Abstract
We consider a class of decomposition methods for variational inequalities, which is related to the classical Dantzig–Wolfe decomposition of linear programs. Our approach is rather general, in that it can be used with certain types of set-valued or nonmonotone operators, as well as with various kinds of approximations in the subproblems of the functions and derivatives in the single-valued case. Also, subproblems may be solved approximately. Convergence is established under reasonable assumptions. We also report numerical experiments for computing variational equilibria of the game-theoretic models of electricity markets. Our numerical results illustrate that the decomposition approach allows to solve large-scale problem instances otherwise intractable if the widely used PATH solver is applied directly, without decomposition.
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We thank the two referees for their constructive comments which helped us to improve the original version.
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The first author is supported by FAPERJ scholarship 100.491/2011. The second author is partially supported by Grants CNPq 303840/2011-0, AFOSR FA9550-08-1-0370, NSF DMS 0707205, as well as by PRONEX-Optimization and FAPERJ. The third author is supported in part by CNPq Grant 302637/2011-7, by PRONEX-Optimization and by FAPERJ. C. Sagastizábal: Visiting researcher at IMPA, on leave from INRIA Rocquencourt, France.
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Luna, J.P., Sagastizábal, C. & Solodov, M. A class of Dantzig–Wolfe type decomposition methods for variational inequality problems. Math. Program. 143, 177–209 (2014). https://doi.org/10.1007/s10107-012-0599-7
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DOI: https://doi.org/10.1007/s10107-012-0599-7
Keywords
- Variational inequality
- Decomposition
- Dantzig–Wolfe decomposition
- Josephy–Newton approximation
- Jacobi approximation
- Variational equilibrium