Search Results for author: Fabio Pasqualetti

Found 26 papers, 1 papers with code

Analytical Characterization of Epileptic Dynamics in a Bistable System

no code implementations4 Apr 2024 Yuzhen Qin, Ahmed El-Gazzar, Danielle S. Bassett, Fabio Pasqualetti, Marcel van Gerven

In this paper, we employ a bistable model, where a stable equilibrium and a stable limit cycle coexist, to describe epileptic dynamics.

Denoising Diffusion-Based Control of Nonlinear Systems

1 code implementation3 Feb 2024 Karthik Elamvazhuthi, Darshan Gadginmath, Fabio Pasqualetti

We learn to control a dynamical system in reverse such that the terminal state belongs to the target set.

Denoising

Noise in the reverse process improves the approximation capabilities of diffusion models

no code implementations13 Dec 2023 Karthik Elamvazhuthi, Samet Oymak, Fabio Pasqualetti

We use a control theoretic perspective by posing the approximation of the reverse process as a trajectory tracking problem.

Fusing Multiple Algorithms for Heterogeneous Online Learning

no code implementations9 Dec 2023 Darshan Gadginmath, Shivanshu Tripathi, Fabio Pasqualetti

This study addresses the challenge of online learning in contexts where agents accumulate disparate data, face resource constraints, and use different local algorithms.

Astrocytes as a mechanism for meta-plasticity and contextually-guided network function

no code implementations6 Nov 2023 Lulu Gong, Fabio Pasqualetti, Thomas Papouin, ShiNung Ching

We then embed this model in a bandit-based reinforcement learning task environment, and show how the presence of time-scale separated astrocytic modulation enables learning over multiple fluctuating contexts.

Learning on Manifolds: Universal Approximations Properties using Geometric Controllability Conditions for Neural ODEs

no code implementations15 May 2023 Karthik Elamvazhuthi, Xuechen Zhang, Samet Oymak, Fabio Pasqualetti

To address this shortcoming, in this paper we study a class of neural ordinary differential equations that, by design, leave a given manifold invariant, and characterize their properties by leveraging the controllability properties of control affine systems.

Model-based and Data-based Dynamic Output Feedback for Externally Positive Systems

no code implementations4 May 2023 Abed AlRahman Al Makdah, Fabio Pasqualetti

We leverage the static form of the controller to derive output-feedback controllers that achieve monotonic output tracking of a constant non-negative reference output.

Data-driven Eigenstructure Assignment for Sparse Feedback Design

no code implementations31 Mar 2023 Federico Celi, Giacomo Baggio, Fabio Pasqualetti

Additionally, the paper proposes a closed-form expression for the feedback gain that solves the eigenstructure assignment problem.

Imitation and Transfer Learning for LQG Control

no code implementations16 Mar 2023 Taosha Guo, Abed AlRahman Al Makdah, Vishaal Krishnan, Fabio Pasqualetti

In this paper we study an imitation and transfer learning setting for Linear Quadratic Gaussian (LQG) control, where (i) the system dynamics, noise statistics and cost function are unknown and expert data is provided (that is, sequences of optimal inputs and outputs) to learn the LQG controller, and (ii) multiple control tasks are performed for the same system but with different LQG costs.

Transfer Learning

Stochastic Contextual Bandits with Long Horizon Rewards

no code implementations2 Feb 2023 Yuzhen Qin, Yingcong Li, Fabio Pasqualetti, Maryam Fazel, Samet Oymak

The growing interest in complex decision-making and language modeling problems highlights the importance of sample-efficient learning over very long horizons.

Decision Making Language Modelling +1

Multi-Task System Identification of Similar Linear Time-Invariant Dynamical Systems

no code implementations4 Jan 2023 Yiting Chen, Ana M. Ospina, Fabio Pasqualetti, Emiliano Dall'Anese

This paper presents a system identification framework -- inspired by multi-task learning -- to estimate the dynamics of a given number of linear time-invariant (LTI) systems jointly by leveraging structural similarities across the systems.

