[Computer-go] Bayeisan/Probablistic Playouts in Computer Go

Nick Wedd nick at maproom.co.uk
Fri Sep 26 01:21:08 PDT 2014

I may be misunderstanding or misremembering - but I think that
CrazyStone used, maybe still uses, a shape library to assign
Bayesian priors.


On 25/09/2014 23:28, Alexander Terenin wrote:
> Hello everybody,
> I’m a PhD student in statistics at the University of California, Santa Cruz who previously worked on the Go program Orego, currently in the process of applying for the NSF fellowship. I am working on a Bayesian statistics - related research proposal that I would like to use in my application, and wanted to know if someone was aware of any research related to my topic that has been done.
> Currently, it seems most MCTS-based Go programs, in the playouts, treat the strength (win rate) of each move as a fixed, unknown value, which is then estimated using frequentist techniques (specifically, by playing a random game, and taking the estimate to be wins / total runs). Has anyone attempted to instead statistically estimate the strength of each move using Bayesian techniques, by defining a set of prior beliefs about the strength of a certain move, playing a random game, and then integrating the information gained from the random game together with the prior beliefs using Bayes' Rule? Equivalently, has anyone defined the strength of each move to be a random variable rather than a fixed and unknown value? Without making this email too long, there’s some theoretical advantages that might allow for more information to be extracted from each playout if this setup is used.
> If you are aware of any work in this direction that has been done, I would love to hear from you! I’ve been looking through a variety of papers, and have yet to find anything - it seems that any work remotely related to Bayes’ Rule has concerned the tree, not the playouts.
> Thank you in advance,
> Alex Terenin​
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Nick Wedd
nick at maproom.co.uk

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