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NNUE evaluation threshold

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The idea is to use NNUE only on quite balanced material positions. This bring a big speedup on research since NNUE eval is slower than classical eval for most of the hardwares and specially on unbalanced positions with LazyEval.

STC: https://tests.stockfishchess.org/tests/view/5f2c2680b3ebe5cbfee85b61
LLR: 2.95 (-2.94,2.94) {-0.50,1.50}
Total: 3168 W: 560 L: 400 D: 2208
Ptnml(0-2): 21, 294, 819, 404, 46

LTC: https://tests.stockfishchess.org/tests/view/5f2c2ca6b3ebe5cbfee85b69
LLR: 2.98 (-2.94,2.94) {0.25,1.75}
Total: 3200 W: 287 L: 183 D: 2730
Ptnml(0-2): 4, 149, 1191, 251, 5

closes https://github.com/official-stockfish/Stockfish/pull/2916

Bench 4746616
This commit is contained in:
MJZ1977 2020-08-06 17:39:10 +02:00 • committed by Joost VandeVondele
parent 84f3e86790
commit 3dca13a958
1 changed files with 11 additions and 5 deletions
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16
src/evaluate.cpp
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@ -107,9 +107,10 @@ using namespace Trace;
namespace {
// Threshold for lazy and space evaluation
constexpr Value LazyThreshold1 = Value(1400);
constexpr Value LazyThreshold2 = Value(1300);
constexpr Value LazyThreshold1 = Value(1400);
constexpr Value LazyThreshold2 = Value(1300);
constexpr Value SpaceThreshold = Value(12222);
constexpr Value NNUEThreshold = Value(500);
// KingAttackWeights[PieceType] contains king attack weights by piece type
constexpr int KingAttackWeights[PIECE_TYPE_NB] = { 0, 0, 81, 52, 44, 10 };
@ -941,9 +942,14 @@ make_v:
Value Eval::evaluate(const Position& pos) {
if (Eval::useNNUE)
return NNUE::evaluate(pos);
else
return Evaluation<NO_TRACE>(pos).value();
{
Value balance = pos.non_pawn_material(WHITE) - pos.non_pawn_material(BLACK);
balance += 200 * (pos.count<PAWN>(WHITE) - pos.count<PAWN>(BLACK));
// Take NNUE eval only on balanced positions
if (abs(balance) < NNUEThreshold)
return NNUE::evaluate(pos);
}
return Evaluation<NO_TRACE>(pos).value();
}
/// trace() is like evaluate(), but instead of returning a value, it returns