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July 2014

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Subject:
Re: where ECJ calls Evaluate() method
From:
Eric 'Siggy' Scott <[log in to unmask]>
Reply To:
ECJ Evolutionary Computation Toolkit <[log in to unmask]>
Date:
Tue, 29 Jul 2014 11:23:08 -0400
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The post-evaluation stage is only for running statistics.

Look in the evolve() method of your EvolutionState -- that has the
high-level loop.  You'll probably want to customize your Evaluator to add a
post-processing step, leaving the EvolutionState as is.

Siggy


On Tue, Jul 29, 2014 at 11:02 AM, Márcio Basgalupp <[log in to unmask]>
wrote:

> Thank you Ye.
>
> That's true.
>
> But my question is: where (in the code) is this post-evaluation stage?
>
> Best,
> Márcio
> --------
> Prof. Dr. Márcio Porto Basgalupp
> Instituto de Ciência e Tecnologia (ICT)
> Universidade Federal de São Paulo (UNIFESP)
> Tel: +55 12 3309-9582
>
>
> On Tue, Jul 29, 2014 at 11:40 AM, Xiaomeng Ye <[log in to unmask]>
> wrote:
> > It has been a while since I last used ECJ. I could be totally wrong.
> >
> > I remember there is a post-evaluation stage for each generation in the
> > evolution. If I am going to divide all fitness values by the biggest
> one. I
> > will do it in this post-evaluation stage.
> >
> > This post-evaluation stage is probably between the evaluation stage
> (where
> > the fitness are calculated) and the breeding stage (where
> crossover/mutation
> > happens).
> >
> >
> > On Tue, Jul 29, 2014 at 10:18 AM, Márcio Basgalupp <[log in to unmask]>
> > wrote:
> >>
> >> Dear all,
> >>
> >> I'm using ECJ for implementing a GP based-program. After evaluating
> >> (compute fitness) all individuals, I would like to "update" these
> >> fitness values (for example, divide all fitness values by the biggest
> >> one). However, I couldn't find where (which class) I have to do that.
> >> It should be where ECJ calls the method evaluate() for each
> >> individual, then I could update before proceeding to the next steps
> >> (select, genetic operators, ...).
> >>
> >> I would appreciate if someone help me.
> >>
> >> Best,
> >> Márcio
> >>
> >> --------
> >> Prof. Dr. Márcio Porto Basgalupp
> >> Instituto de Ciência e Tecnologia (ICT)
> >> Universidade Federal de São Paulo (UNIFESP)
> >> Tel: +55 12 3309-9582
> >
> >
>



-- 

Ph.D student in Computer Science
George Mason University
http://mason.gmu.edu/~escott8/

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