TalkChess.com

AlvaroBegue wrote: ↑Tue Nov 28, 2017 8:37 pm [I downloaded games from CCRL, took positions from those games and analyzed them with my program RuyDos. I saved positions on which the evaluation function was being called after searching 1000 nodes. I then labelled each position by running one very quick SF8-vs-SF8 game.

https://bitbucket.org/alonamaloh/ruy_tu ... th_results

EDIT: In that file each position has been replaced by the position from which quiescence search got its score.

flok wrote: ↑Wed Jun 26, 2019 6:21 pm Something I forgot to ask:

for
totalError += pow(value_from_fen - calculateSigmoid(eval_score), 2);

value_from_fen = 1.0 for 1-0, 0.0 for 0-1 and so on

but eval_score, should it be from the point of view of the fen-string? or from white? or...?

Sven wrote: ↑Wed Jun 26, 2019 6:45 pm

flok wrote: ↑Wed Jun 26, 2019 6:21 pm Something I forgot to ask:

for
totalError += pow(value_from_fen - calculateSigmoid(eval_score), 2);

value_from_fen = 1.0 for 1-0, 0.0 for 0-1 and so on

but eval_score, should it be from the point of view of the fen-string? or from white? or...?

Obviously the sigmoid function (and therefore also eval_score) must represent a value from the same viewpoint as value_from_fen. Otherwise you would get a high "error" e.g. if value_from_fen = 1, it is black's turn, and your eval function returns a high score in favor of white so that the sigmoid function returns a value close to 0 (from black viewpoint).

Sven wrote: ↑Wed Jun 26, 2019 6:45 pm

flok wrote: ↑Wed Jun 26, 2019 6:21 pm Something I forgot to ask:

for
totalError += pow(value_from_fen - calculateSigmoid(eval_score), 2);

value_from_fen = 1.0 for 1-0, 0.0 for 0-1 and so on

but eval_score, should it be from the point of view of the fen-string? or from white? or...?

Obviously the sigmoid function (and therefore also eval_score) must represent a value from the same viewpoint as value_from_fen. Otherwise you would get a high "error" e.g. if value_from_fen = 1, it is black's turn, and your eval function returns a high score in favor of white so that the sigmoid function returns a value close to 0 (from black viewpoint).

Robert Pope wrote: ↑Wed Jun 26, 2019 7:18 pm It looks to me like you have a scale mismatch:
value_from_fen is in [0,1]
calculateSigmoid(eval_score) is in [-1,1].

Ratosh wrote: ↑Wed Jun 26, 2019 7:47 pm Eval value is always as white POV.

flok wrote: ↑Wed Jun 26, 2019 7:03 pm Ok, is what I thought to be honest but as the results are currently garbage, I wondered if I maybe did it wrong.

tune_bishop      325    -22
tune_bishop_count        25     3
tune_bishop_open_diagonal        25     95
tune_isolated_pawns      10     -1
tune_king_attacks        1      0
tune_knight      325    -6
tune_mobility    1      -1
tune_pawn        100    -29
tune_queen       975    44
tune_rook        500    61
tune_rook_on_open_file   15     -101
tune_too_many_pawns      -10    5
tune_zero_pawns  -10    5