#include <algorithm>
#include <cassert>
+#include <cmath>
#include <cstdlib>
#include <fstream>
#include <iomanip>
// const unsigned int gEmbeddedNNUESize; // the size of the embedded file
// Note that this does not work in Microsoft Visual Studio.
#if !defined(_MSC_VER) && !defined(NNUE_EMBEDDING_OFF)
- INCBIN(EmbeddedNNUE, EvalFileDefaultName);
+INCBIN(EmbeddedNNUE, EvalFileDefaultName);
#else
- const unsigned char gEmbeddedNNUEData[1] = {0x0};
- const unsigned char *const gEmbeddedNNUEEnd = &gEmbeddedNNUEData[1];
- const unsigned int gEmbeddedNNUESize = 1;
+const unsigned char gEmbeddedNNUEData[1] = {0x0};
+const unsigned char* const gEmbeddedNNUEEnd = &gEmbeddedNNUEData[1];
+const unsigned int gEmbeddedNNUESize = 1;
#endif
namespace Eval {
- std::string currentEvalFileName = "None";
+std::string currentEvalFileName = "None";
- // NNUE::init() tries to load a NNUE network at startup time, or when the engine
- // receives a UCI command "setoption name EvalFile value nn-[a-z0-9]{12}.nnue"
- // The name of the NNUE network is always retrieved from the EvalFile option.
- // We search the given network in three locations: internally (the default
- // network may be embedded in the binary), in the active working directory and
- // in the engine directory. Distro packagers may define the DEFAULT_NNUE_DIRECTORY
- // variable to have the engine search in a special directory in their distro.
-
- void NNUE::init() {
+// Tries to load a NNUE network at startup time, or when the engine
+// receives a UCI command "setoption name EvalFile value nn-[a-z0-9]{12}.nnue"
+// The name of the NNUE network is always retrieved from the EvalFile option.
+// We search the given network in three locations: internally (the default
+// network may be embedded in the binary), in the active working directory and
+// in the engine directory. Distro packagers may define the DEFAULT_NNUE_DIRECTORY
+// variable to have the engine search in a special directory in their distro.
+void NNUE::init() {
std::string eval_file = std::string(Options["EvalFile"]);
if (eval_file.empty())
eval_file = EvalFileDefaultName;
- #if defined(DEFAULT_NNUE_DIRECTORY)
- std::vector<std::string> dirs = { "<internal>" , "" , CommandLine::binaryDirectory , stringify(DEFAULT_NNUE_DIRECTORY) };
- #else
- std::vector<std::string> dirs = { "<internal>" , "" , CommandLine::binaryDirectory };
- #endif
+#if defined(DEFAULT_NNUE_DIRECTORY)
+ std::vector<std::string> dirs = {"<internal>", "", CommandLine::binaryDirectory,
+ stringify(DEFAULT_NNUE_DIRECTORY)};
+#else
+ std::vector<std::string> dirs = {"<internal>", "", CommandLine::binaryDirectory};
+#endif
for (const std::string& directory : dirs)
if (currentEvalFileName != eval_file)
if (directory == "<internal>" && eval_file == EvalFileDefaultName)
{
// C++ way to prepare a buffer for a memory stream
- class MemoryBuffer : public std::basic_streambuf<char> {
- public: MemoryBuffer(char* p, size_t n) { setg(p, p, p + n); setp(p, p + n); }
+ class MemoryBuffer: public std::basic_streambuf<char> {
+ public:
+ MemoryBuffer(char* p, size_t n) {
+ setg(p, p, p + n);
+ setp(p, p + n);
+ }
};
- MemoryBuffer buffer(const_cast<char*>(reinterpret_cast<const char*>(gEmbeddedNNUEData)),
- size_t(gEmbeddedNNUESize));
- (void) gEmbeddedNNUEEnd; // Silence warning on unused variable
+ MemoryBuffer buffer(
+ const_cast<char*>(reinterpret_cast<const char*>(gEmbeddedNNUEData)),
+ size_t(gEmbeddedNNUESize));
+ (void) gEmbeddedNNUEEnd; // Silence warning on unused variable
