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Reduce the number of accumulator states

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Reduce from 3 to 2. Make the intent of the states clearer.

STC: https://tests.stockfishchess.org/tests/view/60c50111457376eb8bcaad03
LLR: 2.95 (-2.94,2.94) <-2.50,0.50>
Total: 61888 W: 5007 L: 4944 D: 51937
Ptnml(0-2): 164, 3947, 22649, 4030, 154

LTC: https://tests.stockfishchess.org/tests/view/60c52b1c457376eb8bcaad2c
LLR: 2.94 (-2.94,2.94) <-2.50,0.50>
Total: 20248 W: 688 L: 618 D: 18942
Ptnml(0-2): 7, 551, 8946, 605, 15

closes https://github.com/official-stockfish/Stockfish/pull/3548

No functional change.
This commit is contained in:
Tomasz Sobczyk 2021-06-12 20:45:14 +02:00 • committed by Joost VandeVondele
parent f8c779dbe5
commit 900f249f59
3 changed files with 10 additions and 15 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

5
src/nnue/nnue_accumulator.h
View file

@ -25,14 +25,11 @@
namespace Stockfish::Eval::NNUE {
// The accumulator of a StateInfo without parent is set to the INIT state
enum AccumulatorState { EMPTY, COMPUTED, INIT };
// Class that holds the result of affine transformation of input features
struct alignas(CacheLineSize) Accumulator {
std::int16_t accumulation[2][TransformedFeatureDimensions];
std::int32_t psqtAccumulation[2][PSQTBuckets];
AccumulatorState state[2];
bool computed[2];
};
} // namespace Stockfish::Eval::NNUE

10
src/nnue/nnue_feature_transformer.h
View file

@ -383,7 +383,7 @@ namespace Stockfish::Eval::NNUE {
// of the estimated gain in terms of features to be added/subtracted.
StateInfo *st = pos.state(), *next = nullptr;
int gain = FeatureSet::refresh_cost(pos);
while (st->accumulator.state[perspective] == EMPTY)
while (st->previous && !st->accumulator.computed[perspective])
{
// This governs when a full feature refresh is needed and how many
// updates are better than just one full refresh.
@ -394,7 +394,7 @@ namespace Stockfish::Eval::NNUE {
st = st->previous;
}
if (st->accumulator.state[perspective] == COMPUTED)
if (st->accumulator.computed[perspective])
{
if (next == nullptr)
return;
@ -412,8 +412,8 @@ namespace Stockfish::Eval::NNUE {
ksq, st2, perspective, removed[1], added[1]);
// Mark the accumulators as computed.
next->accumulator.state[perspective] = COMPUTED;
pos.state()->accumulator.state[perspective] = COMPUTED;
next->accumulator.computed[perspective] = true;
pos.state()->accumulator.computed[perspective] = true;
// Now update the accumulators listed in states_to_update[], where the last element is a sentinel.
StateInfo *states_to_update[3] =
@ -533,7 +533,7 @@ namespace Stockfish::Eval::NNUE {
{
// Refresh the accumulator
auto& accumulator = pos.state()->accumulator;
accumulator.state[perspective] = COMPUTED;
accumulator.computed[perspective] = true;
IndexList active;
FeatureSet::append_active_indices(pos, perspective, active);

10
src/position.cpp
View file

@ -282,8 +282,6 @@ Position& Position::set(const string& fenStr, bool isChess960, StateInfo* si, Th
chess960 = isChess960;
thisThread = th;
set_state(st);
st->accumulator.state[WHITE] = Eval::NNUE::INIT;
st->accumulator.state[BLACK] = Eval::NNUE::INIT;
assert(pos_is_ok());
@ -704,8 +702,8 @@ void Position::do_move(Move m, StateInfo& newSt, bool givesCheck) {
++st->pliesFromNull;
// Used by NNUE
st->accumulator.state[WHITE] = Eval::NNUE::EMPTY;
st->accumulator.state[BLACK] = Eval::NNUE::EMPTY;
st->accumulator.computed[WHITE] = false;
st->accumulator.computed[BLACK] = false;
auto& dp = st->dirtyPiece;
dp.dirty_num = 1;
@ -1005,8 +1003,8 @@ void Position::do_null_move(StateInfo& newSt) {
st->dirtyPiece.dirty_num = 0;
st->dirtyPiece.piece[0] = NO_PIECE; // Avoid checks in UpdateAccumulator()
st->accumulator.state[WHITE] = Eval::NNUE::EMPTY;
st->accumulator.state[BLACK] = Eval::NNUE::EMPTY;
st->accumulator.computed[WHITE] = false;
st->accumulator.computed[BLACK] = false;
if (st->epSquare != SQ_NONE)
{