X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fnnue%2Ffeatures%2Fhalf_kp.cpp;h=aa1deceece2eab33b511a5749b0821e84984dd9e;hp=5c7538de4a168f395c29c2657ce354f7d403eaa6;hb=HEAD;hpb=fbbd4adc3c01460faa3cc8f91771ab9b0ef718ca

diff --git a/src/nnue/features/half_kp.cpp b/src/nnue/features/half_kp.cpp
deleted file mode 100644
index 5c7538de..00000000
--- a/src/nnue/features/half_kp.cpp
+++ /dev/null
@@ -1,87 +0,0 @@
-/*
-  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
-  Copyright (C) 2004-2021 The Stockfish developers (see AUTHORS file)
-
-  Stockfish is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  Stockfish is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-//Definition of input features HalfKP of NNUE evaluation function
-
-#include "half_kp.h"
-#include "index_list.h"
-
-namespace Stockfish::Eval::NNUE::Features {
-
-  // Orient a square according to perspective (rotates by 180 for black)
-  inline Square orient(Color perspective, Square s) {
-    return Square(int(s) ^ (bool(perspective) * 63));
-  }
-
-  // Index of a feature for a given king position and another piece on some square
-  inline IndexType make_index(Color perspective, Square s, Piece pc, Square ksq) {
-    return IndexType(orient(perspective, s) + PieceSquareIndex[perspective][pc] + PS_NB * ksq);
-  }
-
-  // Get a list of indices for active features
-  template <Side AssociatedKing>
-  void HalfKP<AssociatedKing>::append_active_indices(
-      const Position& pos, Color perspective, IndexList* active) {
-
-    Square ksq = orient(perspective, pos.square<KING>(perspective));
-    Bitboard bb = pos.pieces() & ~pos.pieces(KING);
-    while (bb)
-    {
-      Square s = pop_lsb(bb);
-      active->push_back(make_index(perspective, s, pos.piece_on(s), ksq));
-    }
-  }
-
-
-  // append_changed_indices() : get a list of indices for recently changed features
-
-  // IMPORTANT: The `pos` in this function is pretty much useless as it
-  // is not always the position the features are updated to. The feature
-  // transformer code right now can update multiple accumulators per move,
-  // but since Stockfish only keeps the full state of the current leaf
-  // search position it is not possible to always pass here the position for
-  // which the accumulator is being updated. Therefore the only thing that
-  // can be reliably extracted from `pos` is the king square for the king
-  // of the `perspective` color (note: not even the other king's square will
-  // match reality in all cases, this is also the reason why `dp` is passed
-  // as a parameter and not extracted from pos.state()). This is of particular
-  // problem for future nets with other feature sets, where updating the active
-  // feature might require more information from the intermediate positions. In
-  // this case the only easy solution is to remove the multiple updates from
-  // the feature transformer update code and only update the accumulator for
-  // the current leaf position (the position after the move).
-
-  template <Side AssociatedKing>
-  void HalfKP<AssociatedKing>::append_changed_indices(
-      const Position& pos, const DirtyPiece& dp, Color perspective,
-      IndexList* removed, IndexList* added) {
-
-    Square ksq = orient(perspective, pos.square<KING>(perspective));
-    for (int i = 0; i < dp.dirty_num; ++i) {
-      Piece pc = dp.piece[i];
-      if (type_of(pc) == KING) continue;
-      if (dp.from[i] != SQ_NONE)
-        removed->push_back(make_index(perspective, dp.from[i], pc, ksq));
-      if (dp.to[i] != SQ_NONE)
-        added->push_back(make_index(perspective, dp.to[i], pc, ksq));
-    }
-  }
-
-  template class HalfKP<Side::Friend>;
-
-}  // namespace Stockfish::Eval::NNUE::Features