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Monte Carlo Tree Search (MCTS)

Monte Carlo Tree Search is a strategy for exploring solution space systematically.

Overview

MCTS uses:

  • Tree Structure: Represents problem states
  • Exploration: UCB-based node selection
  • Simulation: Random playouts from nodes
  • Backpropagation: Update statistics

When to Use MCTS

  • Complex multi-step problems
  • Game-like reasoning tasks
  • Dialogue systems
  • Exploration-exploitation tradeoff needed

Configuration

Rust
pub struct MCTSConfig {
    pub num_iterations: usize,
    pub exploration_constant: f32,  // UCB parameter
    pub max_depth: usize,
    pub simulation_rollouts: usize,
}

Example

Rust
let config = MCTSConfig::default();
let mcts = MCTS::new(config);

let result = mcts.optimize(query, client).await?;

Implementation Details

See MOA and Best-of-N for complementary strategies.