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ChessEngine: Use reduced Board objects in MCTSTree

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Monte-Carlo methods are known to intensively create nodes and in our
case each leaf of the tree stores a board. However, for this use case,
we don't need a full board object that also contains game information.

This patch adds a `clone_cleared()` method that return a clone without
game information and uses it when constructing the tree.
It allows the ChessEngine much more possibility before getting out of
memory.
This commit is contained in:
Lucas CHOLLET 2022-08-14 15:00:52 +02:00 • committed by Andreas Kling
parent 5f13a87ce7
commit 351fc0cce2
3 changed files with 15 additions and 4 deletions
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8
Userland/Services/ChessEngine/MCTSTree.cpp
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@ -39,10 +39,10 @@ MCTSTree& MCTSTree::expand()
VERIFY(!expanded() || m_children.size() == 0);
if (!m_moves_generated) {
m_board->generate_moves([&](Chess::Move move) {
Chess::Board clone = *m_board;
clone.apply_move(move);
m_children.append(make<MCTSTree>(clone, this));
m_board->generate_moves([&](Chess::Move chess_move) {
auto clone = m_board->clone_without_history();
clone.apply_move(chess_move);
m_children.append(make<MCTSTree>(move(clone), this));
return IterationDecision::Continue;
});
m_moves_generated = true;