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added generic parameter for sigmoid function

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This commit is contained in:
tlegrand 2007-10-11 14:10:27 +00:00
commit 141ccae1dd
1 changed files with 9 additions and 3 deletions
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12
eo/src/eoSigBinaryFlight.h
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@ -2,7 +2,7 @@
//----------------------------------------------------------------------------- //-----------------------------------------------------------------------------
// eoSigBinaryFlight.h // eoSigBinaryFlight.h
// (c) OPAC 2007 // (c) OPAC 2007, INRIA Futurs DOLPHIN
/* /*
This library is free software; you can redistribute it and/or This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public modify it under the terms of the GNU Lesser General Public
@ -19,6 +19,7 @@
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Contact: thomas.legrand@lifl.fr Contact: thomas.legrand@lifl.fr
clive.canape@inria.fr
*/ */
//----------------------------------------------------------------------------- //-----------------------------------------------------------------------------
@ -47,7 +48,8 @@ public:
/** /**
* Constructor. * Constructor.
*/ */
eoSigBinaryFlight (){} eoSigBinaryFlight (){slope = 1;}
eoSigBinaryFlight (unsigned _slope){slope = _slope;}
/** /**
@ -55,7 +57,7 @@ public:
*/ */
double sigmoid( double _value) double sigmoid( double _value)
{ {
return(1/(1+ exp(- _value))); return(1/(1+ exp(- _value/slope)));
} }
@ -79,6 +81,10 @@ public:
// invalidate the fitness because the positions have changed // invalidate the fitness because the positions have changed
_po.invalidate(); _po.invalidate();
} }
private :
unsigned slope;
}; };