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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 (int docID,UnigramLM &collectLM)
	~SimpleKLDocModel ()
virtual double	termWeight (int termID,DocInfo *info)
	term weighting function, weight(w) = p_seen(w)/p_unseen(w).
virtual double	scoreConstant ()
	doc-specific constant term in the scoring formula.
virtual double	unseenCoeff ()=0
	a(d).
virtual double	seenProb (double termFreq,int termID)=0
	p(w|d), w seen.
Protected Attributes
UnigramLM&	refLM

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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 ( int docID, UnigramLM & collectLM ) [inline]

SimpleKLDocModel::~SimpleKLDocModel ( ) [inline]

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Member Function Documentation

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

doc-specific constant term in the scoring formula. Reimplemented from DocumentRep.

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

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

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

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

double SimpleKLDocModel::unseenCoeff ( ) [pure virtual]

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

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Member Data Documentation

UnigramLM & SimpleKLDocModel::refLM [protected]

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

• SimpleKLDocModel.hpp

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