package de.lmu.ifi.dbs.elki.algorithm.clustering.subspace;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;

import org.junit.Test;

import de.lmu.ifi.dbs.elki.JUnit4Test;
import de.lmu.ifi.dbs.elki.algorithm.clustering.ByLabelHierarchicalClustering;
import de.lmu.ifi.dbs.elki.data.Clustering;
import de.lmu.ifi.dbs.elki.data.DoubleVector;
import de.lmu.ifi.dbs.elki.data.model.Model;
import de.lmu.ifi.dbs.elki.data.model.SubspaceModel;
import de.lmu.ifi.dbs.elki.database.Database;
import de.lmu.ifi.dbs.elki.database.connection.FileBasedDatabaseConnection;
import de.lmu.ifi.dbs.elki.evaluation.paircounting.PairCountingFMeasure;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.ParameterException;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.parameterization.ListParameterization;

/**
 * Performs a full DiSH run, and compares the result with a clustering derived
 * from the data set labels. This test ensures that DiSH performance doesn't
 * unexpectedly drop on this data set (and also ensures that the algorithms
 * work, as a side effect).
 * 
 * @author Elke Achtert
 * 
 */
public class TestDiSHResults implements JUnit4Test {
  // the following values depend on the data set used!
  String dataset = "data/testdata/unittests/subspace-hierarchy.csv";

  // size of the data set
  int shoulds = 450;

  /**
   * Run DiSH with fixed parameters and compare the result to a golden standard.
   * 
   * @throws ParameterException
   */
  @Test
  public void testDiSHResults() throws ParameterException {
    ListParameterization params = new ListParameterization();
    params.addParameter(FileBasedDatabaseConnection.INPUT_ID, dataset);
    params.addParameter(FileBasedDatabaseConnection.IDSTART_ID, 1);
    params.addParameter(DiSH.EPSILON_ID, "0.005");
    params.addParameter(DiSH.MU_ID, 50);
    
    FileBasedDatabaseConnection<DoubleVector> dbconn = new FileBasedDatabaseConnection<DoubleVector>(params);

    // get database
    Database<DoubleVector> db = dbconn.getDatabase(null);

    // verify data set size.
    assertEquals("Database size doesn't match expected size.", shoulds, db.size());

    // setup algorithm
    DiSH<DoubleVector> dish = new DiSH<DoubleVector>(params);

    params.failOnErrors();
    if (params.hasUnusedParameters()) {
      fail("Unused parameters: "+params.getRemainingParameters());
    }
    // run DiSH on database
    Clustering<SubspaceModel<DoubleVector>> result = dish.run(db);
    
    // run by-label as reference
    ByLabelHierarchicalClustering<DoubleVector> bylabel = new ByLabelHierarchicalClustering<DoubleVector>();
    Clustering<Model> rbl = bylabel.run(db);

    double score = PairCountingFMeasure.compareClusterings(result, rbl, 1.0);
    assertTrue("DiSH score on test dataset too low: " + score, score == 1.0);
    System.out.println("DiSH score: " + score + " == " + 1.0);
  }
}
@@ -2861,14 +2861,16 @@
 ore 
-== 1.0
+%3E= 0.999
 );%0A 
@@ -2922,18 +2922,20 @@
 + %22 
-=
+%3E
 = %22 + 
-1.0
+0.999
 );%0A 

Decrease score to 0.999