Hi!
On Thu, Dec 30, 2010 at 07:08:27PM +0200, Francois van Niekerk wrote:
> Some details about Oakfoam:
> - UCT algo (surprise, surprise ;))
> - RAVE
> - Mogo 3x3 patterns
> - Open Source under the BSD license
> - Almost everything is adjustable at runtime using parameters
> - Achieved a 1700 ELO rating on CGOS 9x9 recently
> - Repo at http://bitbucket.org/francoisvn/oakfoam/
Awesome! Best of luck to you. I think some people have been looking
for a BSD-licenced engine with reasonable playing strength, so this will
make them happy too. :-)
> I have been working almost exclusively on 9x9. I would also like to
> mention that most of my parameters have not been tuned, so when I get
> around to that I should get some more "free" strength. However, my
> program mostly seems to be comparable to others when using UCT+RAVE so
> I'm satisfied for now. For reference I need about 100k playouts with
> RAVE to get 50% winrate against GnuGo 3.8 L10. Does this seem in
> order?
I guess so. If you want to also to move up to 19x19, try adding
priors to your moves based on the Common Fate Graph distance to the last
move; I think your program should get to at least 5k KGS at that point
if you have everything well debugged.
> So my questions are: Does anyone know where I might have gone wrong?
> Is there a way for me to better verify that my feature gammas are ok?
I have also tried to adopt the Elo way and failed, with similar
results to yours, and I know others that did. And I also know some
people that managed to get it working beautifully. So there is a trick
somewhere along the way and it is unfortunately not known widely.
Please also note that the original paper describes a program that does
not contain RAVE; many plain UCT improvements are rendered ineffective
and overshadown wrt. RAVE (which is such a - disappointingly, for
further research - superb hauristic). Some people managed to get it work
with RAVE too. Another possible suspect might be progressive unpruning.
--
Petr "Pasky" Baudis
Computer science education cannot make an expert programmer any more
than studying brushes and pigment can make an expert painter. --esr
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