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AlphaRouter: Bridging the Gap Between Reinforcement Learning and Optimization for Vehicle Routing with Monte Carlo

Won-Jun Kim1, Junho Jeong2, Taeyeong Kim2

  • 1Hyundai Glovis, Seoul 685-700, Republic of Korea.

Entropy (Basel, Switzerland)
|March 28, 2025
PubMed
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AlphaRouter bridges the gap between deep reinforcement learning (DRL) and optimization heuristics for routing problems. This novel approach combines attention-enabled networks with Monte Carlo Tree Search (MCTS) to achieve superior routing solutions.

Area of Science:

  • Computer Science
  • Operations Research
  • Artificial Intelligence

Background:

  • Deep reinforcement learning (DRL) shows promise for routing problems but differs from traditional optimization heuristics.
  • DRL excels at generalizing across problem instances, while heuristics optimize specific instances.

Purpose of the Study:

  • To propose AlphaRouter, an approach that integrates DRL and optimization for enhanced routing problem-solving.
  • To bridge the gap between computationally driven DRL and established optimization-based heuristics.

Main Methods:

  • Developed attention-enabled policy and value networks for routing.
  • Policy network outputs probability distribution over nodes; value network estimates expected distance.
  • Modified Monte Carlo Tree Search (MCTS) and integrated it with the DRL framework for routing problems.
Keywords:
MCTSdeep reinforcement learningreinforcement learningvehicle routing problem

Related Experiment Videos

Main Results:

  • The combined AlphaRouter approach demonstrates promising performance in solving routing problems.
  • Achieved better solutions compared to DRL methods without MCTS.
  • Performance is comparable to classical heuristic optimization algorithms.

Conclusions:

  • AlphaRouter effectively integrates DRL and MCTS to enhance routing problem-solving.
  • The proposed method offers a competitive alternative to existing DRL and heuristic approaches.
  • This work advances the application of AI in complex optimization tasks like routing.