Extracts n-gram features for candidate hypotheses on the fly. More...

Inheritance diagram for reranker::NgramFeatureExtractor:

Public Member Functions
	NgramFeatureExtractor ()
	Constructs an instance. More...

virtual	~NgramFeatureExtractor ()
	Destroys this instance. More...

virtual void	RegisterInitializers (Initializers &initializers)
	Registers two variables that may be initialized when this object is constructed via Factory::CreateOrDie. More...

virtual void	Extract (Candidate &candidate, FeatureVector< int, double > &features)
	Does nothing. More...

virtual void	ExtractSymbolic (Candidate &candidate, FeatureVector< string, double > &symbolic_features)
	Extracts n-gram features according to the n-gram order specified via the Init method. More...

Public Member Functions inherited from reranker::FeatureExtractor
	FeatureExtractor ()
	Constructs an empty feature vector. More...

virtual	~FeatureExtractor ()
	Destroys this vector. More...

virtual void	Reset ()
	Indicates to this instance that iteration over candidate sets on which features are being extracted has been reset. More...

virtual void	Extract (CandidateSet &candidate_set)
	Extracts features for all the candidates in the specified CandidateSet. More...

Public Member Functions inherited from reranker::FactoryConstructible
virtual	~FactoryConstructible ()

virtual void	Init (const Environment *env, const string &arg)

Detailed Description

Extracts n-gram features for candidate hypotheses on the fly.

Definition at line 67 of file ngram-feature-extractor.H.

Constructor & Destructor Documentation

reranker::NgramFeatureExtractor::NgramFeatureExtractor ( )

inline

Constructs an instance.

Definition at line 70 of file ngram-feature-extractor.H.

virtual reranker::NgramFeatureExtractor::~NgramFeatureExtractor ( )

inlinevirtual

Destroys this instance.

Definition at line 72 of file ngram-feature-extractor.H.

virtual void reranker::NgramFeatureExtractor::Extract	(	Candidate &	candidate,
		FeatureVector< int, double > &	features
	)

inlinevirtual

Does nothing.

Definition at line 108 of file ngram-feature-extractor.H.

void reranker::NgramFeatureExtractor::ExtractSymbolic	(	Candidate &	candidate,
		FeatureVector< string, double > &	symbolic_features
	)

virtual

Extracts n-gram features according to the n-gram order specified via the Init method.

Parameters

[in]	candidate	the candidate for which to extract features
[out]	symbolic_features	the features extracted for the specified candidate

Definition at line 75 of file ngram-feature-extractor.C.

virtual void reranker::NgramFeatureExtractor::RegisterInitializers ( Initializers & initializers )

inlinevirtual

Registers two variables that may be initialized when this object is constructed via Factory::CreateOrDie.

Variable name	Type	Required	Description	Default value
`n`	`int`	Yes	The n-gram order for this feature extractor to extract.	n/a
`prefix`	`string`	No	A prefix string to be prepended to each feature name produced.	n + `"g_ng"` where n is the string representation of the n-gram order

Definition at line 101 of file ngram-feature-extractor.H.

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