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34 lines
1.1 KiB
34 lines
1.1 KiB
#pragma once
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#include "base/common.h"
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#include "frontend/frontend_itf.h"
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#include "kaldi/matrix/kaldi-matrix.h"
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#include "kaldi/util/options-itf.h"
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namespace ppspeech {
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class CMVN : public FrontendInterface {
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public:
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explicit CMVN(std::string cmvn_file,
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std::unique_ptr<FrontendInterface> base_extractor);
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virtual void Accept(const kaldi::VectorBase<kaldi::BaseFloat>& inputs);
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// the length of feats = feature_row * feature_dim,
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// the Matrix is squashed into Vector
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virtual bool Read(kaldi::Vector<kaldi::BaseFloat>* feats);
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// the dim_ is the feautre dim.
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virtual size_t Dim() const { return dim_; }
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virtual void SetFinished() { base_extractor_->SetFinished(); }
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virtual bool IsFinished() const { return base_extractor_->IsFinished(); }
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virtual void Reset() { base_extractor_->Reset(); }
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private:
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void Compute(kaldi::VectorBase<kaldi::BaseFloat>* feats) const;
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void ApplyCMVN(kaldi::MatrixBase<BaseFloat>* feats);
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kaldi::Matrix<double> stats_;
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std::unique_ptr<FrontendInterface> base_extractor_;
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size_t dim_;
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bool var_norm_;
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};
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} // namespace ppspeech
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