reranker::ExampleFeatureExtractor Class Reference

This class illustrates how to write a FeatureExtractor implementation. More...

#include <example-feature-extractor.H>

Inheritance diagram for reranker::ExampleFeatureExtractor:

Public Member Functions
	ExampleFeatureExtractor ()
	Constructs an instance, emitting that fact to cout. More...
virtual	~ExampleFeatureExtractor ()
	Destroys this instance. More...
virtual void	RegisterInitializers (Initializers &initializers)
virtual void	Init (const Environment *env, const string &arg)
	Initializes this instance with the specified argument string. More...
virtual void	Extract (Candidate &candidate, FeatureVector< int, double > &features)
	Extracts “compiled” features. More...
virtual void	ExtractSymbolic (Candidate &candidate, FeatureVector< string, double > &symbolic_features)
	Extracts symbolic (or string) features. 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 ()

Detailed Description

This class illustrates how to write a FeatureExtractor implementation.

Implementation advice:

Most implementations are likely only to have to worry about implementing the ExtractSymbolic method, implementing the Extract method to do nothing.

Definition at line 59 of file example-feature-extractor.H.

Constructor & Destructor Documentation

reranker::ExampleFeatureExtractor::ExampleFeatureExtractor ( )

inline

Constructs an instance, emitting that fact to cout.

Definition at line 62 of file example-feature-extractor.H.

virtual reranker::ExampleFeatureExtractor::~ExampleFeatureExtractor ( )

inlinevirtual

Destroys this instance.

Definition at line 66 of file example-feature-extractor.H.

Member Function Documentation

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

inlinevirtual

Extracts “compiled” features.

Implementation advice:

Most implementations of the FeatureExtractor interface will likely implement either this method or the ExtractSymbolic method, but not both. In fact, most implementations will likely only implement the ExtractSymbolic method.

Parameters

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

Implements reranker::FeatureExtractor.

Definition at line 109 of file example-feature-extractor.H.

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

inlinevirtual

Extracts symbolic (or string) features.

Parameters

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

Implements reranker::FeatureExtractor.

Definition at line 120 of file example-feature-extractor.H.

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

inlinevirtual

Initializes this instance with the specified argument string.

This method is guaranteed to be invoked by a Factory just after construction.

Parameters

env	the environment used by the Factory when this object was constructed
arg	the argument string with which to initialize this instance

See Also

Factory::Create(const string&,string&,string&,bool&,bool&)

Reimplemented from reranker::FactoryConstructible.

Definition at line 83 of file example-feature-extractor.H.

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

inlinevirtual

Reimplemented from reranker::FactoryConstructible.

Definition at line 68 of file example-feature-extractor.H.

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

• example-feature-extractor.H