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Re: [Bug-gnubg] Is it time for Gnubg 0.15? Re-rolling the position datab

From: Jonathan Kinsey
Subject: Re: [Bug-gnubg] Is it time for Gnubg 0.15? Re-rolling the position database.
Date: Tue, 18 Jul 2006 09:14:14 +0100
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv: Gecko/20060516 Thunderbird/ Mnenhy/

Ian Shaw wrote:
> Astonishingly, it's been about three years since version 0.14 of gnubg was 
> released. It has proved to be superior to JellyFish and at least the equal of 
> Snowie 4. Since then, BgBlitz has arrived as a serious opponent, and rumours 
> of Z-bot's approach persist. If it ever arrives, I'm sure it will be a strong 
> player.
> I think we've rested on our laurels long enough, and it's about time we 
> started trying to improve the playing strength of our favourite bot.
> I can think of several ways where might seek to make improvements:
> A) Speed up the evaluation function so gnubg can search faster, and maybe 
> deeper.
> B) Improve the evaluation function by changing the neural net inputs or 
> hidden nodes.
> C) Retrain the existing net using a new set of training positions.
> D) Retrain the existing net using newer rollouts of the current set of 
> training positions.

Is having more neural nets a good idea?  The race net does seem nearly
perfect, the crashed net is quite specialised, this seems to leave a lot
of positions for the contact net (the vast majority I guess).  If we
split the contact positions up into several/lots of different
categorises (e.g. back games, holding games, prime positions) would this
produce a stronger bot?

I've deliberately side-stepped how you would exactly define these types
of positions and also the worked involved...  Just wondered if it was a
direction worth considering?


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