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Code Issues Releases Wiki Activity

Give positional output more weight in nnue eval

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This effectively reverts the removal of delta in:
https://github.com/official-stockfish/Stockfish/pull/5373

Passed STC:
https://tests.stockfishchess.org/tests/view/6664d41922234461cef58e6b
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 56448 W: 14849 L: 14500 D: 27099
Ptnml(0-2): 227, 6481, 14457, 6834, 225

Passed LTC:
https://tests.stockfishchess.org/tests/view/666587a1996b40829f4ee007
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 91686 W: 23402 L: 22963 D: 45321
Ptnml(0-2): 78, 10205, 24840, 10640, 80

closes https://github.com/official-stockfish/Stockfish/pull/5382

bench 1160467
This commit is contained in:
Linmiao Xu 2024-06-08 14:57:09 -07:00 • committed by Joost VandeVondele
parent 7013a22b74
commit 025da6a0d1
1 changed files with 2 additions and 2 deletions
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4
src/evaluate.cpp
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@ -66,14 +66,14 @@ Value Eval::evaluate(const Eval::NNUE::Networks& networks,
auto [psqt, positional] = smallNet ? networks.small.evaluate(pos, &caches.small)
: networks.big.evaluate(pos, &caches.big);
Value nnue = psqt + positional;
Value nnue = (125 * psqt + 131 * positional) / 128;
int nnueComplexity = std::abs(psqt - positional);
// Re-evaluate the position when higher eval accuracy is worth the time spent
if (smallNet && (nnue * simpleEval < 0 || std::abs(nnue) < 227))
{
std::tie(psqt, positional) = networks.big.evaluate(pos, &caches.big);
nnue = psqt + positional;
nnue = (125 * psqt + 131 * positional) / 128;
nnueComplexity = std::abs(psqt - positional);
smallNet = false;
}