Federated Learning Multi-Task Learning

Behavioral Feedback for Optimal LQG Control

no code implementations1 Apr 2022 Abed AlRahman Al Makdah, Vishaal Krishnan, Vaibhav Katewa, Fabio Pasqualetti

In this work, we revisit the Linear Quadratic Gaussian (LQG) optimal control problem from a behavioral perspective.

Data-driven Meets Geometric Control: Zero Dynamics, Subspace Stabilization, and Malicious Attacks

no code implementations10 Jan 2022 Federico Celi, Fabio Pasqualetti

Studying structural properties of linear dynamical systems through invariant subspaces is one of the key contributions of the geometric approach to system theory.

Parameter Conditions to Prevent Voltage Oscillations Caused by LTC-Inverter Hunting on Power Distribution Grids

no code implementations8 Nov 2021 Jaimie Swartz, Federico Celi, Fabio Pasqualetti, Alexandra von Meier

As more distributed energy resources (DERs) are connected to the power grid, it becomes increasingly important to ensure safe and effective coordination between legacy voltage regulation devices and inverter-based DERs.

Robust Adversarial Classification via Abstaining

no code implementations6 Apr 2021 Abed AlRahman Al Makdah, Vaibhav Katewa, Fabio Pasqualetti

We propose metrics to quantify the nominal performance of a classifier with an abstain option and its robustness against adversarial perturbations.

Adversarial Robustness Binary Classification +3

Structural underpinnings of control in multiplex networks

no code implementations15 Mar 2021 Pragya Srivastava, Peter J. Mucha, Emily Falk, Fabio Pasqualetti, Danielle S. Bassett

For this purpose, we calculate the exact expression of optimal control energy in terms of layer spectra and the relative alignment between the eigenmodes of the input layer and the deeper target layer.

Phase-Amplitude Coupling in Neuronal Oscillator Networks

no code implementations8 Dec 2020 Yuzhen Qin, Tommaso Menara, Danielle S. Bassett, Fabio Pasqualetti

Phase-amplitude coupling (PAC) describes the phenomenon where the power of a high-frequency oscillation evolves with the phase of a low-frequency one.

Learning Minimum-Energy Controls from Heterogeneous Data

no code implementations18 Jun 2020 Giacomo Baggio, Fabio Pasqualetti

Then, we leverage this data-based representation to derive closed-form data-driven expressions of minimum-energy controls for a wide range of control horizons.

Lipschitz Bounds and Provably Robust Training by Laplacian Smoothing

no code implementations NeurIPS 2020 Vishaal Krishnan, Abed AlRahman Al Makdah, Fabio Pasqualetti

In contrast to regularization-based approaches, we formulate the adversarially robust learning problem as one of loss minimization with a Lipschitz constraint, and show that the saddle point of the associated Lagrangian is characterized by a Poisson equation with weighted Laplace operator.

Path-dependent connectivity, not modularity, consistently predicts controllability of structural brain networks

no code implementations16 Feb 2020 Shubhankar P. Patankar, Jason Z. Kim, Fabio Pasqualetti, Danielle S. Bassett

Yet, the precise relationship between community structure in structural brain networks and the communication dynamics that can emerge therefrom is not well-understood.

On the Robustness of Data-Driven Controllers for Linear Systems

no code implementations L4DC 2020 Rajasekhar Anguluri, Abed AlRahman Al Makdah, Vaibhav Katewa, Fabio Pasqualetti

This paper proposes a new framework and several results to quantify the performance of data-driven state-feedback controllers for linear systems against targeted perturbations of the training data.

A Fundamental Performance Limitation for Adversarial Classification

no code implementations4 Mar 2019 Abed AlRahman Al Makdah, Vaibhav Katewa, Fabio Pasqualetti

Despite the widespread use of machine learning algorithms to solve problems of technological, economic, and social relevance, provable guarantees on the performance of these data-driven algorithms are critically lacking, especially when the data originates from unreliable sources and is transmitted over unprotected and easily accessible channels.

BIG-bench Machine Learning Binary Classification +2

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