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arXiv 1609.06576math.OC
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非凸/不可微optimization中对偶上升的收敛性

Convergence of dual ascent in non-convex/non-differentiable optimization

Fredrik Andersson, Marcus Carlsson, Carl Olsson

摘要:

我们重新审视了经典的对偶上升算法的最小化凸泛函的线性约束的存在下,并给出收敛性的结果,适用于非凸泛函。我们用凸包络来描述极限点。我们还介绍了一个新的增广版本,这是具有优越的收敛性能,并提供新的结果,即使是凸的,但不可微的目标泛函(以及非凸)。结果适用于低秩逼近的一个给定的矩阵,受到线性约束。特别地,让线性约束强制相应矩阵的Hankel结构,该算法可以应用于复频率估计。我们在此设置中提供数值测试。

英文摘要:

We revisit the classical dual ascent algorithm for minimization of convex functionals in the presence of linear constraints, and give convergence results which apply even for non-convex functionals. We describe limit points in terms of the convex envelope. We also introduce a new augmented version, which is shown to have superior convergence properties, and provide new results even for convex but non-differentiable objective functionals (as well as non-convex). The results are applied to low rank approximation of a given matrix, subject to linear constraints. In particular, letting the linear constraints enforce Hankel structure of the respective matrices, the algorithms can be applied to complex frequency estimation. We provide numerical tests in this setting.

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