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8e5392d79a
This commit introduces Full Threat Input features, which are a subset of Piece(Square)-Piece(Square) pairs. In any given position, the active features consist of pairs where the second piece’s square lies in the attack set of the first piece. This is an extremely simplified explanation that leaves out many details. The already-used HalfKAv2_hm feature set completes the input features. Minor quantization changes have also been made. The net nn-49c1193b131c.nnue was trained by vondele using the following setup: https://github.com/vondele/nettest/blob/7de71238e9b295e3f88ed7c9c5936af632c9b981/threats.yaml A graphical version of an earlier scheme (with less refinement) that illustrates the core concepts can be found attached. [NewInputs.pdf](https://github.com/user-attachments/files/23478441/NewInputs.pdf) Further information, as well as a brief description of the history of development, can be found attached. [Stockfish threat inputs PR summary.pdf](https://github.com/user-attachments/files/23478634/Stockfish.threat.inputs.PR.summary.pdf) This has been a huge effort spanning over half a year, with the original [discussion thread](https://discord.com/channels/435943710472011776/1336647760388034610) reaching over 11k messages. Thanks to everyone who has contributed. Monty PRs: https://github.com/official-monty/Monty/pull/87 (Initial threat input PR) https://github.com/official-monty/Monty/pull/114 (Fixed threat indexing to take into account colour correctly) https://github.com/official-monty/Monty/pull/116 (i8 quantisation of weights whilst keeping calculations in i16) Yukari commit: https://github.com/yukarichess/yukari/commit/2d482c64a79cec03cf4987d5289334b9cdc737bc (Threat inputs merged) Plentychess PRs: https://github.com/Yoshie2000/PlentyChess/pull/400 (Threat inputs merged) https://github.com/Yoshie2000/PlentyChess/pull/411 (Threat input weights quantised to i8) Passed STC: LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 63424 W: 16956 L: 16591 D: 29877 Ptnml(0-2): 276, 7522, 15797, 7795, 322 https://tests.stockfishchess.org/tests/view/69105b3dec1d00d2c195c569 Passed LTC: LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 27876 W: 7417 L: 7110 D: 13349 Ptnml(0-2): 23, 3033, 7530, 3318, 34 https://tests.stockfishchess.org/tests/view/6910d817ec1d00d2c195c66e Passed VVLTC (Hash accidentally set to 1/2 normal value for both sides): LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 12458 W: 3353 L: 3102 D: 6003 Ptnml(0-2): 0, 1106, 3767, 1355, 1 https://tests.stockfishchess.org/tests/view/69115a26ec1d00d2c195c7cd This version has also passed non-regression LTC against the originally passed version: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 51144 W: 13086 L: 12903 D: 25155 Ptnml(0-2): 22, 5167, 15018, 5336, 29 https://tests.stockfishchess.org/tests/view/69138a317ca87818523314bf LTC elo estimate on ARM: 1 patch : 13.9 1.9 38296.5 73728 52 2 master : 0.0 ---- 35431.5 73728 48 closes https://github.com/official-stockfish/Stockfish/pull/6411 bench: 2626086 Co-authored-by: Shawn Xu <xu107288696@gmail.com> Co-authored-by: Timothy Herchen <timothy.herchen@gmail.com> Co-authored-by: Viren6 <94880762+Viren6@users.noreply.github.com> Co-authored-by: Yoshie2000 <patrick.leonhardt@gmx.net> Co-authored-by: Joost Vandevondele <Joost.VandeVondele@gmail.com> Co-authored-by: rn5f107s2 <clemens.lerchl@gmail.com> Co-authored-by: cj5716 <125858804+cj5716@users.noreply.github.com> Co-authored-by: AliceRoselia <63040919+AliceRoselia@users.noreply.github.com> Co-authored-by: Linmiao Xu <linmiao.xu@gmail.com> Co-authored-by: Disservin <disservin.social@gmail.com>
59 lines
1.9 KiB
C++
59 lines
1.9 KiB
C++
/*
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Stockfish, a UCI chess playing engine derived from Glaurung 2.1
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Copyright (C) 2004-2025 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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#ifndef EVALUATE_H_INCLUDED
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#define EVALUATE_H_INCLUDED
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#include <string>
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#include "types.h"
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namespace Stockfish {
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class Position;
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namespace Eval {
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// The default net name MUST follow the format nn-[SHA256 first 12 digits].nnue
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// for the build process (profile-build and fishtest) to work. Do not change the
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// name of the macro or the location where this macro is defined, as it is used
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// in the Makefile/Fishtest.
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#define EvalFileDefaultNameBig "nn-49c1193b131c.nnue"
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#define EvalFileDefaultNameSmall "nn-37f18f62d772.nnue"
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namespace NNUE {
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struct Networks;
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struct AccumulatorCaches;
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class AccumulatorStack;
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}
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std::string trace(Position& pos, const Eval::NNUE::Networks& networks);
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int simple_eval(const Position& pos);
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bool use_smallnet(const Position& pos);
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Value evaluate(const NNUE::Networks& networks,
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const Position& pos,
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Eval::NNUE::AccumulatorStack& accumulators,
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Eval::NNUE::AccumulatorCaches& caches,
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int optimism);
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} // namespace Eval
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} // namespace Stockfish
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#endif // #ifndef EVALUATE_H_INCLUDED
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