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Google DeepMind Introduces Mind Evolution: Enhancing Natural Language Planning with Evolutionary Search in Large Language Models

Google DeepMind Introduces Mind Evolution: Enhancing Natural Language Planning with Evolutionary Search in Large Language Models

Enhancing Problem-Solving with LLMs

Large Language Models (LLMs) can significantly improve their problem-solving skills by thinking critically and using inference-time computation effectively. Various strategies have been researched, such as:

  • Chain-of-thought reasoning
  • Self-consistency
  • Sequential revision with feedback
  • Search methods with auxiliary evaluators

Search-based methods, especially when combined with solution evaluators, can explore more potential solutions, increasing the chances of finding successful outcomes.

Evolutionary Search for Optimization

Recent advancements have integrated LLMs with evolutionary search techniques for optimization tasks. This allows solutions to evolve directly in natural language, eliminating the need for complex formalizations. Key applications include:

  • Prompt optimization
  • Multi-agent system design (e.g., EvoAgent)

While some methods like Gemini 1.5 Flash have shown better success in benchmarks, evolutionary search continues to refine solutions effectively through reliable feedback mechanisms.

Introducing Mind Evolution

Researchers from Google DeepMind, UC San Diego, and the University of Alberta have developed Mind Evolution, a new evolutionary search strategy that enhances LLM performance during inference. Key features include:

  • Iterative generation and refinement of solutions in natural language
  • A solution evaluator to improve success rates in planning tasks

Mind Evolution has achieved impressive results, such as a 95.6% success rate on the TravelPlanner benchmark and has introduced new challenges like StegPoet.

Genetic Search Approach

This method utilizes language-based genetic algorithms, allowing LLMs to perform critical operations like crossover and mutation. The process involves:

  • Generating initial solutions with LLM prompts
  • Refining solutions through a “Refinement through Critical Conversation” (RCC) process
  • Employing techniques like Boltzmann tournament selection to maintain diversity

Performance and Conclusion

Mind Evolution has been tested on various natural language planning benchmarks, achieving over 95% success in TravelPlanner and Trip Planning, and 85% in Meeting Planning. Its efficiency is highlighted by metrics on success rates and costs.

In summary, Mind Evolution offers a powerful evolutionary search strategy that enhances LLM capabilities in complex tasks without relying on formal solvers. Its impressive success rates demonstrate its effectiveness and adaptability in various domains.

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