es.uam.eps.ir.ranksys.metrics.basic.Recommendability Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of RankSys-metrics Show documentation
Show all versions of RankSys-metrics Show documentation
RankSys module, providing interfaces and common components for defining metrics.
The newest version!
/*
* Copyright (C) 2015 Information Retrieval Group at Universidad Autónoma
* de Madrid, http://ir.ii.uam.es
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
package es.uam.eps.ir.ranksys.metrics.basic;
import es.uam.eps.ir.ranksys.metrics.AbstractRecommendationMetric;
import es.uam.eps.ir.ranksys.core.Recommendation;
/**
* Recommendability: binary metric that determines whether the user receives
* a non-empty recommendation or not.
*
* @author Saúl Vargas ([email protected])
*
* @param type of the users
* @param type of the items
*/
public class Recommendability extends AbstractRecommendationMetric {
/**
* Returns a score for the recommendation list.
*
* @param recommendation recommendation list
* @return score of the metric to the recommendation
*/
@Override
public double evaluate(Recommendation recommendation) {
return recommendation.getItems().isEmpty() ? 0.0 : 1.0;
}
}