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/*
 * 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.user;

import org.grouplens.grapht.annotation.DefaultImplementation;
import org.grouplens.lenskit.transform.threshold.AbsoluteThreshold;

import javax.inject.Qualifier;
import java.lang.annotation.*;

/**
 * Qualifier for threshold applied to user similarities.  The default is the absolute threshold,
 * which itself has a default of 0, so only positive similarities are retained.
 *
 * @since 2.1
 * @author GroupLens Research
 */
@Documented
@Qualifier
@DefaultImplementation(AbsoluteThreshold.class)
@Target({ElementType.METHOD, ElementType.PARAMETER})
@Retention(RetentionPolicy.RUNTIME)
public @interface UserSimilarityThreshold {
}