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A graph-based decomposition method for convex quadratic optimization with indicators

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Abstract

In this paper, we consider convex quadratic optimization problems with indicator variables when the matrix Q defining the quadratic term in the objective is sparse. We use a graphical representation of the support of Q, and show that if this graph is a path, then we can solve the associated problem in polynomial time. This enables us to construct a compact extended formulation for the closure of the convex hull of the epigraph of the mixed-integer convex problem. Furthermore, motivated by inference problems with graphical models, we propose a novel decomposition method for a class of general (sparse) strictly diagonally dominant Q, which leverages the efficient algorithm for the path case. Our computational experiments demonstrate the effectiveness of the proposed method compared to state-of-the-art mixed-integer optimization solvers.

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Notes

  1. They consider a slightly different term, where the sparsity is imposed via a cardinality constraint \(a^\top z\le k\) instead of a penalization in the objective.

  2. For step size \(s_k=1/k\), we modify line 6 of Algorithm 2 to \((\alpha ,\beta )\leftarrow (\alpha ,\beta )+s_k \rho (\bar{x},\bar{z})\) (without normalization), since this version performed better in our computations.

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Acknowledgements

We thank the AE and the referees whose comments improved this paper.

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Authors and Affiliations

  1. Daniel J. Epstein Department of Industrial and Systems Engineering, University of Southern California, Los Angeles, CA, USA

    Peijing Liu & Andrés Gómez

  2. Industrial and Operations Engineering, University of Michigan, Ann Arbor, MI, USA

    Salar Fattahi

  3. Department of Industrial Engineering and Management Sciences, Northwestern University, Evanston, IL, USA

    Simge Küçükyavuz

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  1. Peijing Liu
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  2. Salar Fattahi
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  4. Simge Küçükyavuz
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Correspondence to Simge Küçükyavuz.

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This research is supported, in part, by NSF grants 2006762, 2007814, 2152776, and ONR grant N00014-22-1-2127.

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Liu, P., Fattahi, S., Gómez, A. et al. A graph-based decomposition method for convex quadratic optimization with indicators. Math. Program. 200, 669–701 (2023). https://doi.org/10.1007/s10107-022-01845-0

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