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Update WLD model

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update the WLD model with about 400M positions extracted from recent LTC games after the net updates.
This ensures that the 50% win rate is again at 1.0 eval.

closes https://github.com/official-stockfish/Stockfish/pull/4373

No functional change.
This commit is contained in:
Joost VandeVondele 2023-02-02 08:41:32 +01:00
parent 7fc0f589d6
commit 3589bd008a
2 changed files with 3 additions and 3 deletions
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4
src/uci.cpp
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@ -206,8 +206,8 @@ 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[] = { -0.58270499, 2.68512549, 15.24638015, 344.49745382};
constexpr double bs[] = { -2.65734562, 15.96509799, -20.69040836, 73.61029937 };
constexpr double as[] = { 0.33677609, -4.30175627, 33.08810557, 365.60223431};
constexpr double bs[] = { -2.50471102, 14.23235405, -14.33066859, 71.42705250 };
// 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
View file

@ -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 = 361;
const int NormalizeToPawnValue = 394;
class Option;