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package de.lmu.ifi.dbs.elki.math.linearalgebra.randomprojections;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2013
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.data.NumberVector;
/**
* Interface for random projection families.
*
* @author Erich Schubert
*
* @apiviz.has Projection
*/
public interface RandomProjectionFamily {
/**
* Generate a projection matrix for the given dimensionalities.
*
* @param idim Input Dimensionality
* @param odim Output Dimensionality
* @return Projection matrix
*/
Projection generateProjection(int idim, int odim);
/**
* Interface for projection instances.
*
* @author Erich Schubert
*/
static interface Projection {
/**
* Project a single vector.
*
* @param in Input vector
* @return Projected vector
*/
double[] project(NumberVector<?> in);
/**
* Get the output dimensionality.
*
* @return Output dimensionality
*/
int getOutputDimensionality();
}
}
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