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Blend nnue complexity with classical.

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Following mstembera's test of the complexity value derived from nnue values,
this change blends that idea with the old complexity calculation.

STC 10+0.1:
LLR: 2.95 (-2.94,2.94) <0.00,2.50>
Total: 42320 W: 11436 L: 11148 D: 19736
Ptnml(0-2): 209, 4585, 11263, 4915, 188
https://tests.stockfishchess.org/tests/live_elo/6295c9239c8c2fcb2bad7fd9

LTC 60+0.6:
LLR: 2.98 (-2.94,2.94) <0.50,3.00>
Total: 34600 W: 9393 L: 9125 D: 16082
Ptnml(0-2): 32, 3323, 10319, 3597, 29
https://tests.stockfishchess.org/tests/view/6295fd5d9c8c2fcb2bad88cf

closes https://github.com/official-stockfish/Stockfish/pull/4046

Bench 6078140
This commit is contained in:
xoto10
2022-06-01 01:20:27 +01:00
committed by Joost VandeVondele
parent 653bd0817c
commit 7f1333ccf8
3 changed files with 12 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
src/evaluate.cpp
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@@ -1099,15 +1099,16 @@ Value Eval::evaluate(const Position& pos) {
// If result of a classical evaluation is much lower than threshold fall back to NNUE
if (useNNUE && !useClassical)
{
Value nnue = NNUE::evaluate(pos, true); // NNUE
int scale = 1080 + 110 * pos.non_pawn_material() / 5120;
int complexity;
int scale = 1048 + 109 * pos.non_pawn_material() / 5120;
Color stm = pos.side_to_move();
Value optimism = pos.this_thread()->optimism[stm];
Value psq = (stm == WHITE ? 1 : -1) * eg_value(pos.psq_score());
int complexity = (278 * abs(nnue - psq)) / 256;
Value nnue = NNUE::evaluate(pos, true, &complexity); // NNUE
optimism = optimism * (251 + complexity) / 256;
v = (nnue * scale + optimism * (scale - 852)) / 1024;
complexity = (137 * complexity + 137 * abs(nnue - psq)) / 256;
optimism = optimism * (255 + complexity) / 256;
v = (nnue * scale + optimism * (scale - 848)) / 1024;
if (pos.is_chess960())
v += fix_FRC(pos);

2
src/evaluate.h
View File

@@ -44,7 +44,7 @@ namespace Eval {
namespace NNUE {
std::string trace(Position& pos);
Value evaluate(const Position& pos, bool adjusted = false);
Value evaluate(const Position& pos, bool adjusted = false, int* complexity = nullptr);
void init();
void verify();

7
src/nnue/evaluate_nnue.cpp
View File

@@ -137,7 +137,7 @@ namespace Stockfish::Eval::NNUE {
}
// Evaluation function. Perform differential calculation.
Value evaluate(const Position& pos, bool adjusted) {
Value evaluate(const Position& pos, bool adjusted, int* complexity) {
// We manually align the arrays on the stack because with gcc < 9.3
// overaligning stack variables with alignas() doesn't work correctly.
@@ -161,9 +161,12 @@ namespace Stockfish::Eval::NNUE {
const auto psqt = featureTransformer->transform(pos, transformedFeatures, bucket);
const auto positional = network[bucket]->propagate(transformedFeatures);
if (complexity)
*complexity = abs(psqt - positional) / OutputScale;
// Give more value to positional evaluation when adjusted flag is set
if (adjusted)
return static_cast<Value>(((128 - delta) * psqt + (128 + delta) * positional) / 128 / OutputScale);
return static_cast<Value>(((128 - delta) * psqt + (128 + delta) * positional) / (128 * OutputScale));
else
return static_cast<Value>((psqt + positional) / OutputScale);
}