Le 14/07/2011 00:02, Ted Dunning a écrit :
What is the license on the original Fortran code?
There seem to be no license expressed, so we merely have to ask to the
author. The PDF paper just states at the end that it is available "free
of charge". I guess the author does not really care about licensing
issue, at least not as much as we do.
In this case, as we would be translating existing code that has been
developed as prior art before inclusion in an Apache project, we have to
ask for a Software Grant from the author. Dietmar, as you are already in
contact with the author, would you mind asking him ? If you prefer, just
introduce me to him and I'll take care of this administrative part.
On Wed, Jul 13, 2011 at 2:55 PM, Dietmar Wolz<drdietmarw...@yahoo.de>wrote:
During experiments with space flight trajectory optimizations I recently
observed, that the direct optimization algorithm BOBYQA
http://plato.asu.edu/ftp/other_software/bobyqa.zip
from Mike Powell is significantly better than the simple Powell algorithm
already in commons.math it uses significantly lower function calls and is
more reliable for high dimensional problems. You can replace CMA-ES in many
more application cases by BOBYQA than by the simple Powell optimizer.
I would like to commit a Java port of the algorithm to commons.math.
I maintained the structure of the original FORTRAN code, so the
code is fast but not very nice.
I guess it could be put in [math] first as is, with the same Fortran
struture, and modified later on if we feel it would be simpler to maintain.
Mike Powell offered his support:
"I would like BOBYQA to be used as much as possible. Therefore
I accept enthusiastically your suggestion that BOBYQA be made
available to the Apache user community."
This is great! Thanks Dietmar for making this possible.
What do you think?
By the way, I also contacted Anke Tröltsch regarding BC-DFO
www.cerfacs.fr/algor/reports/2010/TR_PA_10_70.pdf, which
also seems promising, but there is no decision yet whether
they will support a commons.math contribution.
This would be great too. Maybe I could get some contacts with Serge
Gratton. Cerfacs is in Toulouse and I know for sure many people who have
direct contact with him. I even think he was present at the same small
seminar we attended together when you and Nikolaus presented your work
on CMA-ES.
thanks again Dietmar,
Luc
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