arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2012.10423math.OCcs.LGcs.SYeess.SY
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参数约束最小二乘问题中变量个数的减少

Reduction of the Number of Variables in Parametric Constrained Least-Squares Problems

IMT School for Advanced Studies Lucca(IMT卢卡高等研究院);ODYS S.r.l.(ODYS有限责任公司)

Alberto Bemporad, Gionata Cimini

摘要:

对于依赖于参数向量的线性约束最小二乘问题,本文提出了减少所涉及的优化变量的数量的技术。首先消除等式约束的数值鲁棒的QR分解后,我们提出了一种基于奇异值分解(SVD)和无监督学习的技术,我们称之为$K$ -SVD,神经分类器自动分区的参数向量集在$K$非线性区域中,原始问题是近似使用一组较小的变量。针对模型预测控制(MPC)中参数约束最小二乘问题的特殊情况,提出了一种新的非常有效的消除等式约束的QR分解方法.与SVD或$K$ -SVD一起,该方法提供了对标准压缩和移动阻塞以及对用于基于基函数的MPC的其他复杂度降低方法的数值鲁棒替代。我们在数值测试和线性化MPC问题的非线性基准过程中表现出良好的性能所提出的技术。

英文摘要:

For linearly constrained least-squares problems that depend on a vector of parameters, this paper proposes techniques for reducing the number of involved optimization variables. After first eliminating equality constraints in a numerically robust way by QR factorization, we propose a technique based on singular value decomposition (SVD) and unsupervised learning, that we call $K$-SVD, and neural classifiers to automatically partition the set of parameter vectors in $K$ nonlinear regions in which the original problem is approximated by using a smaller set of variables. For the special case of parametric constrained least-squares problems that arise from model predictive control (MPC) formulations, we propose a novel and very efficient QR factorization method for equality constraint elimination. Together with SVD or $K$-SVD, the method provides a numerically robust alternative to standard condensing and move blocking, and to other complexity reduction methods for MPC based on basis functions. We show the good performance of the proposed techniques in numerical tests and in a linearized MPC problem of a nonlinear benchmark process.

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