---

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).
virtual void	scoreCollection (QueryRep &qry, IndexedRealVector &results)
	Score all documents in the collection.
virtual void	updateQuery (QueryRep &qryRep, DocIDSet &relDocs)=0
	update the query, feedback support
Protected Attributes
Index &	ind

---

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

---

Constructor & Destructor Documentation

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

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

---

Member Function Documentation

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

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

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

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

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

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

---

Member Data Documentation

Index& RetrievalMethod::ind [protected]

---

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

• RetrievalMethod.hpp
• RetrievalMethod.cpp

---