Author: Aaron Tay
Date: 23:49:49 11/18/00
Go up one level in this thread
On November 19, 2000 at 01:47:13, pavel wrote: >On November 18, 2000 at 23:40:08, Dan Homan wrote: > >>On November 18, 2000 at 23:23:27, Brian Richardson wrote: >> >>>On November 18, 2000 at 23:06:36, Dan Homan wrote: >>> >>>>I've just put a new version of EXchess up on my website: >>>> >>>>http://pc.astro.brandeis.edu/BRAG/people/dch/chess.html >>>> >>>>The new version (v4.01) adds Temporal Difference evaluation learning to the >>>>previous version (v3.14). I am not sure that this really increases the strength >>>>of the program, but it was fun to work on. There are a couple of other minor >>>>enhancements to the search and opening book code. >>>> >>>> - Dan >>> >>>About how many games with TD learning have been played and did it change your >>>evaluation function much? >> >> >>I've played hundreds of games, but I've also reset the learned values back to >>the original parameters many times as well. For the parameters which come with >>the released version, I am not sure how many games contribute. Another wrinkle >>is that the program only 'learns' after a loss, so the number of 'learning >>games' is smaller than the number of games played. >> >>One consistent result is that TD learning wants a smaller value for passed >>pawns than I was using before (about 75% of my original 'hand-tuned' value). >>Also my knight-outpost and bishop-outpost values are consistently increased >>by the TD learning by a factor of 3 or 4. >> >> - Dan >can you elavorate TD learning? >as far as I know, it fixes value after each game. > >is there any file generated by the program as a .lrn file, which increases after >game? >or the eval is tuned externally? > > >pavs There is a score.par file that changes after each loss. But I don't see anyway to combine learning from other sources much like you can import learning from other sources for crafty's book.. Is there a way? Otherwise if each new version of EXchess came with a new score.par file , does that mean the learning each user has will be tossed out? I'm also curious about how Exchess decides what to tune after each loss. How does it "know" what evalution scores to change? I will run 100 blitz games first vers various strong opponents (to maximise losses..:( !! ) and see how the score.par changes. Currently, i see the passed pawn value dropping quite significantly and knight outpost values increasing inline with what the author found..
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