std::istream stream(&buffer);
if (NNUE::load_eval(eval_file, stream))
currentEvalFileName = eval_file;
}
}
- }
+}
- // NNUE::verify() verifies that the last net used was loaded successfully
- void NNUE::verify() {
+// Verifies that the last net used was loaded successfully
+void NNUE::verify() {
std::string eval_file = std::string(Options["EvalFile"]);
if (eval_file.empty())
if (currentEvalFileName != eval_file)
{
- std::string msg1 = "Network evaluation parameters compatible with the engine must be available.";
+ std::string msg1 =
+ "Network evaluation parameters compatible with the engine must be available.";
std::string msg2 = "The network file " + eval_file + " was not loaded successfully.";
- std::string msg3 = "The UCI option EvalFile might need to specify the full path, including the directory name, to the network file.";
- std::string msg4 = "The default net can be downloaded from: https://tests.stockfishchess.org/api/nn/" + std::string(EvalFileDefaultName);
+ std::string msg3 = "The UCI option EvalFile might need to specify the full path, "
+ "including the directory name, to the network file.";
+ std::string msg4 = "The default net can be downloaded from: "
+ "https://tests.stockfishchess.org/api/nn/"
+ + std::string(EvalFileDefaultName);
std::string msg5 = "The engine will be terminated now.";
sync_cout << "info string ERROR: " << msg1 << sync_endl;
}
sync_cout << "info string NNUE evaluation using " << eval_file << sync_endl;
- }
+}
}
-// simple_eval() returns a static, purely materialistic evaluation of the position
-// from the point of view of the given color. It can be divided by PawnValue to get
+// Returns a static, purely materialistic evaluation of the position from
+// the point of view of the given color. It can be divided by PawnValue to get
// an approximation of the material advantage on the board in terms of pawns.
-
Value Eval::simple_eval(const Position& pos, Color c) {
-
return PawnValue * (pos.count<PAWN>(c) - pos.count<PAWN>(~c))
- + (pos.non_pawn_material(c) - pos.non_pawn_material(~c));
+
return PawnValue * (pos.count<PAWN>(c) - pos.count<PAWN>(~c))
+ + (pos.non_pawn_material(c) - pos.non_pawn_material(~c));
}
-// evaluate() is the evaluator for the outer world. It returns a static evaluation
+// Evaluate is the evaluator for the outer world. It returns a static evaluation
// of the position from the point of view of the side to move.
-
Value Eval::evaluate(const Position& pos) {
- assert(!pos.checkers());
+ assert(!pos.checkers());
- Value v;
- Color stm = pos.side_to_move();
- int shuffling = pos.rule50_count();
- int simpleEval = simple_eval(pos, stm) + (int(pos.key() & 7) - 3);
+ Value v;
+ Color stm = pos.side_to_move();
+ int shuffling = pos.rule50_count();
+ int simpleEval = simple_eval(pos, stm) + (int(pos.key() & 7) - 3);
- bool lazy = abs(simpleEval) >= RookValue + KnightValue
- + 16 * shuffling * shuffling
- + abs(pos.this_thread()->bestValue)
- + abs(pos.this_thread()->rootSimpleEval);
+ bool lazy = std::abs(simpleEval) >= RookValue + KnightValue + 16 * shuffling * shuffling
+ + std::abs(pos.this_thread()->bestValue)
+ + std::abs(pos.this_thread()->rootSimpleEval);
- if (lazy)
- v = Value(simpleEval);
- else
- {
- int nnueComplexity;
- Value nnue = NNUE::evaluate(pos, true, &nnueComplexity);
+ if (lazy)
+ v = Value(simpleEval);
+ else
+ {
+ int nnueComplexity;
+ Value nnue = NNUE::evaluate(pos, true, &nnueComplexity);
- Value optimism = pos.this_thread()->optimism[stm];
+ Value optimism = pos.this_thread()->optimism[stm];
