#include <online-gmm-decodable.h>

Inheritance diagram for DecodableDiagGmmScaledOnline:

Collaboration diagram for DecodableDiagGmmScaledOnline:

[legend]

Public Member Functions
	DecodableDiagGmmScaledOnline (const AmDiagGmm &am, const TransitionModel &trans_model, const BaseFloat scale, OnlineFeatureInterface *input_feats)

virtual BaseFloat	LogLikelihood (int32 frame, int32 index)
	Returns the scaled log likelihood. More...

virtual bool	IsLastFrame (int32 frame) const
	Returns true if this is the last frame. More...

virtual int32	NumFramesReady () const
	The call NumFramesReady() will return the number of frames currently available for this decodable object. More...

virtual int32	NumIndices () const
	Indices are one-based! This is for compatibility with OpenFst. More...

Public Member Functions inherited from DecodableInterface
virtual	~DecodableInterface ()

Private Member Functions
void	CacheFrame (int32 frame)

	KALDI_DISALLOW_COPY_AND_ASSIGN (DecodableDiagGmmScaledOnline)

Private Attributes
OnlineFeatureInterface *	features_

const AmDiagGmm &	ac_model_

BaseFloat	ac_scale_

const TransitionModel &	trans_model_

const int32	feat_dim_

Vector< BaseFloat >	cur_feats_

int32	cur_frame_

std::vector< std::pair< int32, BaseFloat > >	cache_

Detailed Description

Definition at line 35 of file online-gmm-decodable.h.

Constructor & Destructor Documentation

◆ DecodableDiagGmmScaledOnline()

DecodableDiagGmmScaledOnline	(	const AmDiagGmm &	am,
		const TransitionModel &	trans_model,
		const BaseFloat	scale,
		OnlineFeatureInterface *	input_feats
	)

Definition at line 26 of file online-gmm-decodable.cc.

References DecodableDiagGmmScaledOnline::cache_, TransitionModel::NumPdfs(), and DecodableDiagGmmScaledOnline::trans_model_.

                                                                :  
       features_(input_feats), ac_model_(am),
       ac_scale_(scale), trans_model_(trans_model),
       feat_dim_(input_feats->Dim()), cur_feats_(feat_dim_),
       cur_frame_(-1) {
   int32 num_pdfs = trans_model_.NumPdfs();
   cache_.resize(num_pdfs, std::pair<int32,BaseFloat>(-1, 0.0f));
 }

Member Function Documentation

◆ CacheFrame()

void CacheFrame ( int32 frame )

private

Definition at line 37 of file online-gmm-decodable.cc.

References DecodableDiagGmmScaledOnline::cur_feats_, DecodableDiagGmmScaledOnline::cur_frame_, DecodableDiagGmmScaledOnline::features_, and OnlineFeatureInterface::GetFrame().

Referenced by DecodableDiagGmmScaledOnline::LogLikelihood(), and DecodableDiagGmmScaledOnline::NumIndices().

                                                          {
   // The call below will fail if "frame" is an invalid index, i.e. <0
   // or >= features_->NumFramesReady(), so there
   // is no need to check again.
   features_->GetFrame(frame, &cur_feats_);
   cur_frame_ = frame;
 }

◆ IsLastFrame()

bool IsLastFrame ( int32 frame ) const

virtual

Returns true if this is the last frame.

Frames are zero-based, so the first frame is zero. IsLastFrame(-1) will return false, unless the file is empty (which is a case that I'm not sure all the code will handle, so be careful). Caution: the behavior of this function in an online setting is being changed somewhat. In future it may return false in cases where we haven't yet decided to terminate decoding, but later true if we decide to terminate decoding. The plan in future is to rely more on NumFramesReady(), and in future, IsLastFrame() would always return false in an online-decoding setting, and would only return true in a decoding-from-matrix setting where we want to allow the last delta or LDA features to be flushed out for compatibility with the baseline setup.

Implements DecodableInterface.

Definition at line 58 of file online-gmm-decodable.cc.

References DecodableDiagGmmScaledOnline::features_, and OnlineFeatureInterface::IsLastFrame().

                                                                 {
   return features_->IsLastFrame(frame);
 }

◆ KALDI_DISALLOW_COPY_AND_ASSIGN()

KALDI_DISALLOW_COPY_AND_ASSIGN ( DecodableDiagGmmScaledOnline )

private

◆ LogLikelihood()

BaseFloat LogLikelihood	(	int32	frame,
		int32	index
	)

virtual

Returns the scaled log likelihood.

Implements DecodableInterface.

Definition at line 45 of file online-gmm-decodable.cc.

References DecodableDiagGmmScaledOnline::ac_model_, DecodableDiagGmmScaledOnline::ac_scale_, DecodableDiagGmmScaledOnline::cache_, DecodableDiagGmmScaledOnline::CacheFrame(), DecodableDiagGmmScaledOnline::cur_feats_, DecodableDiagGmmScaledOnline::cur_frame_, AmDiagGmm::LogLikelihood(), DecodableDiagGmmScaledOnline::trans_model_, and TransitionModel::TransitionIdToPdf().

