RE: [Bug-gnubg] Re: New Contact Net Error Rates

[Moore, Dave]

Jim Segrave wrote:

>This leads me to a point I've been wondering about. Everyone discusses
>gnubg having errors on odd ply evaluations. Can someone explain why
>this would be? I have always taken it on faith that this is true, but
>I'd like to understand the mechanism.


I have read on this list that it is because at odd-ply evaluations the NN is
evaluated from the other player's point of view, and this gives different
absolute equity results for some positions.

My naive interpretation:

For example, a position viewed from player 0's point of view may evaluate to
+0.600 equity, but the same position evaluated from the other side will
evaluate to -0.589 equity.


I also have two naive questions:

1.  Wouldn't it be possible to run the odd-ply evaluations while always
evaulating the board from player 0's point of view?  You would still go
through the possible dice and moves for player 1, but the move would be
selected by evaluating the resulting position from player 0's point of view,
always.  This would eliminate the jumps in absolute equity numbers.

-or- 

(very naive)
2.  Could positions that evaulate to different equity from different sides
of the board be used as training data so that the Net would converge to an
agreed upon answer when looking at things from either side of the board?


Thanks,
Dave






-- 
Jim Segrave           address@hidden



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