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Re: [Bug-gnubg] Doubts about the new pruning net

From: Joseph Heled
Subject: Re: [Bug-gnubg] Doubts about the new pruning net
Date: Fri, 05 Nov 2004 15:43:24 +1300
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7) Gecko/20040616

Robert-Jan Veldhuizen wrote:

 >I run the benchmark overnight and I get for 13294 moves
 >Pruning 124 differences to full 2ply, error 0.00726047 vs. 0.00725554
 >Reduced33% 914 differences error 0.00755261

I don't know what these figures mean. What benchmark are you running? One position rolled out many trials, or many different positions evaluated? The real problems I'm getting are with rollouts.

Are the differences you report for checker play, cube or both? Is it money play, or also matchplay?

The benchmark is the standard benchmark we all rolled together. made of positions, where top moves are rolled out for one dice

This is a later number,
                               full-2ply error per move    2p-prune  33%-reduced

154,1177/17342 (0.009 0.068)           0.00714507        0.00715006 0.00746464
^     ^    |   (as percentages)
|     |    |
Number|of t|imes 2ply-pruning disagrees with full 2-ply
      |    |
      Numbe|r of times 2ply-33% reduced disagrees with full 2-ply
           Number of positions checked

As you can see pruning error differ from full by 0.000005, and reduced by 0.00032, almost two orders of magnitude.


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