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

Class EIUDC<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.EIUDC<U,I>

Type Parameters:

U - type of the users

I - type of the items

All Implemented Interfaces:

SystemMetric<U,I>

Direct Known Subclasses:

GiniSimpsonIndex, IUD

public class EIUDC<U,I>
extends AbstractSalesDiversityMetric<U,I>

Expected inter user discovery complement. S. Vargas. Novelty and diversity evaluation and enhancement in Recommender Systems. PhD Thesis.

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
EIUDC(int cutoff, RankingDiscountModel disc, RelevanceModel<U,I> rel) Constructor

Method Summary

Modifier and Type	Method and Description
protected double	nov(I i) Returns the sales novelty of an item.

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

add, combine, evaluate, reset

Methods inherited from class java.lang.Object

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

Constructor Detail

EIUDC

public EIUDC(int cutoff,
             RankingDiscountModel disc,
             RelevanceModel<U,I> rel)

Constructor

Parameters:

cutoff - maximum length of the recommendation lists that is evaluated

disc - ranking discount model

rel - relevance model

Method Detail

nov

protected double nov(I i)

Description copied from class: AbstractSalesDiversityMetric

Returns the sales novelty of an item.

Specified by:

nov in class AbstractSalesDiversityMetric<U,I>

Parameters:

i - item

Returns:

the sales novelty of the item