Two-Fidelity Best-Action Identification for Stochastic Minimax Tree

Hugging Face Daily Papers Papers

Summary

The paper proposes 2FFS, a two-fidelity tree-search algorithm that adaptively balances cheap biased evaluations with expensive accurate evaluations in stochastic minimax trees for fixed-confidence best-action identification, with theoretical guarantees and experimental efficiency gains.

We study fixed-confidence best-action identification (BAI) in stochastic minimax trees. This problem is increasingly relevant in modern AI planning, where deep minimax search and Monte Carlo Tree Search (MCTS) with language model long rollouts face a fundamental tradeoff: heuristic evaluations are cheap but biased, while accurate rollouts are reliable but prohibitively expensive. We propose 2FFS, a two-fidelity tree-search algorithm that brings multi-fidelity flat bandit ideas into trees. The algorithm combines minimax-style fast expansion with MCTS-style stochastic sampling, adaptively deciding when to exploit cheap biased evaluations and when to invoke expensive accurate evaluations for local certification. We prove fixed-confidence correctness, establish finite stopping for exact identification, and give a polynomial-depth cost upper bound for general-depth trees. Across numerical stochastic-tree experiments, 2FFS uses substantially fewer samples and computational operations comparing to existing BAI-MCTS baseline.
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Source: https://huggingface.co/papers/2606.01708

Abstract

A two-fidelity tree-search algorithm is proposed that adaptively balances cheap biased evaluations with expensive accurate evaluations in stochastic minimax trees for fixed-confidence best-action identification.

We study fixed-confidencebest-action identification(BAI) instochastic minimax trees. This problem is increasingly relevant in modern AI planning, where deep minimax search andMonte Carlo Tree Search(MCTS) with language model long rollouts face a fundamental tradeoff: heuristic evaluations are cheap but biased, while accurate rollouts are reliable but prohibitively expensive. We propose 2FFS, a two-fidelity tree-search algorithm that bringsmulti-fidelity flat banditideas into trees. The algorithm combines minimax-style fast expansion with MCTS-style stochastic sampling, adaptively deciding when to exploit cheap biased evaluations and when to invoke expensive accurate evaluations for local certification. We provefixed-confidence correctness, establishfinite stoppingfor exact identification, and give apolynomial-depth costupper bound for general-depth trees. Across numerical stochastic-tree experiments, 2FFS uses substantially fewer samples and computational operations comparing to existing BAI-MCTS baseline.

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