org.ranksys.novdiv.reranking

Class DitheringReranker<U,I>

java.lang.Object

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

org.ranksys.novdiv.reranking.DitheringReranker<U,I>

Type Parameters:

U - type of the users

I - type of the items

All Implemented Interfaces:

Reranker<U,I>

public class DitheringReranker<U,I>
extends PermutationReranker<U,I>

Dithering re-ranker. It re-ranks the output of a recommendation by adding gaussian noise.
Check: https://buildingrecommenders.wordpress.com/2015/11/11/dithering/

Author:

Saúl Vargas (Saul.Vargas@mendeley.com)

Constructor Summary

Constructors

Constructor and Description
DitheringReranker(double variance) Constructor.

Method Summary

Modifier and Type	Method and Description
int[]	rerankPermutation(Recommendation<U,I> recommendation, int maxLength) Returns the permutation that is applied to the input recommendation to generate the re-ranked recommendation.

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

DitheringReranker

public DitheringReranker(double variance)

Constructor.

Parameters:

variance - variance of the gaussian noise to be added to the original recommendation scores.

Method Detail

rerankPermutation

public int[] rerankPermutation(Recommendation<U,I> recommendation,
                               int maxLength)

Description copied from class: PermutationReranker

Returns the permutation that is applied to the input recommendation to generate the re-ranked recommendation.

Specified by:

rerankPermutation in class PermutationReranker<U,I>

Parameters:

recommendation - input recommendation

maxLength - maximum length of the permutation

Returns:

permutation that encodes the re-ranking