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Re: [Bug-gnubg] misevaluation on 0-ply
From: |
Joseph Heled |
Subject: |
Re: [Bug-gnubg] misevaluation on 0-ply |
Date: |
Tue, 11 Nov 2008 07:46:41 +1300 |
The race evaluation is heaps better than the contact one, but not
perfect. If you are worried about a ply 0 error here you will be
horrified by the errors in contact situations, and perhaps stop
believing in rollouts :). Yet as far as I know GNUbg 0ply (Snowie 1
ply) is the best among the bots, and usually a rollout will not suffer
that greatly as it averages over many possible dice sequences.
-Joseph
On Tue, Nov 11, 2008 at 1:37 AM, Sven-Olav Norén
<address@hidden> wrote:
> Hi,
>
> Hope you can read the position below. As you can see GNU makes a big misstep
> on 0-ply evaluation. GNU:s choice loses about 80% gammons instead of a
> normal gammon saving move that would lose about 40% gammon. GNU corrects
> itself on 1-ply and higher levels, so it might have no or small practical
> importance. However it bothers me as I often use 0-ply when doing
> rollouts. So I'm curious if anyone with inight in the neural nets might have
> some explanation or comment.
>
>
> Kind regards
> Sven-Olav Norén, Stockholm Sweden
>
> 2wIAAKuzqgIAAA:MIGpAAAAAAAA
>
> The score (after 0 games) is: gnubg 0, snoren 0 (match to 5 points)
> Match Information:
> Date: 2008-11-10
> Move number 3: gnubg to play 32
> GNU Backgammon Position ID: 2wIAAKuzqgIAAA
> Match ID : MIGpAAAAAAAA
> +12-11-10--9--8--7-------6--5--4--3--2--1-+ O: gnubg
> | O O O O O O | | O O O O O | 0 points
> | | | O O O | Rolled 32
> | | | O |
> | | | |
> | | | |
> ^| |BAR| | 5 point match (Cube: 1)
> | | | | X
> | | | | X
> | | | | XX
> | | | X X X | XX
> | | | X X X X | XX 0 points
> +13-14-15-16-17-18------19-20-21-22-23-24-+ X: snoren
> Pip counts: O 88, X 16
>
> Rolled 32: 1. Cubeful 0-ply 4/2 4/1 Eq.: -1,407
> 0,000 0,000 0,000 - 1,000 0,433 0,000
> 2. Cubeful 0-ply 9/6 8/6 Eq.: -1,432 ( -0,025)
> 0,000 0,000 0,000 - 1,000 0,459 0,000
> 3. Cubeful 0-ply 9/6 7/5 Eq.: -1,443 ( -0,036)
> 0,000 0,000 0,000 - 1,000 0,471 0,000
> 4. Cubeful 0-ply 12/10 9/6 Eq.: -1,446 ( -0,040)
> 0,000 0,000 0,000 - 1,000 0,475 0,000
> 5. Cubeful 0-ply 12/9 8/6 Eq.: -1,471 ( -0,065)
> 0,000 0,000 0,000 - 1,000 0,501 0,000
>
> Output generated Mon Nov 10 13:29:07 2008
> by GNU Backgammon 0.90-mingw (Text Export version 1.91)
>
>
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>
- [Bug-gnubg] Building GNU Backgammon on (K)Ubuntu 8.10, motiv4u, 2008/11/05
- Re: [Bug-gnubg] Building GNU Backgammon on (K)Ubuntu 8.10, Christian Anthon, 2008/11/05
- RE: [Bug-gnubg] Building GNU Backgammon on (K)Ubuntu 8.10, Jonathan Kinsey, 2008/11/05
- Re: [Bug-gnubg] Building GNU Backgammon on (K)Ubuntu 8.10, Christian Anthon, 2008/11/05
- [Bug-gnubg] Odd behavior during bearoff?, Zulli, Louis P, 2008/11/07
- [Bug-gnubg] Re: Odd behavior during bearoff?, Christian Anthon, 2008/11/07
- [Bug-gnubg] misevaluation on 0-ply, Sven-Olav Norén, 2008/11/10
- Re: [Bug-gnubg] misevaluation on 0-ply,
Joseph Heled <=
- Re: [Bug-gnubg] misevaluation on 0-ply, Christian Anthon, 2008/11/11
- [Bug-gnubg] Re: Odd behavior during bearoff?, Christian Anthon, 2008/11/11
- [Bug-gnubg] Re: Odd behavior during bearoff?, Zulli, Louis P, 2008/11/11