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# feedforwardnn.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: feedforwardnn.h,v $
    00026  *   Revision 1.5  2006/07/20 17:14:34  martius
    00027  *   removed std namespace from matrix.h
    00028  *   storable interface
    00029  *   abstract model and invertablemodel as superclasses for networks
    00030  *
    00031  *   Revision 1.4  2006/07/18 14:49:48  martius
    00032  *   invertable networks provide the linear response function (jacobian)
    00033  *
    00034  *                                                                 *
    00035  ***************************************************************************/
    00036 #ifndef __FEEDFORWARDNN_H
    00037 #define __FEEDFORWARDNN_H
    00038
    00039 #include "abstractmodel.h"
    00040 #include <math.h>
    00041
    00042 typedef double (*ActivationFunction) (double);
    00043
    00044 /// abstract class (interface) for feed forward rate based neural networks
    00045 class FeedForwardNN : public AbstractModel {
    00046  public:
    00047   FeedForwardNN(){};
    00048   virtual ~FeedForwardNN(){};
    00049
    00050   /// damps the weights and the biases by multiplying (1-damping)
    00051   virtual void damp(double damping) =0 ;
    00052
    00053   static double linear(double x)   { return x;}
    00054   static double dlinear(double )   { return 1;}
    00055   static double tanh(double x)     { return ::tanh(x); }
    00056   static double dtanh(double x)    { double k = ::tanh(x); return 1.01-k*k; }
    00057   static double sigmoid(double x)  { return 1/(1+exp(-x)); }
    00058   static double dsigmoid(double x) { double k = sigmoid(x); return k*(1-k); }
    00059
    00060 };
    00061
    00062
    00063 #endif