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SimpleKLRetMethod Class Reference

KL Divergence retrieval model with simple document model smoothing. More...

#include <SimpleKLRetMethod.hpp>

Inheritance diagram for SimpleKLRetMethod:

List of all members.

Public Methods
	SimpleKLRetMethod (Index &dbIndex,const char *supportFileName,ScoreAccumulator &accumulator)
	Construction of SimpleKLRetMethod requires a smoothing support file, which can be generated by the application GenerateSmoothSupport. The use of this smoothing support file is to store some pre-computed quantities so that the scoring procedure can be speeded up.
virtual	~SimpleKLRetMethod ()
virtual TextQueryRep*	computeTextQueryRep (TextQuery &qry)
	compute the query representation for a text query (caller responsible for deleting the memory of the generated new instance).
virtual DocumentRep*	computeDocRep (int docID)
	compute the doc representation (caller responsible for deleting the memory of the generated new instance).
virtual ScoreFunction*	scoreFunc ()
	return the scoring function pointer.
virtual void	updateTextQuery (TextQueryRep &origRep,DocIDSet &relDocs)
	Modify/update the query representation based on a set (presumably) relevant documents.
void	setDocSmoothParam (SimpleKLParameter::DocSmoothParam &docSmthParam)
void	setQueryModelParam (SimpleKLParameter::QueryModelParam &queryModParam)
Protected Methods
query model updating methods (i.e., feedback methods)
void	computeMixtureFBModel (SimpleKLQueryModel &origRep,DocIDSet &relDocs)
	Mixture model feedback method.
void	computeDivMinFBModel (SimpleKLQueryModel &origRep,DocIDSet &relDocs)
	Divergence minimization feedback method.
void	computeMarkovChainFBModel (SimpleKLQueryModel &origRep,DocIDSet &relDocs)
	Markov chain feedback method.
Protected Attributes
double*	mcNorm
	needed for fast one-step Markov chain.
double*	docProbMass
	needed for fast alpha computing.
int*	uniqueTermCount
	needed for supporting fast absolute discounting.
UnigramLM*	collectLM
	a little faster if pre-computed.
DocUnigramCounter*	collectLMCounter
	support the construction of collectLM.
SimpleKLScoreFunc*	scFunc
	keep a copy to be used at any time.
SimpleKLParameter::DocSmoothParam	docParam
SimpleKLParameter::QueryModelParam	qryParam

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Detailed Description

KL Divergence retrieval model with simple document model smoothing.

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Constructor & Destructor Documentation

SimpleKLRetMethod::SimpleKLRetMethod ( Index & dbIndex, const char * supportFileName, ScoreAccumulator & accumulator )

Construction of SimpleKLRetMethod requires a smoothing support file, which can be generated by the application GenerateSmoothSupport. The use of this smoothing support file is to store some pre-computed quantities so that the scoring procedure can be speeded up.

SimpleKLRetMethod::~SimpleKLRetMethod ( ) [virtual]

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Member Function Documentation

void SimpleKLRetMethod::computeDivMinFBModel ( SimpleKLQueryModel & origRep, DocIDSet & relDocs ) [protected]

Divergence minimization feedback method.

DocumentRep * SimpleKLRetMethod::computeDocRep ( int docID ) [virtual]

compute the doc representation (caller responsible for deleting the memory of the generated new instance). Reimplemented from TextQueryRetMethod.

void SimpleKLRetMethod::computeMarkovChainFBModel ( SimpleKLQueryModel & origRep, DocIDSet & relDocs ) [protected]

Markov chain feedback method.

void SimpleKLRetMethod::computeMixtureFBModel ( SimpleKLQueryModel & origRep, DocIDSet & relDocs ) [protected]

Mixture model feedback method.

TextQueryRep * SimpleKLRetMethod::computeTextQueryRep ( TextQuery & qry ) [inline, virtual]

compute the query representation for a text query (caller responsible for deleting the memory of the generated new instance). Reimplemented from TextQueryRetMethod.

ScoreFunction * SimpleKLRetMethod::scoreFunc ( ) [inline, virtual]

return the scoring function pointer. Reimplemented from TextQueryRetMethod.

void SimpleKLRetMethod::setDocSmoothParam ( SimpleKLParameter::DocSmoothParam & docSmthParam ) [inline]

void SimpleKLRetMethod::setQueryModelParam ( SimpleKLParameter::QueryModelParam & queryModParam ) [inline]

void SimpleKLRetMethod::updateTextQuery ( TextQueryRep & origRep, DocIDSet & relDocs ) [virtual]

Modify/update the query representation based on a set (presumably) relevant documents. Reimplemented from TextQueryRetMethod.

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Member Data Documentation

UnigramLM * SimpleKLRetMethod::collectLM [protected]

a little faster if pre-computed.

DocUnigramCounter * SimpleKLRetMethod::collectLMCounter [protected]

support the construction of collectLM.

SimpleKLParameter::DocSmoothParam SimpleKLRetMethod::docParam [protected]

double * SimpleKLRetMethod::docProbMass [protected]

needed for fast alpha computing.

double * SimpleKLRetMethod::mcNorm [protected]

needed for fast one-step Markov chain.

SimpleKLParameter::QueryModelParam SimpleKLRetMethod::qryParam [protected]

SimpleKLScoreFunc * SimpleKLRetMethod::scFunc [protected]

keep a copy to be used at any time.

int * SimpleKLRetMethod::uniqueTermCount [protected]

needed for supporting fast absolute discounting.

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

• SimpleKLRetMethod.hpp
• SimpleKLRetMethod.cpp

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