CovarianceStats Class Reference

Collaboration diagram for CovarianceStats:

Public Member Functions
	CovarianceStats (int32 dim)
void	GetTotalCovar (SpMatrix< double > *tot_covar) const
	get total covariance, normalized per number of frames. More...
void	GetWithinCovar (SpMatrix< double > *within_covar)
void	AccStats (const Matrix< double > &utts_of_this_spk)
bool	SingularTotCovar ()
	Will return Empty() if the within-class covariance matrix would be zero. More...
bool	Empty ()
std::string	Info ()
int32	Dim ()
void	AddStats (const CovarianceStats &other)

Private Member Functions
	KALDI_DISALLOW_COPY_AND_ASSIGN (CovarianceStats)

Private Attributes
SpMatrix< double >	tot_covar_
SpMatrix< double >	between_covar_
int32	num_spk_
int32	num_utt_

Detailed Description

Definition at line 30 of file ivector-compute-lda.cc.

Constructor & Destructor Documentation

CovarianceStats()

CovarianceStats ( int32  dim )

inline

Definition at line 32 of file ivector-compute-lda.cc.

                            : tot_covar_(dim),
                              between_covar_(dim),
                              num_spk_(0),
                              num_utt_(0) { }

Member Function Documentation

AccStats()

void AccStats ( const Matrix< double > &  utts_of_this_spk )

inline

Definition at line 49 of file ivector-compute-lda.cc.

References SpMatrix< Real >::AddMat2(), VectorBase< Real >::AddRowSumMat(), SpMatrix< Real >::AddVec2(), CovarianceStats::between_covar_, CovarianceStats::Dim(), kaldi::kTrans, CovarianceStats::num_spk_, CovarianceStats::num_utt_, MatrixBase< Real >::NumRows(), and CovarianceStats::tot_covar_.

Referenced by kaldi::ComputeLdaTransform().

                                                        {
    int32 num_utts = utts_of_this_spk.NumRows();
    tot_covar_.AddMat2(1.0, utts_of_this_spk, kTrans, 1.0);
    Vector<double> spk_average(Dim());
    spk_average.AddRowSumMat(1.0 / num_utts, utts_of_this_spk);
    between_covar_.AddVec2(num_utts, spk_average);
    num_utt_ += num_utts;
    num_spk_ += 1;
  }

AddStats()

void AddStats ( const CovarianceStats &  other )

inline

Definition at line 68 of file ivector-compute-lda.cc.

References SpMatrix< Real >::AddSp(), CovarianceStats::between_covar_, CovarianceStats::KALDI_DISALLOW_COPY_AND_ASSIGN(), CovarianceStats::num_spk_, CovarianceStats::num_utt_, and CovarianceStats::tot_covar_.

                                              {
    tot_covar_.AddSp(1.0, other.tot_covar_);
    between_covar_.AddSp(1.0, other.between_covar_);
    num_spk_ += other.num_spk_;
    num_utt_ += other.num_utt_;
  }

Dim()

int32 Dim ( )

inline

Definition at line 66 of file ivector-compute-lda.cc.

References PackedMatrix< Real >::NumRows(), and CovarianceStats::tot_covar_.

Referenced by CovarianceStats::AccStats(), and CovarianceStats::SingularTotCovar().

{ return tot_covar_.NumRows(); }

Empty()

bool Empty ( )

inline

Definition at line 60 of file ivector-compute-lda.cc.

References CovarianceStats::num_spk_, and CovarianceStats::num_utt_.

Referenced by kaldi::ComputeLdaTransform().

{ return (num_utt_ - num_spk_ == 0); }

GetTotalCovar()

void GetTotalCovar ( SpMatrix< double > *  tot_covar ) const

inline

get total covariance, normalized per number of frames.

Definition at line 38 of file ivector-compute-lda.cc.

References KALDI_ASSERT, CovarianceStats::num_utt_, PackedMatrix< Real >::Scale(), and CovarianceStats::tot_covar_.

Referenced by kaldi::ComputeLdaTransform().

                                                        {
    KALDI_ASSERT(num_utt_ > 0);
    *tot_covar = tot_covar_;
    tot_covar->Scale(1.0 / num_utt_);
  }

GetWithinCovar()

void GetWithinCovar ( SpMatrix< double > *  within_covar )

inline

Definition at line 43 of file ivector-compute-lda.cc.

References SpMatrix< Real >::AddSp(), CovarianceStats::between_covar_, KALDI_ASSERT, CovarianceStats::num_spk_, CovarianceStats::num_utt_, PackedMatrix< Real >::Scale(), and CovarianceStats::tot_covar_.

Referenced by kaldi::ComputeLdaTransform().

                                                      {
    KALDI_ASSERT(num_utt_ - num_spk_ > 0);
    *within_covar = tot_covar_;
    within_covar->AddSp(-1.0, between_covar_);
    within_covar->Scale(1.0 / num_utt_);
  }

Info()

std::string Info ( )

inline

Definition at line 61 of file ivector-compute-lda.cc.

References CovarianceStats::num_spk_, and CovarianceStats::num_utt_.

Referenced by kaldi::ComputeLdaTransform().

                   {
    std::ostringstream ostr;
    ostr << num_spk_ << " speakers, " << num_utt_ << " utterances. ";
    return ostr.str();
  }

KALDI_DISALLOW_COPY_AND_ASSIGN()

KALDI_DISALLOW_COPY_AND_ASSIGN ( CovarianceStats  )

private

Referenced by CovarianceStats::AddStats().

SingularTotCovar()

bool SingularTotCovar ( )

inline

Will return Empty() if the within-class covariance matrix would be zero.

Definition at line 59 of file ivector-compute-lda.cc.

References CovarianceStats::Dim(), and CovarianceStats::num_utt_.

Referenced by kaldi::ComputeLdaTransform().

{ return (num_utt_ < Dim()); }

Member Data Documentation

between_covar_

SpMatrix<double> between_covar_

private

Definition at line 77 of file ivector-compute-lda.cc.

Referenced by CovarianceStats::AccStats(), CovarianceStats::AddStats(), and CovarianceStats::GetWithinCovar().

num_spk_

int32 num_spk_

private

Definition at line 78 of file ivector-compute-lda.cc.

Referenced by CovarianceStats::AccStats(), CovarianceStats::AddStats(), CovarianceStats::Empty(), CovarianceStats::GetWithinCovar(), and CovarianceStats::Info().

num_utt_

int32 num_utt_

private

Definition at line 79 of file ivector-compute-lda.cc.

Referenced by CovarianceStats::AccStats(), CovarianceStats::AddStats(), CovarianceStats::Empty(), CovarianceStats::GetTotalCovar(), CovarianceStats::GetWithinCovar(), CovarianceStats::Info(), and CovarianceStats::SingularTotCovar().

tot_covar_

SpMatrix<double> tot_covar_

private

Definition at line 76 of file ivector-compute-lda.cc.

Referenced by CovarianceStats::AccStats(), CovarianceStats::AddStats(), CovarianceStats::Dim(), CovarianceStats::GetTotalCovar(), and CovarianceStats::GetWithinCovar().

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The documentation for this class was generated from the following file:

• ivectorbin/ivector-compute-lda.cc