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RE: [Bug-gnubg] New positions for training database

From: Albert Silver
Subject: RE: [Bug-gnubg] New positions for training database
Date: Fri, 21 Jul 2006 19:57:03 -0300

Well, just to be clear. I am available to provide feedback and suggestions,
and of course will assist in computer time for any training or rollouts


> -----Original Message-----
> From: address@hidden [mailto:bug-gnubg-
> address@hidden On Behalf Of Ian Shaw
> Sent: Friday, July 21, 2006 7:26 PM
> To: Frank Berger
> Cc: address@hidden; address@hidden; address@hidden
> Subject: Re: [Bug-gnubg] New positions for training database
> Frank Berger wrote:
> >> Interesting. That's a surprise to me. I would have thought there would
> >> be benefits. I haven't played much nackgammon myself, so I don't know
> >> how games evolve. Maybe with both sides having four men back,
> reasonably
> >> timed one-sided backgames rarely evolve.
> > For GNU it may work better, because of the different training methods
> > (BGBlitz uses straight TD(lambda)-Training). I would guess it's worth
> > a try.
> In contrast, Gnubg used TD training to get to intermediate level, then
> supervised training to get to it's current expert level after TD
> training settled at a certain level. I had assumed that TD can only
> reach a certain limit. It's interesting that bgblitz has achieved the
> same standard as gnubg through TD alone.
> Has anyone tried going back to TD training after a period of supervised
> training? Perhaps now that gnubg has got over its sticking point it can
> learn more from TD. Perhaps there are subtleties it can now discover now
> that it is already an expert.
> >> Another approach might start from prototype holding games and backgames
> >> such as found in Kit Woolsey's Encyclopaedia. The idea being that these
> >> are common positions, so it is useful to have plenty of data for
> >> accurate training.
> > If you enter the positions, could you please send me a copy?
> Certainly, but it won't be anytime soon, if I do it at all.
> -- Ian
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