no code implementations • 11 Feb 2024 • Ziang Chen, Jialin Liu, Xiaohan Chen, Xinshang Wang, Wotao Yin
Graph neural networks (GNNs) have been widely used to predict properties and heuristics of mixed-integer linear programs (MILPs) and hence accelerate MILP solvers.
1 code implementation • 20 Oct 2023 • Haoyu Wang, Jialin Liu, Xiaohan Chen, Xinshang Wang, Pan Li, Wotao Yin
Mixed-integer linear programming (MILP) stands as a notable NP-hard problem pivotal to numerous crucial industrial applications.
1 code implementation • 19 Oct 2022 • Ziang Chen, Jialin Liu, Xinshang Wang, Jianfeng Lu, Wotao Yin
While Mixed-integer linear programming (MILP) is NP-hard in general, practical MILP has received roughly 100--fold speedup in the past twenty years.
1 code implementation • 25 Sep 2022 • Ziang Chen, Jialin Liu, Xinshang Wang, Jianfeng Lu, Wotao Yin
In particular, the graph neural network (GNN) is considered a suitable ML model for optimization problems whose variables and constraints are permutation--invariant, for example, the linear program (LP).
no code implementations • 19 Mar 2019 • Rong Jin, David Simchi-Levi, Li Wang, Xinshang Wang, Sen Yang
In this paper, we study algorithms for dynamically identifying a large number of products (i. e., SKUs) with top customer purchase probabilities on the fly, from an ocean of potential products to offer on retailers' ultra-fast delivery platforms.
no code implementations • NeurIPS 2018 • Zeyuan Allen-Zhu, David Simchi-Levi, Xinshang Wang
Classically, the time complexity of a first-order method is estimated by its number of gradient computations.
no code implementations • NeurIPS 2018 • Zeyuan Allen-Zhu, David Simchi-Levi, Xinshang Wang
Classically, the time complexity of a first-order method is estimated by its number of gradient computations.
no code implementations • 11 Oct 2018 • Wang Chi Cheung, Will Ma, David Simchi-Levi, Xinshang Wang
We overcome both the challenges of model uncertainty and customer heterogeneity by judiciously synthesizing two algorithmic frameworks from the literature: inventory balancing, which "reserves" a portion of each resource for high-reward customer types which could later arrive, and online learning, which shows how to "explore" the resource consumption distributions of each customer type under different actions.