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Re: [Bug-gnubg] Neural network symmetry question
From: |
Mark Higgins |
Subject: |
Re: [Bug-gnubg] Neural network symmetry question |
Date: |
Sat, 10 Dec 2011 14:22:43 -0500 |
Thx! Makes sense. Though I wonder if adding back in the "whose move is it"
input and reducing the hidden->output weights by half ends up as a net benefit
for training. Maybe I'll test it out.
On Dec 10, 2011, at 2:06 PM, Frank Berger <address@hidden> wrote:
> Hi Mark,
>
>> If I take a given board and translate the position into the inputs and then
>> evaluate the network, it gives me a probability of win. If I then flip the
>> board's perspective (ie white vs black) and do the same, I get another
>> probability of win. Those two probabilities should sum to 1, since one or
>> the other player must win (or equivalently, the probability of white winning
>> = probability of black losing = 1 - probability of black winning).
>
>
> I assume your assumption is wrong. IIRC in an earlier paper there was an
> input to indicate who's on. It is much simpler to present the position from
> the point of the moving player, because the net has to learn less. I'm not
> that familiar with the gnubg code, but I think they do it in this way, so you
> can't just turn the perspective.
>
> ciao
> Frank
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- [Bug-gnubg] Neural network symmetry question, Mark Higgins, 2011/12/09
- [Bug-gnubg] Neural network symmetry question, Frank Berger, 2011/12/10
- Re: [Bug-gnubg] Neural network symmetry question,
Mark Higgins <=
- Re: [Bug-gnubg] Neural network symmetry question, Mark Higgins, 2011/12/11
- Re: [Bug-gnubg] Neural network symmetry question, Joseph Heled, 2011/12/11
- Re: [Bug-gnubg] Neural network symmetry question, Mark Higgins, 2011/12/11
- Re: [Bug-gnubg] Neural network symmetry question, Mark Higgins, 2011/12/12
- Re: [Bug-gnubg] Neural network symmetry question, Ã˜ystein SchÃ¸nning-Johansen, 2011/12/12
- Re: [Bug-gnubg] Neural network symmetry question, Ian Shaw, 2011/12/16
- Re: [Bug-gnubg] Neural network symmetry question, Thomas A. Moulton, 2011/12/16
- Re: [Bug-gnubg] Neural network symmetry question, Ian Shaw, 2011/12/16
- Re: [Bug-gnubg] Neural network symmetry question, Joseph Heled, 2011/12/16