A “feature extractor” that reads lines from a backing file, setting each candidate’s loss via its Candidate::set_loss method. More...

#include <file-backed-loss-setter.H>

Inheritance diagram for reranker::FileBackedLossSetter:

Public Member Functions
	FileBackedLossSetter ()
	Constructs a new instance. More...

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

virtual void	RegisterInitializers (Initializers &initializers)
	Registers the initializers for the filename_ and token_idx_ members. More...

virtual void	Init (const Environment *env, const string &arg)
	Initializes this instance. More...

virtual void	Extract (Candidate &candidate, FeatureVector< int, double > &features)
	Sets the loss for the specified candidate based on what was read from the last line in the stream backing this FeatureExtractor instance. More...

virtual void	ExtractSymbolic (Candidate &candidate, FeatureVector< string, double > &symbolic_features)
	Overridden to do nothing. More...

Public Member Functions inherited from reranker::AbstractFileBackedFeatureExtractor
	AbstractFileBackedFeatureExtractor ()
	Constructs an instance. More...

virtual	~AbstractFileBackedFeatureExtractor ()
	Destroys this instance. 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...

virtual long	line_number () const
	Returns the current number of lines read by this feature extractor from the underlying stream. More...

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

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

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

Additional Inherited Members
Protected Member Functions inherited from reranker::AbstractFileBackedFeatureExtractor
virtual void	ReadFromStream ()
	Reads from the stream. More...

Protected Attributes inherited from reranker::AbstractFileBackedFeatureExtractor
string	filename_
	The name of the file backing this feature extractor. More...

istream *	is_
	The stream created from the file backing this feature extractor. More...

string	line_
	The last line read by this feature extractor. More...

long	line_number_
	The number of lines read so far by this feature extractor. More...

Tokenizer	tokenizer_
	A simple whitespace tokenizer for use by concrete subclasses. More...

Detailed Description

A “feature extractor” that reads lines from a backing file, setting each candidate’s loss via its Candidate::set_loss method.

Definition at line 52 of file file-backed-loss-setter.H.

Constructor & Destructor Documentation

reranker::FileBackedLossSetter::FileBackedLossSetter ( )

inline

Constructs a new instance.

Definition at line 55 of file file-backed-loss-setter.H.

virtual reranker::FileBackedLossSetter::~FileBackedLossSetter ( )

inlinevirtual

Destroys this instance.

Definition at line 58 of file file-backed-loss-setter.H.

Member Function Documentation

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

virtual

Sets the loss for the specified candidate based on what was read from the last line in the stream backing this FeatureExtractor instance.

Implements reranker::AbstractFileBackedFeatureExtractor.

Definition at line 48 of file file-backed-loss-setter.C.

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

inlinevirtual

Overridden to do nothing.

Implements reranker::AbstractFileBackedFeatureExtractor.

Definition at line 84 of file file-backed-loss-setter.H.

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

inlinevirtual

Initializes this instance.

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

Parameters

env	the environment just after initializing this object
arg	ignored

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

Reimplemented from reranker::AbstractFileBackedFeatureExtractor.

Definition at line 74 of file file-backed-loss-setter.H.

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

inlinevirtual

Registers the initializers for the filename_ and token_idx_ members.

Reimplemented from reranker::AbstractFileBackedFeatureExtractor.

Definition at line 61 of file file-backed-loss-setter.H.

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

Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation