es.uam.eps.ir.ranksys.diversity.binom.reranking

Class BinomialCoverageReranker<U,I,F>

java.lang.Object

es.uam.eps.ir.ranksys.novdiv.reranking.PermutationReranker<U,I>

es.uam.eps.ir.ranksys.novdiv.reranking.GreedyReranker<U,I>

es.uam.eps.ir.ranksys.novdiv.reranking.LambdaReranker<U,I>

es.uam.eps.ir.ranksys.diversity.binom.reranking.BinomialCoverageReranker<U,I,F>

Type Parameters:

U - type of the users

I - type of the items

F - type of the features

All Implemented Interfaces:

Reranker<U,I>

public class BinomialCoverageReranker<U,I,F>
extends LambdaReranker<U,I>

Binomial coverage reranker. S. Vargas, L. Baltrunas, A. Karatzoglou, P. Castells. Coverage, redundancy and size-awareness in genre diversity for Recommender Systems. RecSys 2014.

Author:

Saúl Vargas (saul.vargas@uam.es)

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
class	BinomialCoverageReranker.BinomialCoverageUserReranker User re-ranker for BinomialCoverageReranker.

Nested classes/interfaces inherited from class es.uam.eps.ir.ranksys.novdiv.reranking.LambdaReranker

LambdaReranker.LambdaUserReranker

Nested classes/interfaces inherited from class es.uam.eps.ir.ranksys.novdiv.reranking.GreedyReranker

GreedyReranker.GreedyUserReranker<U,I>

Field Summary

Fields inherited from class es.uam.eps.ir.ranksys.novdiv.reranking.LambdaReranker

lambda

Fields inherited from class es.uam.eps.ir.ranksys.novdiv.reranking.GreedyReranker

cutoff

Constructor Summary

Constructors

Constructor and Description
BinomialCoverageReranker(FeatureData<I,F,?> featureData, BinomialModel<U,I,F> binomialModel, double lambda, int cutoff) Constructor.

Method Summary

Modifier and Type	Method and Description
protected BinomialCoverageReranker.BinomialCoverageUserReranker	getUserReranker(Recommendation<U,I> recommendation, int maxLength) Returns an instance of GreedyReranker.GreedyUserReranker that does the greedy selection.

Methods inherited from class es.uam.eps.ir.ranksys.novdiv.reranking.LambdaReranker

rerankPermutation

Methods inherited from class es.uam.eps.ir.ranksys.novdiv.reranking.PermutationReranker

getBasePerm, permuteRecommendation, rerankRecommendation

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

BinomialCoverageReranker

public BinomialCoverageReranker(FeatureData<I,F,?> featureData,
                                BinomialModel<U,I,F> binomialModel,
                                double lambda,
                                int cutoff)

Constructor.

Parameters:

featureData - feature data

binomialModel - binomial model

lambda - trade-off between relevance and novelty

cutoff - number of items to be greedily selected

Method Detail

getUserReranker

protected BinomialCoverageReranker.BinomialCoverageUserReranker getUserReranker(Recommendation<U,I> recommendation,
                                                                                int maxLength)

Description copied from class: GreedyReranker

Returns an instance of GreedyReranker.GreedyUserReranker that does the greedy selection.

Specified by:

getUserReranker in class LambdaReranker<U,I>

Parameters:

recommendation - input recommendation to be re-ranked

maxLength - maximum length of the resulting re-ranked recommendation

Returns:

the GreedyReranker.GreedyUserReranker that does the re-ranking