Addressing distributional shifts in operations management: The case of order fulfillment in customized production
This addresses a specific challenge for production managers in manufacturing with high customization, offering a practical solution to improve decision-making under distributional shifts.
The paper tackles the problem of distributional shifts in customized production order fulfillment by proposing an adversarial learning and job shop scheduling approach, which outperforms baselines in empirical validation using real-world data.
To meet order fulfillment targets, manufacturers seek to optimize production schedules. Machine learning can support this objective by predicting throughput times on production lines given order specifications. However, this is challenging when manufacturers produce customized products because customization often leads to changes in the probability distribution of operational data -- so-called distributional shifts. Distributional shifts can harm the performance of predictive models when deployed to future customer orders with new specifications. The literature provides limited advice on how such distributional shifts can be addressed in operations management. Here, we propose a data-driven approach based on adversarial learning and job shop scheduling, which allows us to account for distributional shifts in manufacturing settings with high degrees of product customization. We empirically validate our proposed approach using real-world data from a job shop production that supplies large metal components to an oil platform construction yard. Across an extensive series of numerical experiments, we find that our adversarial learning approach outperforms common baselines. Overall, this paper shows how production managers can improve their decision-making under distributional shifts.