SingleUtteranceNnet2Decoder Class Reference

You will instantiate this class when you want to decode a single utterance using the online-decoding setup for neural nets. More...

#include <online-nnet2-decoding.h>

Collaboration diagram for SingleUtteranceNnet2Decoder:

Public Member Functions
	SingleUtteranceNnet2Decoder (const OnlineNnet2DecodingConfig &config, const TransitionModel &tmodel, const nnet2::AmNnet &model, const fst::Fst< fst::StdArc > &fst, OnlineFeatureInterface *feature_pipeline)
void	AdvanceDecoding ()
	advance the decoding as far as we can. More...
void	FinalizeDecoding ()
	Finalizes the decoding. More...
int32	NumFramesDecoded () const
void	GetLattice (bool end_of_utterance, CompactLattice *clat) const
	Gets the lattice. More...
void	GetBestPath (bool end_of_utterance, Lattice *best_path) const
	Outputs an FST corresponding to the single best path through the current lattice. More...
bool	EndpointDetected (const OnlineEndpointConfig &config)
	This function calls EndpointDetected from online-endpoint.h, with the required arguments. More...
const LatticeFasterOnlineDecoder &	Decoder () const
	~SingleUtteranceNnet2Decoder ()

Private Attributes
OnlineNnet2DecodingConfig	config_
OnlineFeatureInterface *	feature_pipeline_
const TransitionModel &	tmodel_
nnet2::DecodableNnet2Online	decodable_
LatticeFasterOnlineDecoder	decoder_

Detailed Description

You will instantiate this class when you want to decode a single utterance using the online-decoding setup for neural nets.

Definition at line 67 of file online-nnet2-decoding.h.

Constructor & Destructor Documentation

SingleUtteranceNnet2Decoder()

SingleUtteranceNnet2Decoder	(	const OnlineNnet2DecodingConfig &	config,
		const TransitionModel &	tmodel,
		const nnet2::AmNnet &	model,
		const fst::Fst< fst::StdArc > &	fst,
		OnlineFeatureInterface *	feature_pipeline
	)

Definition at line 26 of file online-nnet2-decoding.cc.

References SingleUtteranceNnet2Decoder::decoder_, and LatticeFasterDecoderTpl< FST, Token >::InitDecoding().

                                             :
    config_(config),
    feature_pipeline_(feature_pipeline),
    tmodel_(tmodel),
    decodable_(model, tmodel, config.decodable_opts, feature_pipeline),
    decoder_(fst, config.decoder_opts) {
  decoder_.InitDecoding();
}

~SingleUtteranceNnet2Decoder()

~SingleUtteranceNnet2Decoder ( )

inline

Definition at line 109 of file online-nnet2-decoding.h.

{ }

Member Function Documentation

AdvanceDecoding()

void AdvanceDecoding

(

)

advance the decoding as far as we can.

Definition at line 40 of file online-nnet2-decoding.cc.

References LatticeFasterDecoderTpl< FST, Token >::AdvanceDecoding(), SingleUtteranceNnet2Decoder::decodable_, and SingleUtteranceNnet2Decoder::decoder_.

Referenced by main().

                                                  {
  decoder_.AdvanceDecoding(&decodable_);
}

Decoder()

const LatticeFasterOnlineDecoder& Decoder ( ) const

inline

Definition at line 107 of file online-nnet2-decoding.h.

Referenced by main().

{ return decoder_; }

EndpointDetected()

bool EndpointDetected

(

const OnlineEndpointConfig &

config

)

This function calls EndpointDetected from online-endpoint.h, with the required arguments.

Definition at line 72 of file online-nnet2-decoding.cc.

References SingleUtteranceNnet2Decoder::decoder_, kaldi::EndpointDetected(), SingleUtteranceNnet2Decoder::feature_pipeline_, OnlineFeatureInterface::FrameShiftInSeconds(), and SingleUtteranceNnet2Decoder::tmodel_.

Referenced by main().

                                        {
  return kaldi::EndpointDetected(config, tmodel_,
                                 feature_pipeline_->FrameShiftInSeconds(),
                                 decoder_);  
}

FinalizeDecoding()

void FinalizeDecoding

(

)

Finalizes the decoding.

Cleans up and prunes remaining tokens, so the GetLattice() call will return faster. You must not call this before calling (TerminateDecoding() or InputIsFinished()) and then Wait().

Definition at line 44 of file online-nnet2-decoding.cc.

References SingleUtteranceNnet2Decoder::decoder_, and LatticeFasterDecoderTpl< FST, Token >::FinalizeDecoding().

