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-package de.lmu.ifi.dbs.elki.algorithm.outlier.lof;
-
-/*
- This file is part of ELKI:
- Environment for Developing KDD-Applications Supported by Index-Structures
-
- Copyright (C) 2012
- Ludwig-Maximilians-Universität München
- Lehr- und Forschungseinheit für Datenbanksysteme
- ELKI Development Team
-
- This program is free software: you can redistribute it and/or modify
- it under the terms of the GNU Affero General Public License as published by
- the Free Software Foundation, either version 3 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 Affero General Public License for more details.
-
- You should have received a copy of the GNU Affero General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-import static org.junit.Assert.assertTrue;
-import static org.junit.Assert.fail;
-
-import java.util.ArrayList;
-import java.util.Random;
-
-import org.junit.Test;
-
-import de.lmu.ifi.dbs.elki.JUnit4Test;
-import de.lmu.ifi.dbs.elki.algorithm.outlier.lof.FlexibleLOF;
-import de.lmu.ifi.dbs.elki.algorithm.outlier.lof.LOF;
-import de.lmu.ifi.dbs.elki.algorithm.outlier.lof.OnlineLOF;
-import de.lmu.ifi.dbs.elki.data.DoubleVector;
-import de.lmu.ifi.dbs.elki.data.NumberVector;
-import de.lmu.ifi.dbs.elki.data.VectorUtil;
-import de.lmu.ifi.dbs.elki.data.type.TypeUtil;
-import de.lmu.ifi.dbs.elki.database.HashmapDatabase;
-import de.lmu.ifi.dbs.elki.database.UpdatableDatabase;
-import de.lmu.ifi.dbs.elki.database.ids.DBIDIter;
-import de.lmu.ifi.dbs.elki.database.ids.DBIDUtil;
-import de.lmu.ifi.dbs.elki.database.ids.DBIDs;
-import de.lmu.ifi.dbs.elki.database.relation.Relation;
-import de.lmu.ifi.dbs.elki.database.relation.RelationUtil;
-import de.lmu.ifi.dbs.elki.datasource.FileBasedDatabaseConnection;
-import de.lmu.ifi.dbs.elki.datasource.bundle.MultipleObjectsBundle;
-import de.lmu.ifi.dbs.elki.distance.distancefunction.CosineDistanceFunction;
-import de.lmu.ifi.dbs.elki.distance.distancefunction.DistanceFunction;
-import de.lmu.ifi.dbs.elki.distance.distancefunction.minkowski.EuclideanDistanceFunction;
-import de.lmu.ifi.dbs.elki.distance.distancevalue.DoubleDistance;
-import de.lmu.ifi.dbs.elki.result.outlier.OutlierResult;
-import de.lmu.ifi.dbs.elki.utilities.ClassGenericsUtil;
-import de.lmu.ifi.dbs.elki.utilities.exceptions.UnableToComplyException;
-import de.lmu.ifi.dbs.elki.utilities.optionhandling.parameterization.ListParameterization;
-
-/**
- * Tests the OnlineLOF algorithm. Compares the result of the static LOF
- * algorithm to the result of the OnlineLOF algorithm, where some insertions and
- * deletions (of the previously inserted objects) have been applied to the
- * database.
- *
- * @author Elke Achtert
- *
- */
-public class TestOnlineLOF implements JUnit4Test {
- // the following values depend on the data set used!
- static String dataset = "data/testdata/unittests/3clusters-and-noise-2d.csv";
-
- // parameter k for LOF and OnlineLOF
- static int k = 5;
-
- // neighborhood distance function for LOF and OnlineLOF
- @SuppressWarnings("rawtypes")
- static DistanceFunction neighborhoodDistanceFunction = EuclideanDistanceFunction.STATIC;
-
- // reachability distance function for LOF and OnlineLOF
- @SuppressWarnings("rawtypes")
- static DistanceFunction reachabilityDistanceFunction = CosineDistanceFunction.STATIC;
-
- // seed for the generator
- static int seed = 5;
-
- // size of the data set
- static int size = 50;
-
- /**
- * First, run the {@link LOF} algorithm on the database. Second, run the
- * {@link OnlineLOF} algorithm on the database, insert new objects and
- * afterwards delete them. Then, compare the two results for equality.
- *
- * @throws UnableToComplyException
- */
- @SuppressWarnings("unchecked")
- @Test
- public void testOnlineLOF() throws UnableToComplyException {
- UpdatableDatabase db = getDatabase();
-
- // 1. Run LOF
- FlexibleLOF<DoubleVector, DoubleDistance> lof = new FlexibleLOF<>(k, k, neighborhoodDistanceFunction, reachabilityDistanceFunction);
- OutlierResult result1 = lof.run(db);
-
- // 2. Run OnlineLOF (with insertions and removals) on database
- OutlierResult result2 = runOnlineLOF(db);
-
- // 3. Compare results
- Relation<Double> scores1 = result1.getScores();
- Relation<Double> scores2 = result2.getScores();
-
- for(DBIDIter id = scores1.getDBIDs().iter(); id.valid(); id.advance()) {
- Double lof1 = scores1.get(id);
- Double lof2 = scores2.get(id);
- assertTrue("lof(" + DBIDUtil.toString(id) + ") != lof(" + DBIDUtil.toString(id) + "): " + lof1 + " != " + lof2, lof1.equals(lof2));
- }
- }
-
- /**
- * Run OnlineLOF (with insertions and removals) on database.
- */
- @SuppressWarnings("unchecked")
- private static OutlierResult runOnlineLOF(UpdatableDatabase db) throws UnableToComplyException {
- Relation<DoubleVector> rep = db.getRelation(TypeUtil.DOUBLE_VECTOR_FIELD);
-
- // setup algorithm
- OnlineLOF<DoubleVector, DoubleDistance> lof = new OnlineLOF<>(k, k, neighborhoodDistanceFunction, reachabilityDistanceFunction);
-
- // run OnlineLOF on database
- OutlierResult result = lof.run(db);
-
- // insert new objects
- ArrayList<DoubleVector> insertions = new ArrayList<>();
- NumberVector.Factory<DoubleVector, ?> o = RelationUtil.getNumberVectorFactory(rep);
- int dim = RelationUtil.dimensionality(rep);
- Random random = new Random(seed);
- for(int i = 0; i < size; i++) {
- DoubleVector obj = VectorUtil.randomVector(o, dim, random);
- insertions.add(obj);
- }
- DBIDs deletions = db.insert(MultipleObjectsBundle.makeSimple(rep.getDataTypeInformation(), insertions));
-
- // delete objects
- db.delete(deletions);
-
- return result;
- }
-
- /**
- * Returns the database.
- */
- private static UpdatableDatabase getDatabase() {
- ListParameterization params = new ListParameterization();
- params.addParameter(FileBasedDatabaseConnection.Parameterizer.INPUT_ID, dataset);
-
- UpdatableDatabase db = ClassGenericsUtil.parameterizeOrAbort(HashmapDatabase.class, params);
- params.failOnErrors();
- if(params.hasUnusedParameters()) {
- fail("Unused parameters: " + params.getRemainingParameters());
- }
-
- // get database
- db.initialize();
- return db;
- }
-
-}