Re: [Bug-gnubg] Re: gnubg bug?

[Joseph Heled]

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<address@hidden> 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<address@hidden> 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" <address@hidden> 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, "address@hidden" <address@hidden> wrote:
>>> >
>>> >> http://www.bgonline.org/forums/webbbs_config.pl?noframes;read=45761
>>> >>
>>> >
>>
>>
>>
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