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Simplify nnue eval complexity calculation

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Remove a multiplier when blending nnue complexity with semi-classical complexity.

Passed non-regression STC:
https://tests.stockfishchess.org/tests/view/6473a71dd29264e4cfa75839
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 124768 W: 33180 L: 33060 D: 58528
Ptnml(0-2): 314, 13797, 34030, 13941, 302

Passed non-regression LTC:
https://tests.stockfishchess.org/tests/view/6474af3dd29264e4cfa768f4
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 108180 W: 29008 L: 28884 D: 50288
Ptnml(0-2): 29, 10420, 33075, 10530, 36

closes https://github.com/official-stockfish/Stockfish/pull/4592

bench 2316827
This commit is contained in:
Linmiao Xu
2023-05-28 14:45:24 -04:00
committed by Joost VandeVondele
parent c1fff71650
commit 07bd8adcbc
1 changed files with 1 additions and 3 deletions
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4
src/evaluate.cpp
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@@ -1071,9 +1071,7 @@ Value Eval::evaluate(const Position& pos) {
Value nnue = NNUE::evaluate(pos, true, &nnueComplexity); Value nnue = NNUE::evaluate(pos, true, &nnueComplexity);
// Blend nnue complexity with (semi)classical complexity // Blend nnue complexity with (semi)classical complexity
nnueComplexity = ( 397 * nnueComplexity nnueComplexity = 25 * (nnueComplexity + abs(psq - nnue)) / 64;
+ 477 * abs(psq - nnue)
) / 1024;
optimism += optimism * nnueComplexity / 256; optimism += optimism * nnueComplexity / 256;
v = (nnue * (945 + npm) + optimism * (174 + npm)) / 1024; v = (nnue * (945 + npm) + optimism * (174 + npm)) / 1024;