2 Stockfish, a UCI chess playing engine derived from Glaurung 2.1
3 Copyright (C) 2004-2020 The Stockfish developers (see AUTHORS file)
5 Stockfish is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation, either version 3 of the License, or
8 (at your option) any later version.
10 Stockfish is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
19 // Definition of input features and network structure used in NNUE evaluation function
21 #ifndef NNUE_HALFKP_256X2_32_32_H_INCLUDED
22 #define NNUE_HALFKP_256X2_32_32_H_INCLUDED
24 #include "../features/feature_set.h"
25 #include "../features/half_kp.h"
27 #include "../layers/input_slice.h"
28 #include "../layers/affine_transform.h"
29 #include "../layers/clipped_relu.h"
31 namespace Eval::NNUE {
33 // Input features used in evaluation function
34 using RawFeatures = Features::FeatureSet<
35 Features::HalfKP<Features::Side::kFriend>>;
37 // Number of input feature dimensions after conversion
38 constexpr IndexType kTransformedFeatureDimensions = 256;
42 // Define network structure
43 using InputLayer = InputSlice<kTransformedFeatureDimensions * 2>;
44 using HiddenLayer1 = ClippedReLU<AffineTransform<InputLayer, 32>>;
45 using HiddenLayer2 = ClippedReLU<AffineTransform<HiddenLayer1, 32>>;
46 using OutputLayer = AffineTransform<HiddenLayer2, 1>;
50 using Network = Layers::OutputLayer;
52 } // namespace Eval::NNUE
54 #endif // #ifndef NNUE_HALFKP_256X2_32_32_H_INCLUDED