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
