I have tested the prunning quite a lot, and do not remember even one case where it was detrimental in any significant way.
-Joseph On Wed, Aug 5, 2009 at 9:18 AM, Christian Anthon<[email protected]> wrote: > This is quite odd. My local linux version doesn't seem to have this > problem. Anybody with their own builds having this problem? > > Christian. > > On Tue, Aug 4, 2009 at 10:56 PM, Christopher Yep<[email protected]> wrote: >> It looks like you are correct; the problem is due to pruning. >> >> Using a recent build (0.90-mingw 20090721): >> >> With pruning turned off, gnubg gets the correct backgammon values for both >> moves (21/17 19/18: 8.5%, 20/16 19/18: 9.3%) at all plies (0-ply, 1-ply, >> ..., 7-ply). >> >> With pruning turned on, gnubg gets the correct backgammon values at 0-ply, >> 1-ply, and 5-ply, but gets incorrect backgammon values (21/17 19/18: 16.6% >> BGs, 20/16 19/18: 12.4% BGs) at 2-ply, 3-ply, 4-ply, 6-ply, and 7-ply. It's >> strange that gnubg gets it correct at 5-ply, but not 6-ply or 7-ply, but >> note that the game always ends by the end of the 5th ply (the top player is >> guaranteed to bear off in 3 rolls). >> >> How much slower is gnubg when pruning is turned off in racing positions? >> >> Chris >> >> At 03:44 PM 8/4/2009, Michael Petch wrote: >>> >>> Howdy Team, >>> >>> I find that a lot of the fringe cases (with such incorrect results) like >>> this usually occur on the race evaluator near end games. If this is a >>> result >>> of pruning, maybe we might consider not pruning when the race evaluator is >>> being used? >>> >>> On 04/08/09 1:23 PM, "Michael Petch" <[email protected]> wrote: >>> >>> > This is cross-posted to bgonline: >>> > >>> > We call it "Gnu Math"? >>> > >>> > On a serious note this seems like a prime example of neurel net pruning >>> > at >>> > its worst. I don't have GnuBG handy but what do you get by turning >>> > "Pruning" >>> > off? I recently had a discussion with Neil Kaz (I think it was Neil - >>> > but if >>> > it wasn't, it was another world class player) - about the settings I use >>> > in >>> > Gnubg. Besides using a Huge Filter I spend the extra time and turn the >>> > pruning off. I've seen this type of thign before. >>> > >>> > Has anyone tried the position without pruning? Sorry I can't test it >>> > from >>> > here. >>> > >>> > >>> > On 04/08/09 12:45 PM, "[email protected]" <[email protected]> wrote: >>> > >>> >> http://www.bgonline.org/forums/webbbs_config.pl?noframes;read=45761 >>> >> >>> > >> >> >> >> _______________________________________________ >> Bug-gnubg mailing list >> [email protected] >> http://lists.gnu.org/mailman/listinfo/bug-gnubg >> > > > _______________________________________________ > Bug-gnubg mailing list > [email protected] > http://lists.gnu.org/mailman/listinfo/bug-gnubg > _______________________________________________ Bug-gnubg mailing list [email protected] http://lists.gnu.org/mailman/listinfo/bug-gnubg