                                                                               {
   if (frame != cur_frame_)
     CacheFrame(frame);
   int32 pdf_id = trans_model_.TransitionIdToPdf(index);
   if (cache_[pdf_id].first == frame)
     return cache_[pdf_id].second;
   BaseFloat ans = ac_model_.LogLikelihood(pdf_id, cur_feats_) * ac_scale_;
   cache_[pdf_id].first = frame;
   cache_[pdf_id].second = ans;
   return ans;
 }

◆ NumFramesReady()

int32 NumFramesReady ( ) const

virtual

The call NumFramesReady() will return the number of frames currently available for this decodable object.

This is for use in setups where you don't want the decoder to block while waiting for input. This is newly added as of Jan 2014, and I hope, going forward, to rely on this mechanism more than IsLastFrame to know when to stop decoding.

Reimplemented from DecodableInterface.

Definition at line 62 of file online-gmm-decodable.cc.

References DecodableDiagGmmScaledOnline::features_, and OnlineFeatureInterface::NumFramesReady().

                                                          {
   return features_->NumFramesReady();
 }

◆ NumIndices()

virtual int32 NumIndices ( ) const

inlinevirtual

Indices are one-based! This is for compatibility with OpenFst.

Implements DecodableInterface.

Definition at line 51 of file online-gmm-decodable.h.

References DecodableDiagGmmScaledOnline::CacheFrame(), TransitionModel::NumTransitionIds(), and DecodableDiagGmmScaledOnline::trans_model_.

51 { return trans_model_.NumTransitionIds(); }

kaldi::DecodableDiagGmmScaledOnline::trans_model_

const TransitionModel & trans_model_

Definition: online-gmm-decodable.h:59

kaldi::TransitionModel::NumTransitionIds

int32 NumTransitionIds() const

Returns the total number of transition-ids (note, these are one-based).

Definition: transition-model.h:175

Member Data Documentation

◆ ac_model_

const AmDiagGmm& ac_model_

private

Definition at line 57 of file online-gmm-decodable.h.

Referenced by DecodableDiagGmmScaledOnline::LogLikelihood().

◆ ac_scale_

BaseFloat ac_scale_

private

Definition at line 58 of file online-gmm-decodable.h.

Referenced by DecodableDiagGmmScaledOnline::LogLikelihood().

◆ cache_

std::vector<std::pair<int32, BaseFloat> > cache_

private

Definition at line 63 of file online-gmm-decodable.h.

Referenced by DecodableDiagGmmScaledOnline::DecodableDiagGmmScaledOnline(), and DecodableDiagGmmScaledOnline::LogLikelihood().

◆ cur_feats_

Vector<BaseFloat> cur_feats_

private

Definition at line 61 of file online-gmm-decodable.h.

Referenced by DecodableDiagGmmScaledOnline::CacheFrame(), and DecodableDiagGmmScaledOnline::LogLikelihood().

◆ cur_frame_

int32 cur_frame_

private

Definition at line 62 of file online-gmm-decodable.h.

Referenced by DecodableDiagGmmScaledOnline::CacheFrame(), and DecodableDiagGmmScaledOnline::LogLikelihood().

◆ feat_dim_

const int32 feat_dim_

private

Definition at line 60 of file online-gmm-decodable.h.

◆ features_

OnlineFeatureInterface* features_

private

Definition at line 56 of file online-gmm-decodable.h.

Referenced by DecodableDiagGmmScaledOnline::CacheFrame(), DecodableDiagGmmScaledOnline::IsLastFrame(), and DecodableDiagGmmScaledOnline::NumFramesReady().

◆ trans_model_

const TransitionModel& trans_model_

private

Definition at line 59 of file online-gmm-decodable.h.

Referenced by DecodableDiagGmmScaledOnline::DecodableDiagGmmScaledOnline(), DecodableDiagGmmScaledOnline::LogLikelihood(), and DecodableDiagGmmScaledOnline::NumIndices().

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

online2/online-gmm-decodable.h
online2/online-gmm-decodable.cc

Public Member Functions

Private Member Functions

Private Attributes

Detailed Description

Constructor & Destructor Documentation

◆ DecodableDiagGmmScaledOnline()

Member Function Documentation

◆ CacheFrame()

◆ IsLastFrame()

◆ KALDI_DISALLOW_COPY_AND_ASSIGN()

◆ LogLikelihood()

◆ NumFramesReady()

◆ NumIndices()

Member Data Documentation

◆ ac_model_

◆ ac_scale_

◆ cache_

◆ cur_feats_

◆ cur_frame_

◆ feat_dim_

◆ features_

◆ trans_model_