Examples with OutlierROCCurve de.lmu.ifi.dbs.elki.evaluation.outlier.OutlierROCCurve used on opensource projects

Example 1 with OutlierROCCurve

use of de.lmu.ifi.dbs.elki.evaluation.outlier.OutlierROCCurve in project elki by elki-project.

the class AbstractOutlierAlgorithmTest method testAUC.

/**
 * Test the AUC value for an outlier result.
 *
 * @param db Database
 * @param positive Positive class name
 * @param result Outlier result to process
 * @param expected Expected AUC value
 */
protected void testAUC(Database db, String positive, OutlierResult result, double expected) {
    OutlierROCCurve rocCurve = // 
    new ELKIBuilder<>(OutlierROCCurve.class).with(OutlierROCCurve.Parameterizer.POSITIVE_CLASS_NAME_ID, positive).build();
    // Ensure the result has been added to the hierarchy:
    ResultHierarchy hier = db.getHierarchy();
    if (hier.numParents(result) < 1) {
        hier.add(db, result);
    }
    // Compute ROC and AUC:
    rocCurve.processNewResult(hier, result);
    // Find the ROC results
    Collection<OutlierROCCurve.ROCResult> rocs = ResultUtil.filterResults(hier, result, OutlierROCCurve.ROCResult.class);
    assertTrue("No ROC result found.", !rocs.isEmpty());
    double auc = rocs.iterator().next().getAUC();
    assertFalse("More than one ROC result found.", rocs.size() > 1);
    assertEquals("ROC value does not match.", expected, auc, 0.0001);
}