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68 lines
2.4 KiB
C++
68 lines
2.4 KiB
C++
/*
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* Copyright (c) 2020, the SerenityOS developers.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/Function.h>
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#include <AK/NonnullOwnPtrVector.h>
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#include <LibChess/Chess.h>
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#include <math.h>
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class MCTSTree {
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public:
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enum EvalMethod {
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Simulation,
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Heuristic,
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};
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MCTSTree(const Chess::Board& board, double exploration_parameter = sqrt(2), MCTSTree* parent = nullptr);
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MCTSTree& select_leaf();
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MCTSTree& expand();
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int simulate_game() const;
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int heuristic() const;
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void apply_result(int game_score);
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void do_round();
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Chess::Move best_move() const;
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double expected_value() const;
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double uct(Chess::Color color) const;
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bool expanded() const;
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EvalMethod eval_method() const { return m_eval_method; }
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void set_eval_method(EvalMethod method) { m_eval_method = method; }
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private:
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NonnullOwnPtrVector<MCTSTree> m_children;
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MCTSTree* m_parent { nullptr };
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int m_white_points { 0 };
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int m_simulations { 0 };
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bool m_moves_generated { false };
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double m_exploration_parameter;
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EvalMethod m_eval_method { EvalMethod::Simulation };
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Chess::Board m_board;
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};
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