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MITS: Enhanced Tree Search Reasoning for LLMs via Pointwise Mutual Information

arXiv – CS AI|Jiaxi Li, Yucheng Shi, Xiao Huang, Jin Lu, Ninghao Liu||7 views
🤖AI Summary

Researchers introduce MITS (Mutual Information Tree Search), a new framework that improves reasoning capabilities in large language models using information-theoretic principles. The method uses pointwise mutual information for step-wise evaluation and achieves better performance while being more computationally efficient than existing tree search methods like Tree-of-Thought.

Key Takeaways
  • MITS introduces a novel scoring function based on pointwise mutual information for evaluating reasoning steps in LLMs.
  • The framework uses beam search expansion without expensive look-ahead simulations, improving computational efficiency.
  • An entropy-based dynamic sampling strategy adaptively allocates resources to uncertain reasoning steps.
  • MITS consistently outperforms baseline methods across diverse reasoning benchmarks.
  • The framework combines PMI scores with prediction consensus using a weighted voting scheme for final predictions.
Read Original →via arXiv – CS AI
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