org.lenskit.knn.item.ItemItemResult Maven / Gradle / Ivy
/*
* LensKit, an open source recommender systems toolkit.
* Copyright 2010-2014 LensKit Contributors. See CONTRIBUTORS.md.
* Work on LensKit has been funded by the National Science Foundation under
* grants IIS 05-34939, 08-08692, 08-12148, and 10-17697.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 51
* Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package org.lenskit.knn.item;
import org.lenskit.results.AbstractResult;
/**
* The result type for item-item collaborative filtering.
*/
public class ItemItemResult extends AbstractResult {
private final int neighborhoodSize;
private final double neighborWeight;
/**
* Construct a new item-item CF result.
* @param item The item ID.
* @param score The score.
* @param nnbrs The neighborhood size.
*/
public ItemItemResult(long item, double score, int nnbrs, double weight) {
super(item, score);
neighborhoodSize = nnbrs;
neighborWeight = weight;
}
/**
* Get the number of neighbors used to score this item.
* @return The number of neighbors used to score this item.
*/
public int getNeighborhoodSize() {
return neighborhoodSize;
}
/**
* Get the total weight of the neighborhood.
* @return The total weight of the neighborhood.
*/
public double getNeighborWeight() {
return neighborWeight;
}
@Override
public String toString() {
return "ItemItemResult{" +
"id=" + getId() +
", score=" + getScore() +
", nnbrs=" + neighborhoodSize +
", weight=" + neighborWeight +
'}';
}
@Override
public int hashCode() {
return startHashCode().append(neighborhoodSize).toHashCode();
}
@Override
public boolean equals(Object obj) {
if (obj instanceof ItemItemResult) {
ItemItemResult or = (ItemItemResult) obj;
return startEquality(or).append(neighborhoodSize, or.neighborhoodSize).isEquals();
} else {
return false;
}
}
}
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