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Add C++ runtime for non-streaming faster conformer transducer from NeMo. (#854)

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This commit is contained in:
Fangjun Kuang
2024-05-10 12:15:39 +08:00
committed by GitHub
parent 5d8c35e44e
commit 17cd3a5f01
31 changed files with 1093 additions and 153 deletions
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48
sherpa-onnx/csrc/offline-stream.cc
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@@ -52,42 +52,25 @@ static void ComputeMeanAndInvStd(const float *p, int32_t num_rows,
}
}
void OfflineFeatureExtractorConfig::Register(ParseOptions *po) {
po->Register("sample-rate", &sampling_rate,
"Sampling rate of the input waveform. "
"Note: You can have a different "
"sample rate for the input waveform. We will do resampling "
"inside the feature extractor");
po->Register("feat-dim", &feature_dim,
"Feature dimension. Must match the one expected by the model.");
}
std::string OfflineFeatureExtractorConfig::ToString() const {
std::ostringstream os;
os << "OfflineFeatureExtractorConfig(";
os << "sampling_rate=" << sampling_rate << ", ";
os << "feature_dim=" << feature_dim << ")";
return os.str();
}
class OfflineStream::Impl {
public:
explicit Impl(const OfflineFeatureExtractorConfig &config,
explicit Impl(const FeatureExtractorConfig &config,
ContextGraphPtr context_graph)
: config_(config), context_graph_(context_graph) {
opts_.frame_opts.dither = 0;
opts_.frame_opts.snip_edges = false;
opts_.frame_opts.dither = config.dither;
opts_.frame_opts.snip_edges = config.snip_edges;
opts_.frame_opts.samp_freq = config.sampling_rate;
opts_.frame_opts.frame_shift_ms = config.frame_shift_ms;
opts_.frame_opts.frame_length_ms = config.frame_length_ms;
opts_.frame_opts.remove_dc_offset = config.remove_dc_offset;
opts_.frame_opts.window_type = config.window_type;
opts_.mel_opts.num_bins = config.feature_dim;
// Please see
// https://github.com/lhotse-speech/lhotse/blob/master/lhotse/features/fbank.py#L27
// and
// https://github.com/k2-fsa/sherpa-onnx/issues/514
opts_.mel_opts.high_freq = -400;
opts_.mel_opts.high_freq = config.high_freq;
opts_.mel_opts.low_freq = config.low_freq;
opts_.mel_opts.is_librosa = config.is_librosa;
fbank_ = std::make_unique<knf::OnlineFbank>(opts_);
}
@@ -237,7 +220,7 @@ class OfflineStream::Impl {
}
private:
OfflineFeatureExtractorConfig config_;
FeatureExtractorConfig config_;
std::unique_ptr<knf::OnlineFbank> fbank_;
std::unique_ptr<knf::OnlineWhisperFbank> whisper_fbank_;
knf::FbankOptions opts_;
@@ -245,9 +228,8 @@ class OfflineStream::Impl {
ContextGraphPtr context_graph_;
};
OfflineStream::OfflineStream(
const OfflineFeatureExtractorConfig &config /*= {}*/,
ContextGraphPtr context_graph /*= nullptr*/)
OfflineStream::OfflineStream(const FeatureExtractorConfig &config /*= {}*/,
ContextGraphPtr context_graph /*= nullptr*/)
: impl_(std::make_unique<Impl>(config, context_graph)) {}
OfflineStream::OfflineStream(WhisperTag tag)