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Information Relaxations, Duality, and Convex Dynamic Programs

David Brown (dbbrown***at***duke.edu)
James Smith (jes9***at***duke.edu)

Abstract: We consider the information relaxation approach for calculating performance bounds for stochastic dynamic programs (DPs), following Brown, Smith, and Sun (2010). This approach generates performance bounds by solving problems with relaxed nonanticipativity constraints and a penalty that punishes violations of these nonanticipativity constraints. In this paper, we study DPs that have a convex structure and consider gradient penalties that are based on first-order linear approximations of approximate value functions. When used with perfect information relaxations, these penalties lead to subproblems that are deterministic convex optimization problems. We show that these gradient penalties can, in theory, provide tight bounds for convex DPs and can be used to improve on bounds provided by other relaxations, such as Lagrangian relaxation bounds. Finally, we apply these results in two example applications: first, a network revenue management problem that describes an airline trying to manage seat capacity on its flights; and second, an inventory management problem with lead times and lost sales. These are challenging problems of significant practical interest. In both examples, we compute performance bounds using information relaxations with gradient penalties and find that some relatively easy-to-compute heuristic policies are nearly optimal.

Keywords: Dynamic Programming, Information Relaxations, Network Revenue Management, Lost Sales Inventory Models

Category 1: Other Topics (Dynamic Programming )

Category 2: Applications -- OR and Management Sciences

Category 3: Convex and Nonsmooth Optimization

Citation: To appear, Operations Research, 2014.

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Entry Submitted: 10/15/2013
Entry Accepted: 10/15/2013
Entry Last Modified: 09/15/2014

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