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Update WLD model

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using data of May, recalibrate the WLD model.

closes https://github.com/official-stockfish/Stockfish/pull/4577

No functional change
This commit is contained in:
Joost VandeVondele 2023-05-19 23:02:27 +02:00
parent 65e2150501
commit 5f7b26aaa0
2 changed files with 3 additions and 3 deletions
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4
src/uci.cpp
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@ -207,8 +207,8 @@ namespace {
// The coefficients of a third-order polynomial fit is based on the fishtest data
// for two parameters that need to transform eval to the argument of a logistic
// function.
constexpr double as[] = { 0.33677609, -4.30175627, 33.08810557, 365.60223431};
constexpr double bs[] = { -2.50471102, 14.23235405, -14.33066859, 71.42705250 };
constexpr double as[] = { 1.07390458, -6.94334517, 31.95090161, 317.75424048};
constexpr double bs[] = { -2.82843814, 16.64518180, -19.74439200, 68.39499088 };
// Enforce that NormalizeToPawnValue corresponds to a 50% win rate at ply 64
static_assert(UCI::NormalizeToPawnValue == int(as[0] + as[1] + as[2] + as[3]));

2
src/uci.h
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@ -35,7 +35,7 @@ namespace UCI {
// the win_rate_model() such that Stockfish outputs an advantage of
// "100 centipawns" for a position if the engine has a 50% probability to win
// from this position in selfplay at fishtest LTC time control.
const int NormalizeToPawnValue = 394;
const int NormalizeToPawnValue = 343;
class Option;