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

From: Ian Shaw
Subject: Re: [Bug-gnubg] New positions for training database
Date: Fri, 21 Jul 2006 23:26:23 +0100
User-agent: Thunderbird (Windows/20060516)

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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