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Deep Controlled Learning for Inventory Control

Problem Definition: Are traditional deep reinforcement learning (DRL) algorithms, developed for a broad range of purposes including game-play and robotics, the most suitable machine learning algorithms for applications in inventory control? To what extent would DRL algorithms tailored to the unique characteristics of inventory control problems provide superior performance compared to DRL and traditional benchmarks? Methodology/results: We propose and study Deep Controlled Learning (DCL), a new DRL framework based on approximate policy iteration specifically designed to tackle inventory problems. Comparative evaluations reveal that DCL outperforms existing state-of-the-art heuristics in lost sales inventory control, perishable inventory systems, and inventory systems with random lead times, achieving lower average costs across all test instances and maintaining an optimality gap of no more than 0.1\%. Notably, the same hyperparameter set is utilized across all experiments, underscoring the robustness and generalizability of the proposed method. Managerial implications: These substantial performance and robustness improvements pave the way for the effective application of tailored DRL algorithms to inventory management problems, empowering decision-makers to optimize stock levels, minimize costs, and enhance responsiveness across various industries.

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