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

Class GiniSimpsonIndex<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>

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

Type Parameters:

U - type of the users

I - type of the items

All Implemented Interfaces:

SystemMetric<U,I>

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

Gini-Simpson index sales diversity metric. It is actually a relevance and rank-unaware version of EIUDC with a proportional mapping. S. Vargas. Novelty and diversity evaluation and enhancement in Recommender Systems. PhD Thesis.

Author:

Saúl Vargas (saul.vargas@uam.es), Pablo Castells (pablo.castells@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
GiniSimpsonIndex(int cutoff) 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.EIUDC

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

GiniSimpsonIndex

public GiniSimpsonIndex(int cutoff)

Constructor.

Parameters:

cutoff - maximum length of the recommendation lists that is evaluated

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