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# invertablemodel.h

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    00001 /***************************************************************************
    00002  *   Copyright (C) 2005 by Robot Group Leipzig                             *
    00003  *    martius@informatik.uni-leipzig.de                                    *
    00004  *    fhesse@informatik.uni-leipzig.de                                     *
    00005  *    der@informatik.uni-leipzig.de                                        *
    00006  *                                                                         *
    00007  *   This program is free software; you can redistribute it and/or modify  *
    00008  *   it under the terms of the GNU General Public License as published by  *
    00009  *   the Free Software Foundation; either version 2 of the License, or     *
    00010  *   (at your option) any later version.                                   *
    00011  *                                                                         *
    00012  *   This program is distributed in the hope that it will be useful,       *
    00013  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
    00014  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
    00015  *   GNU General Public License for more details.                          *
    00016  *                                                                         *
    00017  *   You should have received a copy of the GNU General Public License     *
    00018  *   along with this program; if not, write to the                         *
    00019  *   Free Software Foundation, Inc.,                                       *
    00020  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
    00021  ***************************************************************************
    00022  *                                                                         *
    00023  *  DESCRIPTION                                                            *
    00024  *                                                                         *
    00025  *   $Log: invertablemodel.h,v $
    00026  *   Revision 1.6  2008/05/02 17:20:04  martius
    00027  *   *** empty log message ***
    00028  *
    00029  *   Revision 1.5  2007/04/02 15:24:14  der
    00030  *   inversion
    00031  *
    00032  *   Revision 1.4  2007/02/20 15:41:06  martius
    00033  *   big model stuff, elman and co
    00034  *
    00035  *   Revision 1.3  2006/08/04 15:16:13  martius
    00036  *   documentation
    00037  *
    00038  *   Revision 1.2  2006/07/20 17:14:34  martius
    00039  *   removed std namespace from matrix.h
    00040  *   storable interface
    00041  *   abstract model and invertablemodel as superclasses for networks
    00042  *
    00043  *   Revision 1.1  2006/07/18 15:45:40  martius
    00044  *   invertable models provide the linear response function (jacobian)
    00045  *
    00046  *                                                                 *
    00047  ***************************************************************************/
    00048 #ifndef __INVERTABLENN_H
    00049 #define __INVERTABLENN_H
    00050
    00051 #include "matrix.h"
    00052 #include "abstractmodel.h"
    00053
    00054 /** abstract class (interface) for invertable models.
    00055     Invertable models provide a linear response function (jacobian)
    00056 */
    00057 class InvertableModel : public AbstractModel {
    00058  public:
    00059   InvertableModel() {};
    00060   InvertableModel(const std::string& name, const std::string& revision)
    00061     : AbstractModel(name, revision) {}
    00062   virtual ~InvertableModel(){};
    00063
    00064   /** calculates the partial derivative of the of the output with repect to the input (Jacobi matrix).
    00065
    00066       \f[J_{ij} = \frac{\partial output_i}{\partial input_j}\f]
    00067
    00068       The result is a matrix of dimension (outputdim x inputdim)
    00069    */
    00070   virtual const matrix::Matrix response(const matrix::Matrix& input) const = 0;
    00071
    00072   /** calculates the input shift v to given output shift xsi via pseudo inversion.
    00073
    00074       \f[o+\xi = \pi(i+v)\f]
    00075
    00076       The result is a vector of dimension inputdim
    00077    */
    00078   virtual const matrix::Matrix inversion(const matrix::Matrix& input, const matrix::Matrix& xsi) const = 0;
    00079
    00080
    00081 };
    00082
    00083
    00084 #endif