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package de.lmu.ifi.dbs.elki.math.linearalgebra.pca;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2011
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 de.lmu.ifi.dbs.elki.math.linearalgebra.SortedEigenPairs;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.Parameterizable;
/**
* The eigenpair filter is used to filter eigenpairs (i.e. eigenvectors
* and their corresponding eigenvalues) which are a result of a
* Variance Analysis Algorithm, e.g. Principal Component Analysis.
* The eigenpairs are filtered into two types: strong and weak eigenpairs,
* where strong eigenpairs having high variances
* and weak eigenpairs having small variances.
*
* @author Elke Achtert
*
* @apiviz.uses SortedEigenPairs oneway - - reads
* @apiviz.uses FilteredEigenPairs oneway - - «create»
*/
public interface EigenPairFilter extends Parameterizable {
/**
* Filters the specified eigenpairs into strong and weak eigenpairs,
* where strong eigenpairs having high variances
* and weak eigenpairs having small variances.
*
* @param eigenPairs the eigenPairs (i.e. the eigenvectors and
* @return the filtered eigenpairs
*/
public FilteredEigenPairs filter(SortedEigenPairs eigenPairs);
}
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