We analyze the properties of an interior point cutting plane algorithm that is based on a semi-infinite linear formulation of the dual semidefinite program. The cutting plane algorithm approximately solves a linear relaxation of the dual semidefinite program in every iteration and relies on a separation oracle that returns linear cutting planes. We show that the complexity of a variant of the interior point cutting plane algorithm is slightly smaller than that of a direct interior point solver for semidefinite programs where the number of constraints is approximately equal to the dimension of the matrix. Our primary focus in this paper is the design of good separation oracles that return cutting planes that support the feasible region of the dual semidefinite program. Furthermore, we introduce a concept called the tangent space induced by a supporting hyperplane that measures the strength of a cutting plane, characterize the supporting hyperplanes that give higher dimensional tangent spaces, and show how such cutting planes can be found efficiently. Our procedures are analogous to finding facets of an integer polytope in cutting plane methods for integer programming. We illustrate these concepts with two examples in the paper. We present computational results that highlight the strength of these cutting planes in a practical setting. Our technique of finding higher dimensional cutting planes can conceivably be used to improve the convergence of the spectral bundle method of Helmberg et al. (2000, 2003), and the non-polyhedral cutting surface algorithms of Sivaramakrishnan et al. (2005) and Oskoorouchi et al. (2007, 2009).
Citation
Technical Report, Department of Mathematical Sciences, Rensselaer Polytechnic Institute, July 2012; to appear in Pacific Journal of Optimization - special issue on "conic optimization". Also available at http://www.rpi.edu/~mitchj/papers/properties.html
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