es.uam.eps.ir.ranksys.diversity.sales.metrics

Class AggregateDiversityMetric<U,I>

java.lang.Object

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

es.uam.eps.ir.ranksys.diversity.sales.metrics.AbstractSalesDiversityMetric<U,I>

es.uam.eps.ir.ranksys.diversity.sales.metrics.EIURD<U,I>

es.uam.eps.ir.ranksys.diversity.sales.metrics.AggregateDiversityMetric<U,I>

Type Parameters:

U - type of the users

I - type of the items

All Implemented Interfaces:

SystemMetric<U,I>

public class AggregateDiversityMetric<U,I>
extends EIURD<U,I>

Aggregate diversity. It is actually a rank-unaware version of EIURD multiplied by the cut-off. S. Vargas. Novelty and diversity evaluation and enhancement in Recommender Systems. PhD Thesis. G. Adomavicius and Y. Kwon. Improving aggregate recommendation diversity using rank-based techniques. TKDE vol. 24 no. 5, 2012.

Author:

Saúl Vargas (saul.vargas@uam.es)

Field Summary

Fields inherited from class es.uam.eps.ir.ranksys.diversity.sales.metrics.AbstractSalesDiversityMetric

cutoff, freeNorm, itemCount, itemWeight, numUsers

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and Description
double	evaluate() Evaluates the metric for the recommendations added so far.

Methods inherited from class es.uam.eps.ir.ranksys.diversity.sales.metrics.EIURD

nov

Methods inherited from class es.uam.eps.ir.ranksys.diversity.sales.metrics.AbstractSalesDiversityMetric

add, combine, reset

Methods inherited from class java.lang.Object

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

Constructor Detail

AggregateDiversityMetric

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

Constructor.

Parameters:

cutoff - maximum length of the recommendation lists that is evaluated

relModel - relevance model

Method Detail

evaluate

public double evaluate()

Evaluates the metric for the recommendations added so far.

Specified by:

evaluate in interface SystemMetric<U,I>

Overrides:

evaluate in class AbstractSalesDiversityMetric<U,I>

Returns:

result of the metric for the recommendations previously added