Re: [Bug-gnubg] New build of GNU Backgammon for Windows available!

[Joseph Heled]

I read your description of the pruning nets and I think some uninformed readers 
might get the wrong impression. One might think that pruning is done at the top 
level, i.e that some moves are filtered away and never evaluated by the main 
nets. This is not correct - it is the job of the move filters, which I think do 
it in a good and flexible manner. (plug: of course I think so. I invented them 
and introduced them to GNUbg. Probably re-invented them, but never mind).
So every move is considered by at least 0-ply. We get away with that because 
0-ply is so strong. The pruning net comes to play in higher plies (1, 2 etc), 
where it helps when choosing a move *inside a higher ply evaluation*. As you all 
know, even thou a 2-ply is composed of "only" 441 evaluations, one has to do 
between 4000 to 5000 evaluations on average (after taking advantage of caching) 
to get that result.

-Joseph


Øystein Johansen wrote:
> PLEASE READ!
> If you read this it will save you and me for a lot of trouble!
> PLEASE READ!
>
> Joseph has commited his smaller pruning neural nets to the main part of
> GNU Backgammon! That's good news. Really good news!
>
> If you use Windows as you operating system, and want to try this, you
> should try it from http://www.gnubg.org/index.php?itemid=28
>
> If you want to try it you *must* first get and install the installation
> here: http://www.gnubg.org/downloadwin.php
>
> Don't try with one of my old packages, because that won't work!
>
> You *should* install the prune neural net archive into the same
> directory. Some files in your install directory will be overwritten.
> These files are: gnubg.exe, gnubg-no-gui.exe and gnubg.wd. It can be
> smart to backup these files.
>
> You can also read the article I just wrote about this fantastic
> improvment to GNU Backgammon. http://www.gnubg.org/index.php?itemid=28
>
> Note the buttom line warning!
>
> Good Luck!
> -Øystein
>
> PS: Rolf, amarganth, you should get this build, since the python module
> contains the two new methods: gnubg.cfevaluate() and gnubg.findbestmove()

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