Search Results for author: Xinshang Wang

Found 8 papers, 3 papers with code

Rethinking the Capacity of Graph Neural Networks for Branching Strategy

no code implementations11 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.

DIG-MILP: a Deep Instance Generator for Mixed-Integer Linear Programming with Feasibility Guarantee

1 code implementation20 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.

Data Augmentation

On Representing Mixed-Integer Linear Programs by Graph Neural Networks

1 code implementation19 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.

On Representing Linear Programs by Graph Neural Networks

1 code implementation25 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).

Shrinking the Upper Confidence Bound: A Dynamic Product Selection Problem for Urban Warehouses

no code implementations19 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.

The Lingering of Gradients: Theory and Applications

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.

Management

The Lingering of Gradients: How to Reuse Gradients Over Time

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.

Management

Inventory Balancing with Online Learning

no code implementations11 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.

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