Author: Robert Hyatt
Date: 10:23:31 11/10/03
Go up one level in this thread
On November 10, 2003 at 12:52:57, Bryan Hofmann wrote: >On November 10, 2003 at 12:36:46, Robert Hyatt wrote: > >>On November 10, 2003 at 11:33:17, Bryan Hofmann wrote: >> >>>A few questions as I have seached high and low and have not found any answers to >>>these; >>> >>>1. When preforming a "make profile" (with gcc) do you use the book.bin and >>>books.bin files? >> >>Yes, although there is no need to do so. I have one book position in the >>profile positions to produce profile information for the book selection code. >>Why, I don't know, since this is not exactly time-critical code. :) > >I'm not sure I follow you with the one book position... I compiled crafty the >first time without the profile and created a book.bin from you gm2600.pgn file. >Should I be using this book.bin with the make profile? Also how long does it >take to compile with the profile (it has been running now for more then 2 hours >on a quad 450mhz, it is running the last runprof command and is at depth 15 even >tho the st=10)??? > Which book you use really doesn't matter. The point of the profile run is to simply execute most of the code so that the branch probabilities can be discovered and used to further optimize the executable on the second build. make sure you have a "ponder=off" in your .craftyrc/crafty.rc file. If not, the test will hang as you are seeing. > >> >>> >>>2. How can you make Crafty learn from a EPD after it has performed an analysis? >>>(ie import into the book.lrn). >> >>I am not sure what you are asking about. When crafty plays a game, it >>automatically learns and updates the book.bin file. the book.lrn file is >>just an ascii representation of what it learned that can be given to other >>Crafty users, or whatever. You can use the "import" command but there is >>no need as it has already been included in the book.bin information. >> > >I downloaded a CCC.EPD file that was created that lead to mating. If I run the >epdpfga <infile> <outfile> I get the analysis but there is no change to the >book.bin nor the book.lrn. >> Those don't affect the book, as they are not book positions... >> >> >>> >>>3. When creating a book file (from the gm2600.pgn on Dr. Hyatt's site) is is >>>better to do a 60 2 100 or a 60 2 50 for stronger performance? >>> >> >>Here is the issue. For every move played in a game, there is a probability >>that it is either not best, or even that it is an outright blunder made near >>a time control. If you limit the book lines to something pretty short, you >>tend to reduce the probability that your "game" has an error in it, for >>obvious reasons. The shorter, the less chance there is a gross blunder. Of >>course, if you reduce the length to zero you are _certain_ there are no >>blunders. :) >> >>I tend to use 50 as the normal number for my books. But it is probably >>irrelevant if you use the "played N times" value. IE here is the way I >>build the book I use on ICC: >> >>book create file.pgn 60 10 50 >> >>This says create a file with each line being no longer than 60 plies, >>each move played at least 10 times (at least 10 games have this move >>in this position played) and at least 50% of the games were won by the >>side to move. >> >>That makes the book fairly reliable, and also fairly small. >> >>That's how the book.bin file on my ftp machine was made from the >>enormous.pgn file also located there. This produces a 13 mb book >>file which is managable and pretty reliable. >> > >Great!! This is the info I was looking for... Also thanks for creating a great >chess engine with source code available to all! > > >Bryan > >> >> >> >>> >>>Thanks >>> >>>Bryan
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