Package es.uam.eps.ir.relison.links.recommendation.reranking.global.globalranking.graph

Class GraphMetricReranker<U>

java.lang.Object

es.uam.eps.ir.relison.links.recommendation.reranking.global.globalranking.GlobalRankingGreedyReranker<U,I>

es.uam.eps.ir.relison.links.recommendation.reranking.global.globalranking.GlobalRankingLambdaReranker<U,U>

es.uam.eps.ir.relison.links.recommendation.reranking.global.globalranking.graph.GraphMetricReranker<U>

Type Parameters:

U - type of the users.

All Implemented Interfaces:

GlobalReranker<U,U>

Direct Known Subclasses:

DirectGraphMetricReranker, InverseGraphMetricReranker

public abstract class GraphMetricReranker<U>
extends GlobalRankingLambdaReranker<U,U>

Global reranker strategy that reorders the candidate users according to a graph metric.

Field Summary

Fields

Modifier and Type	Field	Description
protected Graph<U>	graph	The graph.
protected GraphMetric<U>	metric	The selected metric

Fields inherited from class es.uam.eps.ir.relison.links.recommendation.reranking.global.globalranking.GlobalRankingLambdaReranker

lambda, novStats, recStats

Fields inherited from class es.uam.eps.ir.relison.links.recommendation.reranking.global.globalranking.GlobalRankingGreedyReranker

cutOff

Constructor Summary

Constructors

Constructor	Description
GraphMetricReranker(double lambda, int cutoff, java.util.function.Supplier<Normalizer<U>> norm, Graph<U> graph, GraphMetric<U> metric)	Constructor.

Method Summary

Modifier and Type	Method	Description
protected void	update(U user, org.ranksys.core.util.tuples.Tuple2od<U> bestItemValue)	Updates the value of the objective function after a selection.

Methods inherited from class es.uam.eps.ir.relison.links.recommendation.reranking.global.globalranking.GlobalRankingLambdaReranker

nov, score, selectRecommendation

Methods inherited from class es.uam.eps.ir.relison.links.recommendation.reranking.global.globalranking.GlobalRankingGreedyReranker

rerankRecommendations

Methods inherited from class java.lang.Object

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

Field Details

graph

protected final Graph<U> graph

The graph.

metric

protected final GraphMetric<U> metric

The selected metric

Constructor Details

GraphMetricReranker

public GraphMetricReranker(double lambda, int cutoff, java.util.function.Supplier<Normalizer<U>> norm, Graph<U> graph, GraphMetric<U> metric)

Constructor.

Parameters:

lambda - trade-off between the recommendation score and the novelty/diversity value.

cutoff - number of elements to take.

norm - the normalization strategy.

graph - the original graph.

metric - the metric we want to optimize.

Method Details

update

protected void update(U user, org.ranksys.core.util.tuples.Tuple2od<U> bestItemValue)

Description copied from class: GlobalRankingGreedyReranker

Updates the value of the objective function after a selection.

Specified by:

update in class GlobalRankingGreedyReranker<U,U>

Parameters:

user - the selected user.

bestItemValue - the selected item and its score.