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nodchip
66 lines
2.5 KiB
C++
66 lines
2.5 KiB
C++
//Definition of input features HalfRelativeKP of NNUE evaluation function
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#ifndef _NNUE_FEATURES_HALF_RELATIVE_KP_H_
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#define _NNUE_FEATURES_HALF_RELATIVE_KP_H_
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#if defined(EVAL_NNUE)
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#include "../../evaluate.h"
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#include "features_common.h"
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namespace Eval {
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namespace NNUE {
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namespace Features {
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// Feature HalfRelativeKP: Relative position of each piece other than the ball based on own ball or enemy ball
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template <Side AssociatedKing>
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class HalfRelativeKP {
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public:
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// feature quantity name
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static constexpr const char* kName = (AssociatedKing == Side::kFriend) ?
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"HalfRelativeKP(Friend)" : "HalfRelativeKP(Enemy)";
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// Hash value embedded in the evaluation function file
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static constexpr std::uint32_t kHashValue =
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0xF9180919u ^ (AssociatedKing == Side::kFriend);
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// Piece type excluding balls
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static constexpr IndexType kNumPieceKinds = 5 * 2;
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// width of the virtual board with the ball in the center
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static constexpr IndexType kBoardWidth = FILE_NB * 2 - 1;
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// height of a virtual board with balls in the center
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static constexpr IndexType kBoardHeight = RANK_NB * 2 - 1;
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// number of feature dimensions
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static constexpr IndexType kDimensions =
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kNumPieceKinds * kBoardHeight * kBoardWidth;
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// The maximum value of the number of indexes whose value is 1 at the same time among the feature values
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static constexpr IndexType kMaxActiveDimensions = 30; // Kings don't count
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// Timing of full calculation instead of difference calculation
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static constexpr TriggerEvent kRefreshTrigger =
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(AssociatedKing == Side::kFriend) ?
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TriggerEvent::kFriendKingMoved : TriggerEvent::kEnemyKingMoved;
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// Get a list of indices with a value of 1 among the features
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static void AppendActiveIndices(const Position& pos, Color perspective,
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IndexList* active);
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// Get a list of indices whose values have changed from the previous one in the feature quantity
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static void AppendChangedIndices(const Position& pos, Color perspective,
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IndexList* removed, IndexList* added);
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// Find the index of the feature quantity from the ball position and PieceSquare
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static IndexType MakeIndex(Square s, IndexType p);
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// Find the index of the feature quantity from the ball position and PieceSquare
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static IndexType MakeIndex(Color perspective, Square s, Piece pc, Square sq_k);
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};
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} // namespace Features
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} // namespace NNUE
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} // namespace Eval
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#endif // defined(EVAL_NNUE)
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#endif
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