Class OriginalDirectEdgeMetricReranker<U>
java.lang.Object
es.uam.eps.ir.relison.links.recommendation.reranking.global.local.LocalReranker<U,I>
es.uam.eps.ir.relison.links.recommendation.reranking.global.local.LocalGreedyReranker<U,I>
es.uam.eps.ir.relison.links.recommendation.reranking.global.local.LocalLambdaReranker<U,U>
es.uam.eps.ir.relison.links.recommendation.reranking.global.local.GraphLocalReranker<U>
es.uam.eps.ir.relison.links.recommendation.reranking.global.local.edge.EdgeMetricReranker<U>
es.uam.eps.ir.relison.links.recommendation.reranking.global.local.edge.OriginalDirectEdgeMetricReranker<U>
- Type Parameters:
U
- type of the users.
- All Implemented Interfaces:
GlobalReranker<U,U>
public class OriginalDirectEdgeMetricReranker<U> extends EdgeMetricReranker<U>
Reranker strategy that optimizes the average value of an edge metric.
It uses the value of the metric for the original network as the novelty value.
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Field Summary
Fields Modifier and Type Field Description private java.util.Map<U,java.util.Map<U,java.lang.Double>>
values
A map containing the edge metric values for each pair in the original graph.Fields inherited from class es.uam.eps.ir.relison.links.recommendation.reranking.global.local.edge.EdgeMetricReranker
metric
Fields inherited from class es.uam.eps.ir.relison.links.recommendation.reranking.global.local.GraphLocalReranker
graph
Fields inherited from class es.uam.eps.ir.relison.links.recommendation.reranking.global.local.LocalLambdaReranker
novMap, novStats, relStats
Fields inherited from class es.uam.eps.ir.relison.links.recommendation.reranking.global.local.LocalGreedyReranker
cutOff
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Constructor Summary
Constructors Constructor Description OriginalDirectEdgeMetricReranker(double lambda, int cutoff, java.util.function.Supplier<Normalizer<U>> norm, Graph<U> graph, PairMetric<U> metric)
Constructor. -
Method Summary
Modifier and Type Method Description protected void
innerUpdate(U user, org.ranksys.core.util.tuples.Tuple2od<U> bestItemValue)
Updates the different parameters of the reranker, further than changing the edges in the graph.protected double
nov(U u, org.ranksys.core.util.tuples.Tuple2od<U> iv)
Novelty score.protected void
update(es.uam.eps.ir.ranksys.core.Recommendation<U,U> reranked)
Updates the values, given a new recommendation.protected void
update(U user, org.ranksys.core.util.tuples.Tuple2od<U> bestItemValue)
Given a user, and the next value to add, updates the reranker parameters.Methods inherited from class es.uam.eps.ir.relison.links.recommendation.reranking.global.local.LocalLambdaReranker
rerankPermutation, selectItem, value
Methods inherited from class es.uam.eps.ir.relison.links.recommendation.reranking.global.local.LocalGreedyReranker
getBasePerm, rerankRecommendation
Methods inherited from class es.uam.eps.ir.relison.links.recommendation.reranking.global.local.LocalReranker
rerankRecommendations
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Field Details
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values
A map containing the edge metric values for each pair in the original graph.
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Constructor Details
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OriginalDirectEdgeMetricReranker
public OriginalDirectEdgeMetricReranker(double lambda, int cutoff, java.util.function.Supplier<Normalizer<U>> norm, Graph<U> graph, PairMetric<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:LocalLambdaReranker
Novelty score.- Specified by:
nov
in classLocalLambdaReranker<U,U>
- Parameters:
u
- the target user.iv
- the recommended item and its recommendation score.- Returns:
- the novelty for this pair user-item.
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innerUpdate
Description copied from class:GraphLocalReranker
Updates the different parameters of the reranker, further than changing the edges in the graph.- Specified by:
innerUpdate
in classGraphLocalReranker<U>
- Parameters:
user
- the target user.bestItemValue
- the new candidate user.
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update
Description copied from class:LocalGreedyReranker
Given a user, and the next value to add, updates the reranker parameters.- Overrides:
update
in classGraphLocalReranker<U>
- Parameters:
user
- The userbestItemValue
- The next value to add at the ranking
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update
Description copied from class:LocalReranker
Updates the values, given a new recommendation.- Specified by:
update
in classLocalReranker<U,U>
- Parameters:
reranked
- the reranked recommendation.
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