#include <decodable-am-sgmm2.h>

Inheritance diagram for DecodableAmSgmm2:

Collaboration diagram for DecodableAmSgmm2:

[legend]

Public Member Functions
	DecodableAmSgmm2 (const AmSgmm2 &sgmm, const TransitionModel &tm, const Matrix< BaseFloat > &feats, const std::vector< std::vector< int32 > > &gselect, BaseFloat log_prune, Sgmm2PerSpkDerivedVars *spk)

	DecodableAmSgmm2 (const AmSgmm2 &sgmm, const TransitionModel &tm, const Matrix< BaseFloat > feats, const std::vector< std::vector< int32 > > gselect, Sgmm2PerSpkDerivedVars *spk, BaseFloat log_prune)
	This version of the constructor takes ownership of the pointers "feats", "gselect" and "spk", and will delete them when it is destroyed. More...

virtual BaseFloat	LogLikelihood (int32 frame, int32 tid)
	Returns the log likelihood, which will be negated in the decoder. More...

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

virtual int32	NumIndices () const
	Returns the number of states in the acoustic model (they will be indexed one-based, i.e. More...

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

virtual	~DecodableAmSgmm2 ()

Public Member Functions inherited from DecodableInterface
virtual	~DecodableInterface ()

Protected Member Functions
virtual BaseFloat	LogLikelihoodForPdf (int32 frame, int32 pdf_id)

Protected Attributes
const AmSgmm2 &	sgmm_

Sgmm2PerSpkDerivedVars *	spk_

const TransitionModel &	trans_model_
	for tid to pdf mapping More...

const Matrix< BaseFloat > *	feature_matrix_

const std::vector< std::vector< int32 > > *	gselect_

BaseFloat	log_prune_

int32	cur_frame_

Sgmm2PerFrameDerivedVars	per_frame_vars_

Sgmm2LikelihoodCache	sgmm_cache_

bool	delete_vars_

Private Member Functions
	KALDI_DISALLOW_COPY_AND_ASSIGN (DecodableAmSgmm2)

Detailed Description

Definition at line 33 of file decodable-am-sgmm2.h.

Constructor & Destructor Documentation

◆ DecodableAmSgmm2() [1/2]

DecodableAmSgmm2	(	const AmSgmm2 &	sgmm,
		const TransitionModel &	tm,
		const Matrix< BaseFloat > &	feats,
		const std::vector< std::vector< int32 > > &	gselect,
		BaseFloat	log_prune,
		Sgmm2PerSpkDerivedVars *	spk
	)

inline

Definition at line 35 of file decodable-am-sgmm2.h.

References KALDI_ASSERT, and MatrixBase< Real >::NumRows().

                                                :
       sgmm_(sgmm), spk_(spk),
       trans_model_(tm), feature_matrix_(&feats),
       gselect_(&gselect), log_prune_(log_prune), cur_frame_(-1),
       sgmm_cache_(sgmm.NumGroups(), sgmm.NumPdfs()), delete_vars_(false) {
     KALDI_ASSERT(gselect.size() == static_cast<size_t>(feats.NumRows()));
   }

◆ DecodableAmSgmm2() [2/2]

DecodableAmSgmm2	(	const AmSgmm2 &	sgmm,
		const TransitionModel &	tm,
		const Matrix< BaseFloat > *	feats,
		const std::vector< std::vector< int32 > > *	gselect,
		Sgmm2PerSpkDerivedVars *	spk,
		BaseFloat	log_prune
	)

inline

This version of the constructor takes ownership of the pointers "feats", "gselect" and "spk", and will delete them when it is destroyed.

Definition at line 50 of file decodable-am-sgmm2.h.

References KALDI_ASSERT, and MatrixBase< Real >::NumRows().

                                        :
       sgmm_(sgmm), spk_(spk),
       trans_model_(tm), feature_matrix_(feats),
       gselect_(gselect), log_prune_(log_prune), cur_frame_(-1),
       sgmm_cache_(sgmm.NumGroups(), sgmm.NumPdfs()), delete_vars_(true) {
     KALDI_ASSERT(gselect->size() == static_cast<size_t>(feats->NumRows()));
   }

◆ ~DecodableAmSgmm2()

~DecodableAmSgmm2 ( )

virtual

Definition at line 29 of file decodable-am-sgmm2.cc.

