es.uam.eps.ir.ranksys.metrics.rank.ReciprocalDiscountModel Maven / Gradle / Ivy
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RankSys module, providing interfaces and common components for defining metrics.
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/*
* 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.rank;
/**
* Reciprocal discount: disc(k) = 1 / (k + 1).
*
* @author Saúl Vargas ([email protected])
* @author Pablo Castells ([email protected])
*/
public class ReciprocalDiscountModel implements RankingDiscountModel {
/**
* Discount to be applied at a given position.
*
* @param k position in the recommendation list starting from 0
* @return discount to be applied for the given rank position
*/
@Override
public double disc(int k) {
return 1 / (k + 1.0);
}
}