false;
config_.feat_config.high_freq = 0;
config_.feat_config.snip_edges = true;
}
std::unique_ptr<OfflineStream> CreateStream() const override {
return std::make_unique<OfflineStream>(config_.feat_config);
}
void DecodeStreams(OfflineStream **ss, int32_t n) const override {
// batch decoding is not implemented yet
for (int32_t i = 0; i != n; ++i) {
DecodeStream(ss[i]);
}
}
OfflineRecognizerConfig GetConfig() const override { return config_; }
private:
void DecodeStream(OfflineStream *s) const {
auto memory_info =
Ort::MemoryInfo::CreateCpu(OrtDeviceAllocator, OrtMemTypeDefault);
int32_t feat_dim = s->FeatureDim();
std::vector<float> f = s->GetFrames();
ApplyCMVN(&f);
int64_t num_frames = f.size() / feat_dim;
std::array<int64_t, 3> shape{1, num_frames, feat_dim};
Ort::Value x = Ort::Value::CreateTensor(memory_info, f.data(), f.size(),
shape.data(), shape.size());
int64_t len_shape = 1;
Ort::Value x_len =
Ort::Value::CreateTensor(memory_info, &num_frames, 1, &len_shape, 1);
auto cross_kv = model_->ForwardEncoder(std::move(x), std::move(x_len));
auto results = decoder_->Decode(std::move(cross_kv.first),
std::move(cross_kv.second), num_frames);
auto r = Convert(results[0], symbol_table_);
r.text = ApplyInverseTextNormalization(std::move(r.text));
r.text = ApplyHomophoneReplacer(std::move(r.text));
s->SetResult(r);
}
void ApplyCMVN(std::vector<float> *v) const {
const auto &meta_data = model_->GetModelMetadata();
const auto &mean = meta_data.mean;
const auto &inv_stddev = meta_data.inv_stddev;
int32_t feat_dim = static_cast<int32_t>(mean.size());
int32_t num_frames = static_cast<int32_t>(v->size()) / feat_dim;
float *p = v->data();
for (int32_t i = 0; i != num_frames; ++i) {
for (int32_t k = 0; k != feat_dim; ++k) {
p[k] = (p[k] - mean[k]) * inv_stddev[k];
}
p += feat_dim;
}
}
private:
OfflineRecognizerConfig config_;
SymbolTable symbol_table_;
std::unique_ptr<OfflineFireRedAsrModel> model_;
std::unique_ptr<OfflineFireRedAsrDecoder> decoder_;
};
} // namespace sherpa_onnx
#endif // SHERPA_ONNX_CSRC_OFFLINE_RECOGNIZER_FIRE_RED_ASR_IMPL_H_