Multiuser Optimization: Distributed Algorithms and Error Analysis

Traditionally, a multiuser problem is a constrained optimization problem characterized by a set of users, an objective given by a sum of user-specific utility functions, and a collection of linear constraints that couple the user decisions. The users do not share the information about their utilitie...

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Veröffentlicht in:SIAM journal on optimization Jg. 21; H. 3; S. 1046 - 1081
Hauptverfasser: Koshal, Jayash, Nedić, Angelia, Shanbhag, Uday V.
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Philadelphia Society for Industrial and Applied Mathematics 01.07.2011
Schlagworte:
Algorithms
Approximation
Error analysis
Optimization
Utility functions
ISSN:1052-6234, 1095-7189
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Abstract Traditionally, a multiuser problem is a constrained optimization problem characterized by a set of users, an objective given by a sum of user-specific utility functions, and a collection of linear constraints that couple the user decisions. The users do not share the information about their utilities, but do communicate values of their decision variables. The multiuser problem is to maximize the sum of the user-specific utility functions subject to the coupling constraints, while abiding by the informational requirements of each user. In this paper, we focus on generalizations of convex multiuser optimization problems where the objective and constraints are not separable by user and instead consider instances where user decisions are coupled, both in the objective and through nonlinear coupling constraints. To solve this problem, we consider the application of gradient-based distributed algorithms on an approximation of the multiuser problem. Such an approximation is obtained through a Tikhonov regularization and is equipped with estimates of the difference between the optimal function values of the original problem and its regularized counterpart. In the algorithmic development, we consider constant step-length primal-dual and dual schemes in which the iterate computations are distributed naturally across the users; i.e., each user updates its own decision only. Convergence in the primal-dual space is provided in limited coordination settings, which allows for differing step lengths across users as well as across the primal and dual space. We observe that a generalization of this result is also available when users choose their regularization parameters independently from a prescribed range. An alternative to primal-dual schemes can be found in dual schemes that are analyzed in regimes where approximate primal solutions are obtained through a fixed number of gradient steps. Per-iteration error bounds are provided in such regimes, and extensions are provided to regimes where users independently choose their regularization parameters. Our results are supported by a case study in which the proposed algorithms are applied to a multiuser problem arising in a congested traffic network. [PUBLICATION ABSTRACT]
AbstractList Traditionally, a multiuser problem is a constrained optimization problem characterized by a set of users, an objective given by a sum of user-specific utility functions, and a collection of linear constraints that couple the user decisions. The users do not share the information about their utilities, but do communicate values of their decision variables. The multiuser problem is to maximize the sum of the user-specific utility functions subject to the coupling constraints, while abiding by the informational requirements of each user. In this paper, we focus on generalizations of convex multiuser optimization problems where the objective and constraints are not separable by user and instead consider instances where user decisions are coupled, both in the objective and through nonlinear coupling constraints. To solve this problem, we consider the application of gradient-based distributed algorithms on an approximation of the multiuser problem. Such an approximation is obtained through a Tikhonov regularization and is equipped with estimates of the difference between the optimal function values of the original problem and its regularized counterpart. In the algorithmic development, we consider constant step-length primal-dual and dual schemes in which the iterate computations are distributed naturally across the users; i.e., each user updates its own decision only. Convergence in the primal-dual space is provided in limited coordination settings, which allows for differing step lengths across users as well as across the primal and dual space. We observe that a generalization of this result is also available when users choose their regularization parameters independently from a prescribed range. An alternative to primal-dual schemes can be found in dual schemes that are analyzed in regimes where approximate primal solutions are obtained through a fixed number of gradient steps. Per-iteration error bounds are provided in such regimes, and extensions are provided to regimes where users independently choose their regularization parameters. Our results are supported by a case study in which the proposed algorithms are applied to a multiuser problem arising in a congested traffic network. [PUBLICATION ABSTRACT]
Author Shanbhag, Uday V.
Nedić, Angelia
Koshal, Jayash
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  surname: Shanbhag
  fullname: Shanbhag, Uday V.
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Cites_doi 10.1007/s10107-004-0552-5
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SubjectTerms Algorithms
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Optimization
Utility functions
Title Multiuser Optimization: Distributed Algorithms and Error Analysis
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