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## [Bug-gnubg] Neural network symmetry question

**From**: |
Frank Berger |

**Subject**: |
[Bug-gnubg] Neural network symmetry question |

**Date**: |
Sat, 10 Dec 2011 20:06:57 +0100 |

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

**[Bug-gnubg] Neural network symmetry question**, *Mark Higgins*, `2011/12/09`
**[Bug-gnubg] Neural network symmetry question**,
*Frank Berger* **<=**
**Re: [Bug-gnubg] Neural network symmetry question**, *Mark Higgins*, `2011/12/10`
**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`