es.uam.eps.ir.ranksys.metrics.basic

Class ReciprocalRank<U,I>

java.lang.Object

es.uam.eps.ir.ranksys.metrics.AbstractRecommendationMetric<U,I>

es.uam.eps.ir.ranksys.metrics.basic.ReciprocalRank<U,I>

Type Parameters:

U - type of the users

I - type of the items

All Implemented Interfaces:

RecommendationMetric<U,I>

public class ReciprocalRank<U,I>
extends AbstractRecommendationMetric<U,I>

Reciprocal Rank (RR, also known as MRR when averaged over queries/users).

Author:

Saúl Vargas (Saul.Vargas@glasgow.ac.uk)

Constructor Summary

Constructors

Constructor and Description
ReciprocalRank(int cutoff, RelevanceModel<U,I> relModel) Constructor.

Method Summary

Modifier and Type	Method and Description
double	evaluate(Recommendation<U,I> recommendation) Returns a score for the recommendation list.

Methods inherited from class java.lang.Object

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

Constructor Detail

ReciprocalRank

public ReciprocalRank(int cutoff,
                      RelevanceModel<U,I> relModel)

Constructor.

Parameters:

cutoff - maximum length of recommended lists

relModel - relevance model

Method Detail

evaluate

public double evaluate(Recommendation<U,I> recommendation)

Returns a score for the recommendation list.

Parameters:

recommendation - recommendation list

Returns:

score of the metric to the recommendation