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SimpleKLDocModel Class Reference

Doc representation for simple KL divergence retrieval model. More...

#include <SimpleKLDocModel.hpp>

Inheritance diagram for SimpleKLDocModel:

List of all members.

Public Methods
	SimpleKLDocModel (DOCID_T docID, const UnigramLM &collectLM, int dl=1, const double *prMass=NULL, SimpleKLParameter::SmoothStrategy strat=SimpleKLParameter::INTERPOLATE)
	~SimpleKLDocModel ()
virtual double	termWeight (TERMID_T termID, const DocInfo *info) const
	term weighting function, weight(w) = p_seen(w)/p_unseen(w)
virtual double	scoreConstant () const
	doc-specific constant term in the scoring formula
virtual double	unseenCoeff () const=0
	a(d)
virtual double	seenProb (double termFreq, TERMID_T termID) const=0
	p(w|d), w seen
Protected Attributes
const UnigramLM &	refLM
const double *	docPrMass
SimpleKLParameter::SmoothStrategy	strategy

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Detailed Description

Doc representation for simple KL divergence retrieval model.

abstract interface of doc representation for smoothed document unigram model

adapt a smoothed document language model interface to a DocumentRep interface

 p(w|d) = q(w|d) if w seen
        = a(d) * Pc(w)  if w unseen
   where,  a(d) controls the probability mass allocated to all unseen words and     Pc(w) is the collection language model

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Constructor & Destructor Documentation

SimpleKLDocModel::SimpleKLDocModel (  DOCID_T    docID, const UnigramLM &    collectLM, int    dl = 1, const double *    prMass = NULL, SimpleKLParameter::SmoothStrategy    strat = SimpleKLParameter::INTERPOLATE )  [inline]

SimpleKLDocModel::~SimpleKLDocModel (    )  [inline]

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Member Function Documentation

virtual double SimpleKLDocModel::scoreConstant (    )  const [inline, virtual]

doc-specific constant term in the scoring formula Implements DocumentRep.

virtual double SimpleKLDocModel::seenProb (  double    termFreq, TERMID_T    termID )  const [pure virtual]

p(w|d), w seen Implemented in JelinekMercerDocModel, DirichletPriorDocModel, AbsoluteDiscountDocModel, and TwoStageDocModel.

virtual double SimpleKLDocModel::termWeight (  TERMID_T    termID, const DocInfo *    info )  const [inline, virtual]

term weighting function, weight(w) = p_seen(w)/p_unseen(w) Implements DocumentRep.

virtual double SimpleKLDocModel::unseenCoeff (    )  [pure virtual]

a(d) Implemented in JelinekMercerDocModel, DirichletPriorDocModel, AbsoluteDiscountDocModel, and TwoStageDocModel.

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Member Data Documentation

const double* SimpleKLDocModel::docPrMass [protected]

const UnigramLM& SimpleKLDocModel::refLM [protected]

SimpleKLParameter::SmoothStrategy SimpleKLDocModel::strategy [protected]

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

• SimpleKLDocModel.hpp

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