mirror of
https://github.com/opelly27/Stockfish.git
synced 2026-05-20 03:57:45 +00:00
Sebastian Buchwald
4f4e652eca
closes https://github.com/official-stockfish/Stockfish/pull/4326 also fixes typo, closes https://github.com/official-stockfish/Stockfish/pull/4332 No functional change
121 lines
3.7 KiB
C++
121 lines
3.7 KiB
C++
/*
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Stockfish, a UCI chess playing engine derived from Glaurung 2.1
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Copyright (C) 2004-2023 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 layer ClippedReLU of NNUE evaluation function
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#ifndef NNUE_LAYERS_SQR_CLIPPED_RELU_H_INCLUDED
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#define NNUE_LAYERS_SQR_CLIPPED_RELU_H_INCLUDED
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#include "../nnue_common.h"
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namespace Stockfish::Eval::NNUE::Layers {
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// Clipped ReLU
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template <IndexType InDims>
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class SqrClippedReLU {
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public:
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// Input/output type
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using InputType = std::int32_t;
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using OutputType = std::uint8_t;
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// Number of input/output dimensions
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static constexpr IndexType InputDimensions = InDims;
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static constexpr IndexType OutputDimensions = InputDimensions;
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static constexpr IndexType PaddedOutputDimensions =
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ceil_to_multiple<IndexType>(OutputDimensions, 32);
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using OutputBuffer = OutputType[PaddedOutputDimensions];
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// Hash value embedded in the evaluation file
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static constexpr std::uint32_t get_hash_value(std::uint32_t prevHash) {
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std::uint32_t hashValue = 0x538D24C7u;
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hashValue += prevHash;
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return hashValue;
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}
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// Read network parameters
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bool read_parameters(std::istream&) {
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return true;
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}
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// Write network parameters
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bool write_parameters(std::ostream&) const {
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return true;
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}
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// Forward propagation
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const OutputType* propagate(
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const InputType* input, OutputType* output) const {
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#if defined(USE_SSE2)
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constexpr IndexType NumChunks = InputDimensions / 16;
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#ifdef USE_SSE41
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const __m128i Zero = _mm_setzero_si128();
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#else
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const __m128i k0x80s = _mm_set1_epi8(-128);
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#endif
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static_assert(WeightScaleBits == 6);
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const auto in = reinterpret_cast<const __m128i*>(input);
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const auto out = reinterpret_cast<__m128i*>(output);
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for (IndexType i = 0; i < NumChunks; ++i) {
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__m128i words0 = _mm_packs_epi32(
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_mm_load_si128(&in[i * 4 + 0]),
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_mm_load_si128(&in[i * 4 + 1]));
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__m128i words1 = _mm_packs_epi32(
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_mm_load_si128(&in[i * 4 + 2]),
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_mm_load_si128(&in[i * 4 + 3]));
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// Not sure if
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words0 = _mm_srli_epi16(_mm_mulhi_epi16(words0, words0), 3);
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words1 = _mm_srli_epi16(_mm_mulhi_epi16(words1, words1), 3);
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const __m128i packedbytes = _mm_packs_epi16(words0, words1);
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_mm_store_si128(&out[i],
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#ifdef USE_SSE41
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_mm_max_epi8(packedbytes, Zero)
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#else
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_mm_subs_epi8(_mm_adds_epi8(packedbytes, k0x80s), k0x80s)
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#endif
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);
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}
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constexpr IndexType Start = NumChunks * 16;
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#else
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constexpr IndexType Start = 0;
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#endif
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for (IndexType i = Start; i < InputDimensions; ++i) {
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output[i] = static_cast<OutputType>(
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// really should be /127 but we need to make it fast
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// needs to be accounted for in the trainer
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std::max(0ll, std::min(127ll, (((long long)input[i] * input[i]) >> (2 * WeightScaleBits)) / 128)));
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}
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return output;
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}
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};
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} // namespace Stockfish::Eval::NNUE::Layers
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#endif // NNUE_LAYERS_SQR_CLIPPED_RELU_H_INCLUDED
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