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RetrievalMethod Class Reference

#include <RetrievalMethod.hpp>

Inheritance diagram for RetrievalMethod:

List of all members.

Public Methods
	RetrievalMethod (Index &collectionIndex)
virtual	~RetrievalMethod ()
virtual QueryRep*	computeQueryRep (Query &qry)=0
	compute the representation for a query, semantics defined by subclass.
virtual double	scoreDoc (QueryRep &qry,int docID)=0
	Score a document identified by the id w.r.t. a query rep.
virtual void	scoreDocSet (QueryRep &qry,DocIDSet &docSet,IndexedRealVector &results)
	Score a set of documents w.r.t. a query rep (e.g. for re-ranking). More...
virtual void	scoreCollection (QueryRep &qry,IndexedRealVector &results)
	Score all documents in the collection. More...
virtual void	updateQuery (QueryRep &qryRep,DocIDSet &relDocs)=0
	update the query, feedback support.
Protected Attributes
Index&	ind

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Detailed Description

A retrieval method is determined by specifying the following elements

• A method to compute the query representation
• A method to score a document w.r.t. a query representation
• A method to score all the documents in the collection w.r.t. a query representation
• A method to update the query representation based on a set of (relevant) documents

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Constructor & Destructor Documentation

RetrievalMethod::RetrievalMethod ( Index & collectionIndex ) [inline]

RetrievalMethod::~RetrievalMethod ( ) [inline, virtual]

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Member Function Documentation

QueryRep * RetrievalMethod::computeQueryRep ( Query & qry ) [pure virtual]

compute the representation for a query, semantics defined by subclass. Reimplemented in TextQueryRetMethod.

void RetrievalMethod::scoreCollection ( QueryRep & qry, IndexedRealVector & results ) [virtual]

Score all documents in the collection. The default implementation provided by this class is to call function scoreDoc, thus to score documents one by one. This is inefficient, so usually a subclass should override this method if a more efficient scoring, e.g., based on inverted index, is possible. Reimplemented in TextQueryRetMethod.

double RetrievalMethod::scoreDoc ( QueryRep & qry, int docID ) [pure virtual]

Score a document identified by the id w.r.t. a query rep. Reimplemented in TextQueryRetMethod.

void RetrievalMethod::scoreDocSet ( QueryRep & qry, DocIDSet & docSet, IndexedRealVector & results ) [virtual]

Score a set of documents w.r.t. a query rep (e.g. for re-ranking). The default implementation provided by this class is to call function scoreDoc

void RetrievalMethod::updateQuery ( QueryRep & qryRep, DocIDSet & relDocs ) [pure virtual]

update the query, feedback support. Reimplemented in TextQueryRetMethod.

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Member Data Documentation

Index & RetrievalMethod::ind [protected]

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

• RetrievalMethod.hpp
• RetrievalMethod.cpp

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