References DecodableAmSgmm2::delete_vars_, DecodableAmSgmm2::feature_matrix_, DecodableAmSgmm2::gselect_, and DecodableAmSgmm2::spk_.

Referenced by DecodableAmSgmm2::IsLastFrame().

                                     {
   if (delete_vars_) {
     delete gselect_;
     delete feature_matrix_;
     delete spk_;
   }
 }

Member Function Documentation

◆ IsLastFrame()

virtual bool IsLastFrame ( int32 frame ) const

inlinevirtual

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 71 of file decodable-am-sgmm2.h.

References KALDI_ASSERT, DecodableAmSgmm2::LogLikelihoodForPdf(), DecodableAmSgmm2::NumFramesReady(), and DecodableAmSgmm2::~DecodableAmSgmm2().

                                               {
     KALDI_ASSERT(frame < NumFramesReady());
     return (frame == NumFramesReady() - 1);
   }

◆ KALDI_DISALLOW_COPY_AND_ASSIGN()

KALDI_DISALLOW_COPY_AND_ASSIGN ( DecodableAmSgmm2 )

private

◆ LogLikelihood()

virtual BaseFloat LogLikelihood	(	int32	frame,
		int32	index
	)

inlinevirtual

Returns the log likelihood, which will be negated in the decoder.

The "frame" starts from zero. You should verify that NumFramesReady() > frame before calling this.

Implements DecodableInterface.

Reimplemented in DecodableAmSgmm2Scaled.

Definition at line 65 of file decodable-am-sgmm2.h.

References DecodableAmSgmm2::LogLikelihoodForPdf(), DecodableAmSgmm2::trans_model_, and TransitionModel::TransitionIdToPdfFast().

                                                           {
     return LogLikelihoodForPdf(frame, trans_model_.TransitionIdToPdfFast(tid));
   }

◆ LogLikelihoodForPdf()

BaseFloat LogLikelihoodForPdf	(	int32	frame,
		int32	pdf_id
	)

protectedvirtual

Definition at line 37 of file decodable-am-sgmm2.cc.

References AmSgmm2::ComputePerFrameVars(), DecodableAmSgmm2::cur_frame_, DecodableAmSgmm2::feature_matrix_, DecodableAmSgmm2::gselect_, DecodableAmSgmm2::log_prune_, AmSgmm2::LogLikelihood(), Sgmm2LikelihoodCache::NextFrame(), DecodableAmSgmm2::per_frame_vars_, DecodableAmSgmm2::sgmm_, DecodableAmSgmm2::sgmm_cache_, and DecodableAmSgmm2::spk_.

Referenced by DecodableAmSgmm2::IsLastFrame(), DecodableAmSgmm2::LogLikelihood(), and DecodableAmSgmm2Scaled::LogLikelihood().

                                                                          {
   if (frame != cur_frame_) {
     cur_frame_ = frame;
     sgmm_cache_.NextFrame(); // it has a frame-index internally but it doesn't
     // have to match up with our index here, it just needs to be unique.
 
 
     SubVector<BaseFloat> data(*feature_matrix_, frame);
     
     sgmm_.ComputePerFrameVars(data, (*gselect_)[frame], *spk_,
                               &per_frame_vars_);
   }
   return sgmm_.LogLikelihood(per_frame_vars_, pdf_id, &sgmm_cache_, spk_,
                              log_prune_);  
 }

◆ NumFramesReady()

int32 NumFramesReady ( ) const

inlinevirtual

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 68 of file decodable-am-sgmm2.h.

References DecodableAmSgmm2::feature_matrix_, and MatrixBase< Real >::NumRows().

Referenced by DecodableAmSgmm2::IsLastFrame().

68 { return feature_matrix_->NumRows(); }

kaldi::DecodableAmSgmm2::feature_matrix_

const Matrix< BaseFloat > * feature_matrix_

Definition: decodable-am-sgmm2.h:83

kaldi::MatrixBase::NumRows

MatrixIndexT NumRows() const

Returns number of rows (or zero for empty matrix).

Definition: kaldi-matrix.h:64