/*
* 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.grouplens.lenskit.data.event;
import static org.junit.Assert.*;
import static org.hamcrest.Matchers.*;
import org.grouplens.lenskit.data.pref.Preference;
import org.grouplens.lenskit.data.pref.Preferences;
import org.grouplens.lenskit.vectors.MutableSparseVector;
import org.junit.Test;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
/**
* @author <a href="http://www.grouplens.org">GroupLens Research</a>
*/
public class RatingsTest {
@Test
public void testGetValueOfSR() {
SimpleRating rating = new SimpleRating(1, 2, 3.0, 3);
assertThat(rating.hasValue(), equalTo(true));
assertThat(rating.getValue(), equalTo(3.0));
}
@Test
public void testGetValueOfSNR() {
SimpleNullRating rating = new SimpleNullRating(1, 3, 5);
assertThat(rating.hasValue(), equalTo(false));
}
@Test
public void testGetValueOfMR() {
MutableRating rating = new MutableRating();
assertThat(rating.hasValue(), equalTo(true));
rating.setRating(2.0);
assertThat(rating.getValue(), equalTo(2.0));
}
@Test
public void testSimpleEquality() {
Rating r1 = Ratings.make(1, 2, 3.0, 0);
Rating r1a = Ratings.make(1, 2, 3.0, 0);
Rating r2 = Ratings.make(1, 3, 2.5, 1);
Rating rn = new SimpleNullRating(1, 2, 0);
assertThat(r1, equalTo(r1));
assertThat(r1a, equalTo(r1));
assertThat(r2, not(equalTo(r1)));
assertThat(r1, not(equalTo(r2)));
assertThat(rn, not(equalTo(r1)));
assertThat(r1, not(equalTo(rn)));
Preference p = Preferences.make(1, 2, 3.0);
assertThat((Preference) r1, equalTo(p));
assertThat(p, equalTo((Preference) r1));
}
@Test
public void testEmptyURV() {
List<Rating> ratings = Collections.emptyList();
MutableSparseVector urv = Ratings.userRatingVector(ratings);
assertThat(urv.isEmpty(), equalTo(true));
assertThat(urv.size(), equalTo(0));
}
@Test
public void testURVRatingsInOrder() {
List<Rating> ratings = new ArrayList<Rating>();
ratings.add(new SimpleRating(1, 2, 3.0, 3));
ratings.add(new SimpleRating(1, 3, 4.5, 7));
ratings.add(new SimpleRating(1, 5, 2.3, 10));
MutableSparseVector urv = Ratings.userRatingVector(ratings);
assertThat(urv.isEmpty(), equalTo(false));
assertThat(urv.size(), equalTo(3));
assertThat(urv.get(2), closeTo(3.0, 1.0e-6));
assertThat(urv.get(3), closeTo(4.5, 1.0e-6));
assertThat(urv.get(5), closeTo(2.3, 1.0e-6));
assertThat(urv.containsKey(1), equalTo(false));
}
@Test
public void testURVRatingsOutOfOrder() {
List<Rating> ratings = new ArrayList<Rating>();
ratings.add(new SimpleRating(1, 2, 3.0, 3));
ratings.add(new SimpleRating(1, 5, 2.3, 7));
ratings.add(new SimpleRating(1, 3, 4.5, 10));
MutableSparseVector urv = Ratings.userRatingVector(ratings);
assertThat(urv.isEmpty(), equalTo(false));
assertThat(urv.size(), equalTo(3));
assertThat(urv.get(2), closeTo(3.0, 1.0e-6));
assertThat(urv.get(3), closeTo(4.5, 1.0e-6));
assertThat(urv.get(5), closeTo(2.3, 1.0e-6));
assertThat(urv.containsKey(1), equalTo(false));
}
@Test
public void testURVRatingsDup() {
List<Rating> ratings = new ArrayList<Rating>();
ratings.add(new SimpleRating(1, 2, 3.0, 3));
ratings.add(new SimpleRating(1, 5, 2.3, 4));
ratings.add(new SimpleRating(1, 3, 4.5, 5));
ratings.add(new SimpleRating(1, 5, 3.7, 6));
MutableSparseVector urv = Ratings.userRatingVector(ratings);
assertThat(urv.isEmpty(), equalTo(false));
assertThat(urv.size(), equalTo(3));
assertThat(urv.get(2), closeTo(3.0, 1.0e-6));
assertThat(urv.get(3), closeTo(4.5, 1.0e-6));
assertThat(urv.get(5), closeTo(3.7, 1.0e-6));
assertThat(urv.containsKey(1), equalTo(false));
}
@Test
public void testURVRatingsRmv() {
List<Rating> ratings = new ArrayList<Rating>();
ratings.add(new SimpleRating(1, 2, 3.0, 3));
ratings.add(new SimpleRating(1, 5, 2.3, 5));
ratings.add(new SimpleNullRating(1, 2, 7));
ratings.add(new SimpleRating(1, 3, 4.5, 8));
MutableSparseVector urv = Ratings.userRatingVector(ratings);
assertThat(urv.isEmpty(), equalTo(false));
assertThat(urv.size(), equalTo(2));
assertThat(urv.get(3), closeTo(4.5, 1.0e-6));
assertThat(urv.get(5), closeTo(2.3, 1.0e-6));
assertThat(urv.containsKey(1), equalTo(false));
assertThat(urv.containsKey(2), equalTo(false));
}
@Test
public void testURVRatingsDupOutOfOrder() {
List<Rating> ratings = new ArrayList<Rating>();
ratings.add(new SimpleRating(1, 2, 3.0, 3));
ratings.add(new SimpleRating(1, 5, 2.3, 7));
ratings.add(new SimpleRating(1, 3, 4.5, 5));
ratings.add(new SimpleRating(1, 5, 3.7, 6));
MutableSparseVector urv = Ratings.userRatingVector(ratings);
assertThat(urv.isEmpty(), equalTo(false));
assertThat(urv.size(), equalTo(3));
assertThat(urv.get(2), closeTo(3.0, 1.0e-6));
assertThat(urv.get(3), closeTo(4.5, 1.0e-6));
assertThat(urv.get(5), closeTo(2.3, 1.0e-6));
assertThat(urv.containsKey(1), equalTo(false));
}
@Test
public void testEmptyIRV() {
List<Rating> ratings = Collections.emptyList();
MutableSparseVector urv = Ratings.itemRatingVector(ratings);
assertThat(urv.isEmpty(), equalTo(true));
assertThat(urv.size(), equalTo(0));
}
@Test
public void testIRVRatings() {
List<Rating> ratings = new ArrayList<Rating>();
ratings.add(new SimpleRating(1, 2, 3.0, 1));
ratings.add(new SimpleRating(3, 2, 4.5, 2));
ratings.add(new SimpleRating(2, 2, 2.3, 3));
ratings.add(new SimpleRating(3, 2, 4.5, 10));
MutableSparseVector urv = Ratings.itemRatingVector(ratings);
assertThat(urv.isEmpty(), equalTo(false));
assertThat(urv.size(), equalTo(3));
assertThat(urv.get(1), closeTo(3.0, 1.0e-6));
assertThat(urv.get(3), closeTo(4.5, 1.0e-6));
assertThat(urv.get(2), closeTo(2.3, 1.0e-6));
assertThat(urv.containsKey(5), equalTo(false));
}
}