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Re: [Bug-gnubg] Problems with latest Windows Build

From: Joseph Heled
Subject: Re: [Bug-gnubg] Problems with latest Windows Build
Date: Wed, 03 Nov 2004 20:26:26 +1300
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7) Gecko/20040616

Ned Cross wrote:
 else is having the trouble.

5) Of course the biggest problem of all is the sometimes poor results of the
pruning net in rollouts combined with the inability to use the old
evaluations at reduced speed.  2-ply rollouts performed at 50% checker and
33% cube speed have proven quite accurate and considerably faster than 2-ply
100%.  2-ply prune rollouts, while faster per number of trials, are not
proving as accurate, and have very high standard error rates, making them
possibly unusable.

Can you provide a convincing proof of that? Of course you are free to use whatever setting you like, but the reduced evaluations are worse in every test I did. For example it has about 10 times the error rate when tested over the contact benchmark. (I just did several thousand positions. will do the full test when I get more computing power).

Of course those are done using my reduced code (only 33% for moves), and GNUbg might be different implementation, I have not looked at this for a long time.

But I simply can't believe large differences. And you want to compare full 2ply with pruning and full2 ply vs. reduced, not against one another.


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