HOW TO - Attemp a fix at rating bug(s)

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HOW TO - Attemp a fix at rating bug(s)

Postby spinastar » Wed Jul 30, 2014 8:11 am

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Last edited by spinastar on Sat Aug 26, 2017 4:05 pm, edited 2 times in total.
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Re: HOW TO - Attemp a fix at rating bug(s)

Postby Joriom » Wed Jul 30, 2014 6:39 pm

Sorry to disappoint you but VW is using Glicko2 which was based on Elo rating system and is considered improvement because it takes more factions into consideration. Due to Elos "easy implementation" (it was calculated with pen and paper for chees games!) it has some nasty flaws which would make it even worse then our current rating system (fe. easier to cheat). Since we're using computers to do the math, we can use complex systems but... they need to be sable and implement perfectly. My guess is there is some trivial (yet, hard to find) error in Lopdos Glicko2 implementation (dangerous int->float cast? rounding problem? db storage "corrupts" values? dunno) - not system fault.
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Re: HOW TO - Attemp a fix at rating bug(s)

Postby kingsniff » Wed Jul 30, 2014 7:31 pm

i agree with joriom on this.
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Re: HOW TO - Attemp a fix at rating bug(s)

Postby Lopdo » Thu Jul 31, 2014 11:03 pm

I went through my implementation at least 3 times in detail, I even rewrote it from scratch once, but the bug is still there. I tried to google it a bit and I found few people complaining about similar problems so perhaps it's not as stable as people think it is. This is however unlikely and there is either a bug in the implementation or I am using it wrong (there are few specifics that might be screwing with it, but I was careful when designing them... one can never know for sure tho)
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Re: HOW TO - Attemp a fix at rating bug(s)

Postby mattie » Thu Jul 31, 2014 11:11 pm

Lopdo wrote:I went through my implementation at least 3 times in detail, I even rewrote it from scratch once, but the bug is still there. I tried to google it a bit and I found few people complaining about similar problems so perhaps it's not as stable as people think it is. This is however unlikely and there is either a bug in the implementation or I am using it wrong (there are few specifics that might be screwing with it, but I was careful when designing them... one can never know for sure tho)


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Re: HOW TO - Attemp a fix at rating bug(s)

Postby Ratburntro44 » Fri Aug 01, 2014 12:40 am

Lopdo wrote:I went through my implementation at least 3 times in detail, I even rewrote it from scratch once, but the bug is still there. I tried to google it a bit and I found few people complaining about similar problems so perhaps it's not as stable as people think it is. This is however unlikely and there is either a bug in the implementation or I am using it wrong (there are few specifics that might be screwing with it, but I was careful when designing them... one can never know for sure tho)

Is there any chance it could have something to do with you making it impossible to lose point when you win? Just a wild guess.
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Re: HOW TO - Attemp a fix at rating bug(s)

Postby spinastar » Sat Aug 02, 2014 3:22 pm

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Re: HOW TO - Attemp a fix at rating bug(s)

Postby Lopdo » Sun Aug 03, 2014 2:38 pm

Ratburntro44 wrote:
Lopdo wrote:I went through my implementation at least 3 times in detail, I even rewrote it from scratch once, but the bug is still there. I tried to google it a bit and I found few people complaining about similar problems so perhaps it's not as stable as people think it is. This is however unlikely and there is either a bug in the implementation or I am using it wrong (there are few specifics that might be screwing with it, but I was careful when designing them... one can never know for sure tho)

Is there any chance it could have something to do with you making it impossible to lose point when you win? Just a wild guess.


It's possible, I really don't know. I guess I could do some experiments to determine where it goes wrong
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