The Shared Graph Structure of MCTS and GNNs
its_vayishu · x · 2026-07-19
The author shares an intuition: both MCTS and GNNs essentially deal with "information propagation on graphs," just in opposite directions.
- MCTS searches through a state graph and propagates values back up the tree to determine the optimal path.
- GNNs pass messages between neighboring nodes, allowing each node to learn from its surrounding structure.
To illustrate this, the author created a quick demo: generating random graphs and running side-by-side animations of search backpropagation versus message passing, making their shared underlying structure much easier to grasp.
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