Class OriginalDirectUserMetricReranker<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.user.UserMetricReranker<U>
es.uam.eps.ir.relison.links.recommendation.reranking.global.globalranking.user.OriginalDirectUserMetricReranker<U>
- Type Parameters:
U
- type of the users
- All Implemented Interfaces:
GlobalReranker<U,U>
public class OriginalDirectUserMetricReranker<U> extends UserMetricReranker<U>
Global reranker that optimizes the average value of vertex metric.
The value of the metric in the original graph is taken as the novelty score.
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Field Summary
Fields inherited from class es.uam.eps.ir.relison.links.recommendation.reranking.global.globalranking.user.UserMetricReranker
graph, 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
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Constructor Summary
Constructors Constructor Description OriginalDirectUserMetricReranker(double lambda, int cutoff, java.util.function.Supplier<Normalizer<U>> norm, Graph<U> graph, VertexMetric<U> metric)
Constructor. -
Method Summary
Modifier and Type Method Description protected double
nov(U user, org.ranksys.core.util.tuples.Tuple2od<U> iv)
Finds the novelty score for a user-item pair.protected void
update(U user, org.ranksys.core.util.tuples.Tuple2od<U> selectedItem)
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
score, selectRecommendation
Methods inherited from class es.uam.eps.ir.relison.links.recommendation.reranking.global.globalranking.GlobalRankingGreedyReranker
rerankRecommendations
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Constructor Details
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OriginalDirectUserMetricReranker
public OriginalDirectUserMetricReranker(double lambda, int cutoff, java.util.function.Supplier<Normalizer<U>> norm, Graph<U> graph, VertexMetric<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.
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Method Details
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nov
Description copied from class:GlobalRankingLambdaReranker
Finds the novelty score for a user-item pair.- Specified by:
nov
in classGlobalRankingLambdaReranker<U,U>
- Parameters:
user
- the target user.iv
- the candidate item (with its score).- Returns:
- the novelty value for the item.
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update
Description copied from class:GlobalRankingGreedyReranker
Updates the value of the objective function after a selection.- Specified by:
update
in classGlobalRankingGreedyReranker<U,U>
- Parameters:
user
- the selected user.selectedItem
- the selected item and its score.
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