This class stores the adaptation state from the online iVector extractor, which can help you to initialize the adaptation state for the next utterance of the same speaker in a more informed way. More...

#include <online-ivector-feature.h>

Collaboration diagram for OnlineIvectorExtractorAdaptationState:

[legend]

Public Member Functions
	OnlineIvectorExtractorAdaptationState (const OnlineIvectorExtractionInfo &info)
	This constructor initializes adaptation-state with no prior speaker history. More...

	OnlineIvectorExtractorAdaptationState (const OnlineIvectorExtractorAdaptationState &other)
	Copy constructor. More...

void	LimitFrames (BaseFloat max_remembered_frames, BaseFloat posterior_scale)
	Scales down the stats if needed to ensure the number of frames in the speaker-specific CMVN stats does not exceed max_remembered_frames and the data-count in the iVector stats does not exceed max_remembered_frames * posterior_scale. More...

void	Write (std::ostream &os, bool binary) const

void	Read (std::istream &is, bool binary)

Public Attributes
OnlineCmvnState	cmvn_state

OnlineIvectorEstimationStats	ivector_stats
	Stats for online iVector estimation. More...

Detailed Description

This class stores the adaptation state from the online iVector extractor, which can help you to initialize the adaptation state for the next utterance of the same speaker in a more informed way.

Definition at line 211 of file online-ivector-feature.h.

Constructor & Destructor Documentation

◆ OnlineIvectorExtractorAdaptationState() [1/2]

OnlineIvectorExtractorAdaptationState ( const OnlineIvectorExtractionInfo & info )

inline

This constructor initializes adaptation-state with no prior speaker history.

Definition at line 223 of file online-ivector-feature.h.

References OnlineIvectorExtractionConfig::max_remembered_frames, and OnlineIvectorExtractionConfig::posterior_scale.

                                                                                 :
       cmvn_state(info.global_cmvn_stats),
       ivector_stats(info.extractor.IvectorDim(),
                     info.extractor.PriorOffset(),
                     info.max_count) { }

◆ OnlineIvectorExtractorAdaptationState() [2/2]

OnlineIvectorExtractorAdaptationState ( const OnlineIvectorExtractorAdaptationState & other )

Copy constructor.

Definition at line 104 of file online-ivector-feature.cc.

105 :

106 cmvn_state(other.cmvn_state), ivector_stats(other.ivector_stats) { }

kaldi::OnlineIvectorExtractorAdaptationState::cmvn_state

OnlineCmvnState cmvn_state

Definition: online-ivector-feature.h:217

kaldi::OnlineIvectorExtractorAdaptationState::ivector_stats

OnlineIvectorEstimationStats ivector_stats

Stats for online iVector estimation.

Definition: online-ivector-feature.h:220

Member Function Documentation

◆ LimitFrames()

void LimitFrames	(	BaseFloat	max_remembered_frames,
		BaseFloat	posterior_scale
	)

Scales down the stats if needed to ensure the number of frames in the speaker-specific CMVN stats does not exceed max_remembered_frames and the data-count in the iVector stats does not exceed max_remembered_frames * posterior_scale.

[the posterior_scale factor is necessary because those stats have already been scaled by that factor.]

Definition at line 109 of file online-ivector-feature.cc.

References OnlineIvectorExtractorAdaptationState::cmvn_state, count, OnlineIvectorEstimationStats::Count(), OnlineCmvnState::frozen_state, OnlineIvectorExtractorAdaptationState::ivector_stats, KALDI_ASSERT, MatrixBase< Real >::NumCols(), MatrixBase< Real >::NumRows(), MatrixBase< Real >::Scale(), OnlineIvectorEstimationStats::Scale(), and OnlineCmvnState::speaker_cmvn_stats.

Referenced by OnlineIvectorFeature::GetAdaptationState().

                                                                 {
   KALDI_ASSERT(max_remembered_frames >= 0);
   KALDI_ASSERT(cmvn_state.frozen_state.NumRows() == 0);
   if (cmvn_state.speaker_cmvn_stats.NumRows() != 0) {
     int32 feat_dim = cmvn_state.speaker_cmvn_stats.NumCols() - 1;
     BaseFloat count = cmvn_state.speaker_cmvn_stats(0, feat_dim);
     if (count > max_remembered_frames)
       cmvn_state.speaker_cmvn_stats.Scale(max_remembered_frames / count);
   }
   // the stats for the iVector have been scaled by info_.posterior_scale,
   // so we need to take this in account when setting the target count.
   BaseFloat max_remembered_frames_scaled =
       max_remembered_frames * posterior_scale;
   if (ivector_stats.Count() > max_remembered_frames_scaled) {
     ivector_stats.Scale(max_remembered_frames_scaled /
                         ivector_stats.Count());
   }
 }

◆ Read()

void Read	(	std::istream &	is,
		bool	binary
	)

Definition at line 138 of file online-ivector-feature.cc.

References OnlineIvectorExtractorAdaptationState::cmvn_state, kaldi::ExpectToken(), OnlineIvectorExtractorAdaptationState::ivector_stats, OnlineCmvnState::Read(), and OnlineIvectorEstimationStats::Read().

                                                                             {
   ExpectToken(is, binary, "<OnlineIvectorExtractorAdaptationState>");  // magic string.
   ExpectToken(is, binary, "<CmvnState>");
   cmvn_state.Read(is, binary);
   ExpectToken(is, binary, "<IvectorStats>");
   ivector_stats.Read(is, binary);
   ExpectToken(is, binary, "</OnlineIvectorExtractorAdaptationState>");
 }

◆ Write()

void Write	(	std::ostream &	os,
		bool	binary
	)		const

Definition at line 129 of file online-ivector-feature.cc.

References OnlineIvectorExtractorAdaptationState::cmvn_state, OnlineIvectorExtractorAdaptationState::ivector_stats, OnlineCmvnState::Write(), OnlineIvectorEstimationStats::Write(), and kaldi::WriteToken().

                                                                                    {
   WriteToken(os, binary, "<OnlineIvectorExtractorAdaptationState>");  // magic string.
   WriteToken(os, binary, "<CmvnState>");
   cmvn_state.Write(os, binary);
   WriteToken(os, binary, "<IvectorStats>");
   ivector_stats.Write(os, binary);
   WriteToken(os, binary, "</OnlineIvectorExtractorAdaptationState>");
 }