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Re: [Bug-gnubg] An old bug and possible neural nets input change

From: Philippe Michel
Subject: Re: [Bug-gnubg] An old bug and possible neural nets input change
Date: Thu, 6 Jun 2019 00:20:45 +0200
User-agent: Mutt/1.12.0 (2019-05-25)

Interesting diagram. I suppose the hc_0 and hc_1 prefixes mean the 
inputs are for the player on roll and for the other respectively ?

The sum of the values seems to be about 0.5. Should the sum be 1 and the 
basic inputs amount for the complement ? If this is the case, do you 
have the actual sum for the listed inputs ?

PIPLOSS for one of the players is indeed at the top of the list, but 
aggregated for both players MOBILITY seems to be about equal. The second 
one, ENTER is interesting, it is 0 when the player doesn't have a man on 
the bar so, when it matters, it may well be the most important input.

The first random ideas that come to mind :

- could it worthwile to add a few of the complex features like MOBILITY and 
ENTER to the pruning nets ?

- the paper by Berliner mentionned by Ian in another follow-up describes 
his efforts to improve PIPLOSS from a simple but not that good algorithm 
to more or less what we have. Since, according to your analysis, the 
value of this input is very asymetrical between the players, maybe a 
simpler version could be used for at least one of them. That's assuming 
one can come up with something approximate that is much faster but not 
too less accurate.

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