mirror of
https://github.com/official-stockfish/Stockfish.git
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sscg13andJoost VandeVondele
fac506bdf3
Removes threat features of the form piece -> king, thus saving 13MB of net space and approximately 0.8 threat feature updates per incremental accumulator update. Passed non-regression STC: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 33664 W: 8864 L: 8636 D: 16164 Ptnml(0-2): 136, 3926, 8501, 4112, 157 https://tests.stockfishchess.org/tests/view/6981dcda4776a4e6e7fef2ac Passed non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 46896 W: 12077 L: 11881 D: 22938 Ptnml(0-2): 41, 5118, 12924, 5334, 31 https://tests.stockfishchess.org/tests/view/69827c6beb87369ff4d0c7d5 closes https://github.com/official-stockfish/Stockfish/pull/6593 bench: 2668754
105 lines
4.0 KiB
C++
105 lines
4.0 KiB
C++
/*
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Stockfish, a UCI chess playing engine derived from Glaurung 2.1
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Copyright (C) 2004-2026 The Stockfish developers (see AUTHORS file)
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Stockfish is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Stockfish is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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//Definition of input features Simplified_Threats of NNUE evaluation function
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#ifndef NNUE_FEATURES_FULL_THREATS_INCLUDED
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#define NNUE_FEATURES_FULL_THREATS_INCLUDED
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#include <cstdint>
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#include "../../misc.h"
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#include "../../types.h"
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#include "../nnue_common.h"
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namespace Stockfish {
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class Position;
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}
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namespace Stockfish::Eval::NNUE::Features {
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static constexpr int numValidTargets[PIECE_NB] = {0, 6, 10, 8, 8, 10, 8, 0,
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0, 6, 10, 8, 8, 10, 8, 0};
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class FullThreats {
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public:
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// Feature name
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static constexpr const char* Name = "Full_Threats(Friend)";
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// Hash value embedded in the evaluation file
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static constexpr std::uint32_t HashValue = 0x8f234cb8u;
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// Number of feature dimensions
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static constexpr IndexType Dimensions = 66864;
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// clang-format off
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// Orient a square according to perspective (rotates by 180 for black)
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static constexpr std::int8_t OrientTBL[SQUARE_NB] = {
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SQ_A1, SQ_A1, SQ_A1, SQ_A1, SQ_H1, SQ_H1, SQ_H1, SQ_H1,
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SQ_A1, SQ_A1, SQ_A1, SQ_A1, SQ_H1, SQ_H1, SQ_H1, SQ_H1,
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SQ_A1, SQ_A1, SQ_A1, SQ_A1, SQ_H1, SQ_H1, SQ_H1, SQ_H1,
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SQ_A1, SQ_A1, SQ_A1, SQ_A1, SQ_H1, SQ_H1, SQ_H1, SQ_H1,
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SQ_A1, SQ_A1, SQ_A1, SQ_A1, SQ_H1, SQ_H1, SQ_H1, SQ_H1,
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SQ_A1, SQ_A1, SQ_A1, SQ_A1, SQ_H1, SQ_H1, SQ_H1, SQ_H1,
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SQ_A1, SQ_A1, SQ_A1, SQ_A1, SQ_H1, SQ_H1, SQ_H1, SQ_H1,
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SQ_A1, SQ_A1, SQ_A1, SQ_A1, SQ_H1, SQ_H1, SQ_H1, SQ_H1,
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};
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static constexpr int map[PIECE_TYPE_NB-2][PIECE_TYPE_NB-2] = {
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{0, 1, -1, 2, -1, -1},
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{0, 1, 2, 3, 4, -1},
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{0, 1, 2, 3, -1, -1},
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{0, 1, 2, 3, -1, -1},
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{0, 1, 2, 3, 4, -1},
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{0, 1, 2, 3, -1, -1}
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};
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// clang-format on
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struct FusedUpdateData {
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Bitboard dp2removedOriginBoard = 0;
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Bitboard dp2removedTargetBoard = 0;
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Square dp2removed;
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};
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// Maximum number of simultaneously active features.
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static constexpr IndexType MaxActiveDimensions = 128;
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using IndexList = ValueList<IndexType, MaxActiveDimensions>;
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using DiffType = DirtyThreats;
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static IndexType
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make_index(Color perspective, Piece attkr, Square from, Square to, Piece attkd, Square ksq);
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// Get a list of indices for active features
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static void append_active_indices(Color perspective, const Position& pos, IndexList& active);
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// Get a list of indices for recently changed features
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static void append_changed_indices(Color perspective,
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Square ksq,
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const DiffType& diff,
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IndexList& removed,
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IndexList& added,
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FusedUpdateData* fd = nullptr,
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bool first = false);
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// Returns whether the change stored in this DirtyPiece means
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// that a full accumulator refresh is required.
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static bool requires_refresh(const DiffType& diff, Color perspective);
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};
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} // namespace Stockfish::Eval::NNUE::Features
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#endif // #ifndef NNUE_FEATURES_FULL_THREATS_INCLUDED
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