[Paradiseo-help] Minimization problems in Paradiseo-MO

Sebastien Verel verel at i3s.unice.fr
Mar 20 Nov 10:08:30 CET 2012

Dear Manuel,

MO library is based on the principles of EO library.

To minimize, you have to replace the fitness type, for example
"double", by "eoMinimizingFitness". Then, all the comparison operators
are defined according to minimization (operator<, etc.). Please, find
some details in the EO tutorial Lesson 2, exercice 1 :
and in the documentation in the class eoScalarFitness

Another example. Imagine that your problem is a bit string problem
with fitness type "double" and the neighborhood is the 1 bit-flip.
Then, following the lesson 1 of the MO tutorial, we have defined the
following typedef:
typedef eoBit< double > Indi;
typedef moBitNeighbor< double > Neighbor ;

If you want to minimize, replace "double" by "eoMinimizingFitness":
typedef eoBit< eoMinimizingFitness > Indi;
typedef moBitNeighbor< eoMinimizingFitness > Neighbor ;

If you want to go further with comparison in MO, we have explicitly
introduced some classes to handle comparisons. See the documentation
on moComparator :

 Have fun !

On Mon, Nov 19, 2012 at 10:25 PM, Manuel Chica Serrano
<mchi317 at aucklanduni.ac.nz> wrote:
> Dear all,
> I am starting to use the MO library of Paradiseo and I am getting into it
> very fast. Congrats for your work!
> However, I am not able to find any way to set if my fitness function must be
> minimized or maximized (apart from making f(x) = -f(x)).
> I have previously used the MOEO library and it was as easy as setting some
> methods of the moeoObjectiveVectorTraits object.
> Could you please let me know if there is a way in ParadiseoMO to set fitness
> to be minimized?
> Regards
> MC
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