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RetrievalMethod Class Reference

#include <RetrievalMethod.hpp>

Inheritance diagram for RetrievalMethod:

List of all members.

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

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

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Member Function Documentation

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

compute the representation for a query, semantics defined by subclass Implemented in IndriRetMethod, StructQueryRetMethod, TextQueryRetMethod, and XLingRetMethod.

void RetrievalMethod::scoreCollection (  const 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 CORIRetMethod, IndriRetMethod, StructQueryRetMethod, TextQueryRetMethod, and XLingRetMethod.

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

Score a document identified by the id w.r.t. a query rep. Implemented in IndriRetMethod, StructQueryRetMethod, TextQueryRetMethod, and XLingRetMethod.

void RetrievalMethod::scoreDocSet (  const QueryRep &    qry, const 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 Reimplemented in IndriRetMethod.

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

update the query, feedback support Implemented in IndriRetMethod, StructQueryRetMethod, TextQueryRetMethod, and XLingRetMethod.

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Member Data Documentation

const 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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