Referenced by main().

                                                   {
  decoder_.FinalizeDecoding();
}

GetBestPath()

void GetBestPath	(	bool	end_of_utterance,
		Lattice *	best_path
	)		const

Outputs an FST corresponding to the single best path through the current lattice.

If "use_final_probs" is true AND we reached the final-state of the graph then it will include those as final-probs, else it will treat all final-probs as one.

Definition at line 67 of file online-nnet2-decoding.cc.

References SingleUtteranceNnet2Decoder::decoder_, and LatticeFasterOnlineDecoderTpl< FST >::GetBestPath().

                                                                        {
  decoder_.GetBestPath(best_path, end_of_utterance);
}

GetLattice()

void GetLattice	(	bool	end_of_utterance,
		CompactLattice *	clat
	)		const

Gets the lattice.

The output lattice has any acoustic scaling in it (which will typically be desirable in an online-decoding context); if you want an un-scaled lattice, scale it using ScaleLattice() with the inverse of the acoustic weight. "end_of_utterance" will be true if you want the final-probs to be included.

Definition at line 52 of file online-nnet2-decoding.cc.

References SingleUtteranceNnet2Decoder::config_, SingleUtteranceNnet2Decoder::decoder_, OnlineNnet2DecodingConfig::decoder_opts, LatticeFasterDecoderConfig::det_opts, LatticeFasterDecoderConfig::determinize_lattice, fst::DeterminizeLatticePhonePrunedWrapper(), LatticeFasterDecoderTpl< FST, Token >::GetRawLattice(), KALDI_ERR, LatticeFasterDecoderConfig::lattice_beam, SingleUtteranceNnet2Decoder::NumFramesDecoded(), and SingleUtteranceNnet2Decoder::tmodel_.

Referenced by main().

                                                                         {
  if (NumFramesDecoded() == 0)
    KALDI_ERR << "You cannot get a lattice if you decoded no frames.";
  Lattice raw_lat;
  decoder_.GetRawLattice(&raw_lat, end_of_utterance);

  if (!config_.decoder_opts.determinize_lattice)
    KALDI_ERR << "--determinize-lattice=false option is not supported at the moment";

  BaseFloat lat_beam = config_.decoder_opts.lattice_beam;
  DeterminizeLatticePhonePrunedWrapper(
      tmodel_, &raw_lat, lat_beam, clat, config_.decoder_opts.det_opts);
}

NumFramesDecoded()

int32 NumFramesDecoded

(

)

const

Definition at line 48 of file online-nnet2-decoding.cc.

References SingleUtteranceNnet2Decoder::decoder_, and LatticeFasterDecoderTpl< FST, Token >::NumFramesDecoded().

Referenced by SingleUtteranceNnet2Decoder::GetLattice().

                                                          {
  return decoder_.NumFramesDecoded();
}

Member Data Documentation

config_

OnlineNnet2DecodingConfig config_

private

Definition at line 112 of file online-nnet2-decoding.h.

Referenced by SingleUtteranceNnet2Decoder::GetLattice().

decodable_

nnet2::DecodableNnet2Online decodable_

private

Definition at line 118 of file online-nnet2-decoding.h.

Referenced by SingleUtteranceNnet2Decoder::AdvanceDecoding().

decoder_

LatticeFasterOnlineDecoder decoder_

private

Definition at line 120 of file online-nnet2-decoding.h.

Referenced by SingleUtteranceNnet2Decoder::AdvanceDecoding(), SingleUtteranceNnet2Decoder::EndpointDetected(), SingleUtteranceNnet2Decoder::FinalizeDecoding(), SingleUtteranceNnet2Decoder::GetBestPath(), SingleUtteranceNnet2Decoder::GetLattice(), SingleUtteranceNnet2Decoder::NumFramesDecoded(), and SingleUtteranceNnet2Decoder::SingleUtteranceNnet2Decoder().

feature_pipeline_

OnlineFeatureInterface* feature_pipeline_

private

Definition at line 114 of file online-nnet2-decoding.h.

Referenced by SingleUtteranceNnet2Decoder::EndpointDetected().

tmodel_

const TransitionModel& tmodel_

private

Definition at line 116 of file online-nnet2-decoding.h.

Referenced by SingleUtteranceNnet2Decoder::EndpointDetected(), and SingleUtteranceNnet2Decoder::GetLattice().

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

• online2/online-nnet2-decoding.h
• online2/online-nnet2-decoding.cc