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Excellent, I am glad you found the issue. I had a strong sense it
would be something like this.
This is a fairly common type of bug in software and is why I suggested
it, however I think it's the first time I've ever directed someone to
the specific line of code without having ever seen the code! (Of
course it was a wild stab in the dark.)
- - Don
Jason House wrote:
> On Fri, 2007-09-28 at 18:43 -0400, Don Dailey wrote:
>> Somewhere in your program I am sure there is a head-slapping error you
>> will find and when you do you will scream out loud! Don't give up.
>
> Yup... A nice little omission of casting.
>
> int nwins, nsims;
> ...
> double winRate = nwins/nsims;
> ...
> write("Picking move {} with win rate of", move, nwins*1.0/nsims);
>
>
> What kept me from seeing this immediately (AKA bot plays
> A1,A2,A3...A9,B1,B2...B9,C1...C9,...) is that there's logic that looks
> at two moves with the same winning rate and picks the one with the
> higher number of simulations. That can really help in non-AMAF
> implementations where the number of sims are low.
>
> It turns out that the code that I copied/pasted to make a quick AMAF bot
> used floating point numbers for nwins and nsims... My so-called monte
> carlo transposition reuse (MCTR) where they have to be floating point
> values.
>
> I kicked off hb-amaf-1k-v2. While it lost its first game online, it's
> play was WAY better than it has been. It's rating will certainly settle
> much higher.
>
> I hope that was the issue and there are no more biggies like that! This
> discussion was very helpful for me to dig up all kinds of small bugs in
> other parts of my code. Once I confirm this is the big bug, I'll try
> variants with the different handling to see how that affects the rating
> (I'd call all past tests of variations worthless given the nature of
> this bug)
>
> While this may give an 800 ELO boost to the AMAF bot, I'm disappointed
> that it won't help my other versions like that. The other changes dug
> up in this long discussion will likely give them some boost though.
>
> _______________________________________________
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> http://www.computer-go.org/mailman/listinfo/computer-go/
>
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