Author: Robert Hyatt
Date: 09:43:25 01/14/04
Go up one level in this thread
On January 14, 2004 at 11:32:11, Bob Durrett wrote: >On January 14, 2004 at 09:24:06, Robert Hyatt wrote: > >>On January 14, 2004 at 06:36:38, Chris Taylor wrote: >> >>>Why, what are the for and against? >>>I play mainly auto232; and have quite a lot of games. As a result, had I not >>>cleared learning, what would this mean. >> >>What will happen is that your book will dry up and go away. You _must_ lose >>a game with nearly every opening at some point in time, and without some >>caution, >>that will make that line unplayable. And once it is unplayable, there is no way >>for it to become playable again, without your intervention. > >Perhaps it not is not merely a joke to characterize Crafty's automatic opening >book learning as: "Snip, snip, snip!" Correct. as well as _any_ program that uses "result learning". IE Fritz. When it loses, it flags part of that line with "don't ever play again." > >If, instead of outright snipping, the probabilities were merely adjusted by some >small amount then the phenomena you describe might not happen, or at least not >as often. It seems to be a matter of stability. If there is no human >intervention then things could go terribly wrong! Crafty does both. IE it can just learn by playing the game and adjusting the book after it has been out a while, and looking at the scores. Or it does result learning so that if it wins it will play it again, and if it loses, it will not. You can select either/or/both, but using result learning has the catch-all glitch I mentioned. > >Bob H., in a previous bulletin you provided a "thumbnail sketch" of the criteria >Crafty uses to determine whether or not to "snip." If I understood it >correctly, you said that the engine monitored the position evaluation scores as >soon as the program was out of the opening book and if the evaluation changed >adversely by a certain amount over the next five or ten moves, then Crafty >snipped. If so, the final outcome of the game has no impact on book learning in >Crafty. Did I get that right? Partially. That is one learning mode. "book learning". There is another more harsh version called "result learning". Here, if it wins or loses after playing a particular opening, it will repeat or avoid that line depending on the game result, which is more "violent" than the simple book learning. > >Bob D. > > >> >> >>> >>>There are different guis' and engines all handling this in varied ways. So, is >>>it possible to gereralise? >>> >>>My PIII 733 has been playing 7 mins games; eng - eng, for about 3 months. Is >>>there any reason to clear the book learnings? >> >>If you start playing longer time controls, yes... >> >>> >>>Opinions please! Both for and against >>> >>>Chris Taylor
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