Search Results for author: Giovanni Fantuzzi

Found 8 papers, 7 papers with code

Auxiliary Functions as Koopman Observables: Data-Driven Analysis of Dynamical Systems via Polynomial Optimization

2 code implementations2 Mar 2023 Jason J. Bramburger, Giovanni Fantuzzi

We present a flexible data-driven method for dynamical system analysis that does not require explicit model discovery.

Model Discovery

Finding unstable periodic orbits: a hybrid approach with polynomial optimization

no code implementations25 Jan 2021 Mayur Lakshmi, Giovanni Fantuzzi, Sergei Chernyshenko, Davide Lasagna

We present a novel method to compute unstable periodic orbits (UPOs) that optimize the infinite-time average of a given quantity for polynomial ODE systems.

Dynamical Systems Optimization and Control Chaotic Dynamics

Sum-of-squares chordal decomposition of polynomial matrix inequalities

2 code implementations22 Jul 2020 Yang Zheng, Giovanni Fantuzzi

Third, we prove that if $P$ is positive definite on a compact semialgebraic set $\mathcal{K}=\{x:g_1(x)\geq 0,\ldots, g_m(x)\geq 0\}$ satisfying the Archimedean condition, then $P(x) = S_0(x) + g_1(x)S_1(x) + \cdots + g_m(x)S_m(x)$ for matrices $S_i(x)$ that are sums of sparse SOS matrices.

Optimization and Control Data Structures and Algorithms Systems and Control Systems and Control Algebraic Geometry

Sparse sum-of-squares (SOS) optimization: A bridge between DSOS/SDSOS and SOS optimization for sparse polynomials

2 code implementations14 Jul 2018 Yang Zheng, Giovanni Fantuzzi, Antonis Papachristodoulou

Optimization over non-negative polynomials is fundamental for nonlinear systems analysis and control.

Optimization and Control Systems and Control

Decomposition and Completion of Sum-of-Squares Matrices

2 code implementations8 Apr 2018 Yang Zheng, Giovanni Fantuzzi, Antonis Papachristodoulou

We show that a subset of sparse SOS matrices with chordal sparsity patterns can be equivalently decomposed into a sum of multiple SOS matrices that are nonzero only on a principal submatrix.

Optimization and Control Systems and Control

Chordal decomposition in operator-splitting methods for sparse semidefinite programs

2 code implementations17 Jul 2017 Yang Zheng, Giovanni Fantuzzi, Antonis Papachristodoulou, Paul Goulart, Andrew Wynn

We employ chordal decomposition to reformulate a large and sparse semidefinite program (SDP), either in primal or dual standard form, into an equivalent SDP with smaller positive semidefinite (PSD) constraints.

Optimization and Control

Fast ADMM for homogeneous self-dual embedding of sparse SDPs

2 code implementations6 Nov 2016 Yang Zheng, Giovanni Fantuzzi, Antonis Papachristodoulou, Paul Goulart, Andrew Wynn

We propose an efficient first-order method, based on the alternating direction method of multipliers (ADMM), to solve the homogeneous self-dual embedding problem for a primal-dual pair of semidefinite programs (SDPs) with chordal sparsity.

Optimization and Control

Fast ADMM for Semidefinite Programs with Chordal Sparsity

2 code implementations20 Sep 2016 Yang Zheng, Giovanni Fantuzzi, Antonis Papachristodoulou, Paul Goulart, Andrew Wynn

We show that chordal decomposition can be applied to either the primal or the dual standard form of a sparse SDP, resulting in scaled versions of ADMM algorithms with the same computational cost.

Optimization and Control

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