cmvn.h

Go to the documentation of this file.

// transform/cmvn.h

// Copyright 2009-2013 Microsoft Corporation
//                     Johns Hopkins University (author: Daniel Povey)

// See ../../COPYING for clarification regarding multiple authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//  http://www.apache.org/licenses/LICENSE-2.0
//
// THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
// WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
// MERCHANTABLITY OR NON-INFRINGEMENT.
// See the Apache 2 License for the specific language governing permissions and
// limitations under the License.


#ifndef KALDI_TRANSFORM_CMVN_H_
#define KALDI_TRANSFORM_CMVN_H_

#include "base/kaldi-common.h"
#include "matrix/matrix-lib.h"

namespace kaldi {

void InitCmvnStats(int32 dim, Matrix<double> *stats);

void AccCmvnStats(const VectorBase<BaseFloat> &feat,
                  BaseFloat weight,
                  MatrixBase<double> *stats);

void AccCmvnStats(const MatrixBase<BaseFloat> &feats,
                  const VectorBase<BaseFloat> *weights,  // or NULL
                  MatrixBase<double> *stats);

void ApplyCmvn(const MatrixBase<double> &stats,
               bool norm_vars,
               MatrixBase<BaseFloat> *feats);

void ApplyCmvnReverse(const MatrixBase<double> &stats,
                      bool norm_vars,
                      MatrixBase<BaseFloat> *feats);


void FakeStatsForSomeDims(const std::vector<int32> &dims,
                          MatrixBase<double> *stats);



}  // namespace kaldi

#endif  // KALDI_TRANSFORM_CMVN_H_