/*
* Copyright 2011 Research Studios Austria Forschungsgesellschaft mBH
*
* This file is part of easyrec.
*
* easyrec is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* easyrec 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 easyrec. If not, see <http://www.gnu.org/licenses/>.
*/
package org.easyrec.plugin.mahout;
import org.apache.mahout.cf.taste.common.TasteException;
import org.apache.mahout.cf.taste.impl.neighborhood.ThresholdUserNeighborhood;
import org.apache.mahout.cf.taste.impl.recommender.GenericBooleanPrefUserBasedRecommender;
import org.apache.mahout.cf.taste.impl.similarity.TanimotoCoefficientSimilarity;
import org.apache.mahout.cf.taste.neighborhood.UserNeighborhood;
import org.apache.mahout.cf.taste.recommender.Recommender;
import org.apache.mahout.cf.taste.similarity.UserSimilarity;
import org.easyrec.mahout.model.EasyrecDataModel;
import org.easyrec.mahout.store.MahoutDataModelMappingDAO;
import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.unitils.UnitilsJUnit4TestClassRunner;
import org.unitils.dbunit.annotation.DataSet;
import org.unitils.spring.annotation.SpringApplicationContext;
import org.unitils.spring.annotation.SpringBeanByName;
@RunWith(UnitilsJUnit4TestClassRunner.class)
@SpringApplicationContext({
"spring/easyrecDataSource.xml",
"spring/easyrec-mahoutBooleanGenerator-test.xml"})
@DataSet("/dbunit/mahoutBooleanGeneratorTest.xml")
public class MahoutBooleanGeneratorTest {
@SpringBeanByName
protected MahoutDataModelMappingDAO mahoutDataModelMappingDAO;
private static int TENANT_ID = 1;
private static int BUY_ACTION_TYPE_ID = 3;
@Test
public void mahoutSlopeoneGeneratorTest_testBoolRecommender() throws TasteException {
EasyrecDataModel easyrecDataModel = new EasyrecDataModel(TENANT_ID, BUY_ACTION_TYPE_ID, false, mahoutDataModelMappingDAO);
/*TanimotoCoefficientSimilarity is intended for "binary" data sets where a user either expresses a generic "yes" preference for an item or has no preference.*/
UserSimilarity userSimilarity = new TanimotoCoefficientSimilarity(easyrecDataModel);
/*ThresholdUserNeighborhood is preferred in situations where we go in for a similarity measure between neighbors and not any number*/
UserNeighborhood neighborhood = new ThresholdUserNeighborhood(0.1d, userSimilarity, easyrecDataModel);
/*GenericBooleanPrefUserBasedRecommender is appropriate for use when no notion of preference value exists in the data. */
Recommender recommender = new GenericBooleanPrefUserBasedRecommender(easyrecDataModel, neighborhood, userSimilarity);
Assert.assertEquals(30, recommender.recommend(3, 1).get(0).getItemID());
Assert.assertEquals(1,(int) recommender.recommend(3, 1).get(0).getValue());
}
}