- // Blend optimism and eval with nnue complexity and material imbalance
- optimism += optimism * (nnueComplexity + abs(simpleEval - nnue)) / 512;
- nnue -= nnue * (nnueComplexity + abs(simpleEval - nnue)) / 32768;
+ // Blend optimism and eval with nnue complexity and material imbalance
+ optimism += optimism * (nnueComplexity + std::abs(simpleEval - nnue)) / 512;
+ nnue -= nnue * (nnueComplexity + std::abs(simpleEval - nnue)) / 32768;
- int npm = pos.non_pawn_material() / 64;
- v = ( nnue * (915 + npm + 9 * pos.count<PAWN>())
- + optimism * (154 + npm )) / 1024;
- }
+ int npm = pos.non_pawn_material() / 64;
+ v = (nnue * (915 + npm + 9 * pos.count<PAWN>()) + optimism * (154 + npm)) / 1024;
+ }
- // Damp down the evaluation linearly when shuffling
- v = v * (200 - shuffling) / 214;
+ // Damp down the evaluation linearly when shuffling
+ v = v * (200 - shuffling) / 214;
- // Guarantee evaluation does not hit the tablebase range
- v = std::clamp(v, VALUE_TB_LOSS_IN_MAX_PLY + 1, VALUE_TB_WIN_IN_MAX_PLY - 1);
+ // Guarantee evaluation does not hit the tablebase range
+ v = std::clamp(v, VALUE_TB_LOSS_IN_MAX_PLY + 1, VALUE_TB_WIN_IN_MAX_PLY - 1);
- return v;
+ return v;
}
-// trace() is like evaluate(), but instead of returning a value, it returns
+// Like evaluate(), but instead of returning a value, it returns
// a string (suitable for outputting to stdout) that contains the detailed
// descriptions and values of each evaluation term. Useful for debugging.
// Trace scores are from white's point of view
-
std::string Eval::trace(Position& pos) {
- if (pos.checkers())
- return "Final evaluation: none (in check)";
+ if (pos.checkers())
+ return "Final evaluation: none (in check)";
- // Reset any global variable used in eval
- pos.this_thread()->bestValue = VALUE_ZERO;
- pos.this_thread()->rootSimpleEval = VALUE_ZERO;
- pos.this_thread()->optimism[WHITE] = VALUE_ZERO;
- pos.this_thread()->optimism[BLACK] = VALUE_ZERO;
+ // Reset any global variable used in eval
+ pos.this_thread()->bestValue = VALUE_ZERO;
+ pos.this_thread()->rootSimpleEval = VALUE_ZERO;
+ pos.this_thread()->optimism[WHITE] = VALUE_ZERO;
+ pos.this_thread()->optimism[BLACK] = VALUE_ZERO;
- std::stringstream ss;
- ss << std::showpoint << std::noshowpos << std::fixed << std::setprecision(2);
- ss << '\n' << NNUE::trace(pos) << '\n';
+ std::stringstream ss;
+ ss << std::showpoint << std::noshowpos << std::fixed << std::setprecision(2);
+ ss << '\n' << NNUE::trace(pos) << '\n';
- ss << std::showpoint << std::showpos << std::fixed << std::setprecision(2) << std::setw(15);
+ ss << std::showpoint << std::showpos << std::fixed << std::setprecision(2) << std::setw(15);
- Value v;
- v = NNUE::evaluate(pos, false);
- v = pos.side_to_move() == WHITE ? v : -v;
- ss << "NNUE evaluation " << 0.01 * UCI::to_cp(v) << " (white side)\n";
+ Value v;
+ v = NNUE::evaluate(pos, false);
+ v = pos.side_to_move() == WHITE ? v : -v;
+ ss << "NNUE evaluation " << 0.01 * UCI::to_cp(v) << " (white side)\n";
- v = evaluate(pos);
- v = pos.side_to_move() == WHITE ? v : -v;
- ss << "Final evaluation " << 0.01 * UCI::to_cp(v) << " (white side)";
- ss << " [with scaled NNUE, ...]";
- ss << "\n";
+ v = evaluate(pos);
+ v = pos.side_to_move() == WHITE ? v : -v;
+ ss << "Final evaluation " << 0.01 * UCI::to_cp(v) << " (white side)";
+ ss << " [with scaled NNUE, ...]";
+ ss << "\n";
- return ss.str();
+ return ss.str();
}
-} // namespace Stockfish
+} // namespace Stockfish
projects / stockfish / blobdiff