6 papers
Log-Driven Semantic Tuning for Mixed Integer Programming Solvers
Zhengzhong Ricky You, Kaizhao Sun, Zeping Min +2
Automated configuration of mixed-integer programming (MIP) solvers largely relies on black-box optimization. Each trial requires an expensive solver run and provides only a scalar…
A Dual-Guided Column-Generation-Based Matheuristic for Integrated Railroad Blocking
Yida Xu, Zhengzhong Ricky You, Baichuan Mo
Integrated railroad blocking is a central planning problem in freight railway operations, which requires coordinated decisions on block design, blocking sequences, and block routin…
PrecPack: An Efficient Open-Source Exact Solver for Bin Packing with Generalized Precedence Constraints
Sunkanghong Wang, Zhengzhong Ricky You, Roberto Baldacci +4
Efficient resource use in packing and assembly-line applications requires decisions that jointly account for capacity and precedence constraints. The strongly NP-hard bin packing p…
TorchDCM: A Unified PyTorch-Native Package for Discrete Choice Modeling
Baichuan Mo, Zhengzhong Ricky You, Xiqun Michael Chen +1
Estimating large and simulation-intensive discrete choice models (DCMs) requires repeated evaluation of utilities, probabilities, derivatives, and simulated likelihoods over many o…
Learned Pairwise Deep Dual-Optimal Inequalities for Stabilizing Column Generation
Zhengzhong Ricky You, Bo Tang, Haoran Liu +1
Column generation (CG) is central to many large-scale optimization algorithms, including branch-price-and-cut methods for vehicle routing problems, but unstable dual solutions can…
Bulk Service Queueing for Transit Resilience under Short Random Service Suspensions
Baichuan Mo, Li Jin, Zhengzhong Ricky You +3
Short service suspensions are common in public transit systems, but their operational impacts remain difficult to quantify. We develop an analytical framework for measuring the res…