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6f6b1b3ea1
GCC likely has a builtin intrinsic that evaluates the operation at compile-time, even if the `LibM` is not declared as constexpr. Clang, however, does not like it, and it failed to compile this code.
51 lines
1.3 KiB
C++
51 lines
1.3 KiB
C++
/*
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* Copyright (c) 2020, the SerenityOS developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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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 <AK/OwnPtr.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, 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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private:
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// While static parameters are less configurable, they don't take up any
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// memory in the tree, which I believe to be a worthy tradeoff.
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static constexpr double s_exploration_parameter { M_SQRT2 };
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// FIXME: Optimize simulations enough for use.
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static constexpr EvalMethod s_eval_method { EvalMethod::Heuristic };
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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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OwnPtr<Chess::Board> m_board;
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Optional<Chess::Move> m_last_move;
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Chess::Color m_turn : 2;
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bool m_moves_generated : 1 { false };
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};
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