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ECJ-INTEREST-L  January 2006

ECJ-INTEREST-L January 2006

Subject:

Re: using ECJ in a Web app

From:

Eric Pascual <[log in to unmask]>

Reply-To:

[log in to unmask]

Date:

Tue, 24 Jan 2006 22:59:37 +0100

Content-Type:

text/plain

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Parts/Attachments

text/plain (49 lines)

Thanks George for your quick reply,

>      I am also an ECJ newbie, but it can't hurt to comment on your 
> email. It always makes me feel better when people respond to me, even 
> when they are wrong :).

I agree :-)

> I think that item 1/ is sensible. main() is not that difficult to 
> re-implement, especialy if you are willing to do basically cut and paste 
> from main() into the new webMain or whatever you call it. 

It was my conclusion. In fact, I have put in the doPost what is more or 
less done in Evolve.main (simplified a bit, since I don't need restart 
from checkpoint)

> I do not 
> understand very well what you mean in item 2/. By end-users input do you 
> mean parameters such as those that appear in the various params files? 

End-user parameters is the problem specific inputs which are entered in 
   form by the user, and describing the context in which he wants to 
find a solution. To be a bit more precise, they are for instance the 
dimensions of the piece to be processed by the system we are trying to 
configure with the GA. These parameters are conveyed by the Web 
container in the parameters of the Web request.

It would be possible to prgramatically store them in the ACJ parameter 
database, but I don't see a real interest in doing this. My idea was to 
store them in the EvolutionState.statics which seems to be there to make 
app specific data available to the various objects involved in the process.

> As for finding the fitest individual, is you look at 
> SimpleStatistics.finalStatistics(), for example, you will see that the 
> best_of_run array is where the best individuals are contained. It should 
> be fairly straightforward to access that member variable at the end of 
> the run, since it is public. I have not looked at other implementations 
> of Statistics, but I am pretty sure you will find it similarly easy to 
> locate the best individuals such as each Statistics subclass considers 
> them to be.

OK. That's the way I understood the philosophy of the system. Seems that 
we are at least to share the same vision, so it should not be so wrong ;-)

Thanks a lot for your help.

Best regards

Eric Pascual

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