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• W2962746230 abstract "Many machine learning problems can be reduced to learning a low-rank positive semidefinite matrix (denoted as Z ), which encounters semidefinite program (SDP). Existing SDP solvers are often expensive for large-scale learning. In order to avoid directly solving SDP, some works convert SDP into a nonconvex program by factorizing Z as XX ⊤ . However, this would bring higher-order nonlinearity, resulting in scarcity of structure in subsequent optimization. In this paper, we propose a novel surrogate for SDP-based learning, in which the structure of subproblem is exploited. More specifically, we surrogate unconstrained SDP by a biconvex problem, through factorizing Z as XY ⊤ and using a quadratic penalty to penalize the difference of X and Y , in which the resultant subproblems are convex. Furthermore, we provide a theory bound for the associated penalty parameter under the assumption that the objective function is Lipschitz-smooth, such that the proposed surrogate will solve the original SDP when the penalty parameter is larger than this bound. Experiments on three SDP-based machine learning problems demonstrate that the proposed algorithm is as accurate as the state-of-the-art, but is faster on large-scale learning." @default.
• W2962746230 created "2019-07-30" @default.
• W2962746230 creator A5003334032 @default.
• W2962746230 creator A5081057351 @default.
• W2962746230 date "2019-11-01" @default.
• W2962746230 modified "2023-10-17" @default.
• W2962746230 title "A new optimization in SDP-based learning" @default.
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• W2962746230 doi "https://doi.org/10.1016/j.neucom.2019.06.058" @default.
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