[computer-go] Mogo scalability

[Don Dailey]

David Fotland wrote:
> The scalability study showed that mogo gains almost 100 rating points per
> doubling of performance.
>
> But on CGOS, there is mogo 1 CPU and mogo 4 CPU.  I would expect the 4 CPU
> mogo to be 150 rating points or more higher than 1 CPU.  But it is actually
> only 40 points higher.
>
> I guess this is because in the rating study mogo was mostly playing other
> mogo versions.  A the faster mogo can see everything the weaker mogo sees,
> and more.
>
> But against other programs on CGOS, there will be weaknesses common to both
> fast and slow mogo, that other programs might exploit.
>
> Is the true scalability of mogo (against a variety of programs, or against
> people) less than the rating study indicates?
>   
It's possible.  Most people believe that when the only difference 
between 2 programs is how deep they look,  the less deep version gets 
victimized fairly badly.    I'm undecided about how strong this effect 
is,  although I do believe it's a factor.

On CGOS  most of the programs, while not identical, are very 
similar.     Does that also have an impact on the rating pool?  If that 
is impacting it too, that would decrease the mogo vs mogo effect.   

The rating study includes games against Leela too.   Next week when I 
get back from my vacation,  I will try voiding games not played between 
different opponents, and see how it affects the curve.    It probably 
won't answer any questions but it might be a clue.

- Don

  

> David
>
>
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