Search Results for author: Francesco Bullo

Found 25 papers, 4 papers with code

Perspectives on Contractivity in Control, Optimization, and Learning

no code implementations17 Apr 2024 Alexander Davydov, Francesco Bullo

Contraction theory is a mathematical framework for studying the convergence, robustness, and modularity properties of dynamical systems and algorithms.

Learning Neural Contracting Dynamics: Extended Linearization and Global Guarantees

no code implementations12 Feb 2024 Sean Jaffe, Alexander Davydov, Deniz Lapsekili, Ambuj Singh, Francesco Bullo

Global stability and robustness guarantees in learned dynamical systems are essential to ensure well-behavedness of the systems in the face of uncertainty.

IDKM: Memory Efficient Neural Network Quantization via Implicit, Differentiable k-Means

no code implementations12 Dec 2023 Sean Jaffe, Ambuj K. Singh, Francesco Bullo

We also introduce a variant, IDKM with Jacobian-Free-Backpropagation (IDKM-JFB), for which the time complexity of the gradient calculation is independent of $t$ as well.

Efficient Neural Network Quantization

Positive Competitive Networks for Sparse Reconstruction

no code implementations7 Nov 2023 Veronica Centorrino, Anand Gokhale, Alexander Davydov, Giovanni Russo, Francesco Bullo

Our analysis leverages contraction theory to characterize the behavior of a family of firing-rate competitive networks for sparse reconstruction with and without non-negativity constraints.

Multiplayer Homicidal Chauffeur Reach-Avoid Games: A Pursuit Enclosure Function Approach

no code implementations4 Nov 2023 Rui Yan, Xiaoming Duan, Rui Zou, Xin He, Zongying Shi, Francesco Bullo

We propose a cooperative strategy for the pursuers based on subgames for multiple pursuers against one evader and optimal task allocation.

ERP

Singular Perturbation via Contraction Theory

no code implementations12 Oct 2023 Liliaokeawawa Cothren, Francesco Bullo, Emiliano Dall'Anese

In this paper, we provide a novel contraction-theoretic approach to analyze two-time scale systems.

A Stochastic Surveillance Stackelberg Game: Co-Optimizing Defense Placement and Patrol Strategy

no code implementations28 Aug 2023 Yohan John, Gilberto Diaz-Garcia, Xiaoming Duan, Jason R. Marden, Francesco Bullo

Stochastic patrol routing is known to be advantageous in adversarial settings; however, the optimal choice of stochastic routing strategy is dependent on a model of the adversary.

Learning Robust Data-based LQG Controllers from Noisy Data

no code implementations2 May 2023 Wenjie Liu, Jian Sun, Gang Wang, Francesco Bullo, Jie Chen

In this work, a data-based formulation for computing the steady-state Kalman gain is proposed based on semi-definite programming (SDP) using some noise-free input-state-output data.

Convergence, Consensus and Dissensus in the Weighted-Median Opinion Dynamics

no code implementations17 Dec 2022 Wenjun Mei, Julien M. Hendrickx, Ge Chen, Francesco Bullo, Florian Dörfler

Moreover, we prove a necessary and sufficient graph-theoretic condition for the almost-sure convergence to consensus, as well as a sufficient graph-theoretic condition for almost-sure persistent dissensus.

Robust Training and Verification of Implicit Neural Networks: A Non-Euclidean Contractive Approach

no code implementations8 Aug 2022 Saber Jafarpour, Alexander Davydov, Matthew Abate, Francesco Bullo, Samuel Coogan

Third, we use the upper bounds of the Lipschitz constants and the upper bounds of the tight inclusion functions to design two algorithms for the training and robustness verification of implicit neural networks.

Data-driven Self-triggered Control via Trajectory Prediction

no code implementations18 Jul 2022 Wenjie Liu, Jian Sun, Gang Wang, Francesco Bullo, Jie Chen

Self-triggered control, a well-documented technique for reducing the communication overhead while ensuring desired system performance, is gaining increasing popularity.

Model Predictive Control Trajectory Prediction

Comparative Analysis of Interval Reachability for Robust Implicit and Feedforward Neural Networks

1 code implementation1 Apr 2022 Alexander Davydov, Saber Jafarpour, Matthew Abate, Francesco Bullo, Samuel Coogan

We use interval reachability analysis to obtain robustness guarantees for implicit neural networks (INNs).

Minimax Flow over Acyclic Networks: Distributed Algorithms and Microgrid Application

no code implementations10 Jan 2022 Marco Coraggio, Saber Jafarpour, Francesco Bullo, Mario di Bernardo

Given a flow network with variable suppliers and fixed consumers, the minimax flow problem consists in minimizing the maximum flow between nodes, subject to flow conservation and capacity constraints.

Modeling Human-AI Team Decision Making

1 code implementation8 Jan 2022 Wei Ye, Francesco Bullo, Noah Friedkin, Ambuj K Singh

AI and humans bring complementary skills to group deliberations.

Decision Making

Robustness Certificates for Implicit Neural Networks: A Mixed Monotone Contractive Approach

no code implementations10 Dec 2021 Saber Jafarpour, Matthew Abate, Alexander Davydov, Francesco Bullo, Samuel Coogan

First, given an implicit neural network, we introduce a related embedded network and show that, given an $\ell_\infty$-norm box constraint on the input, the embedded network provides an $\ell_\infty$-norm box overapproximation for the output of the given network.

Adversarial Robustness

Data-Driven Resilient Predictive Control under Denial-of-Service

no code implementations25 Oct 2021 Wenjie Liu, Jian Sun, Gang Wang, Francesco Bullo, Jie Chen

Finally, a numerical example is given to validate the effectiveness of the proposed control method.

Model Predictive Control

Robust Implicit Networks via Non-Euclidean Contractions

1 code implementation NeurIPS 2021 Saber Jafarpour, Alexander Davydov, Anton V. Proskurnikov, Francesco Bullo

Additionally, we design a training problem with the well-posedness condition and the average iteration as constraints and, to achieve robust models, with the input-output Lipschitz constant as a regularizer.

Image Classification

A Contraction Theory Approach to Optimization Algorithms from Acceleration Flows

no code implementations18 May 2021 Pedro Cisneros-Velarde, Francesco Bullo

Much recent interest has focused on the design of optimization algorithms from the discretization of an associated optimization flow, i. e., a system of differential equations (ODEs) whose trajectories solve an associated optimization problem.

Resilient Control under Quantization and Denial-of-Service: Co-designing a Deadbeat Controller and Transmission Protocol

no code implementations22 Mar 2021 Wenjie Liu, Jian Sun, Gang Wang, Francesco Bullo, Jie Chen

When both input and output channels are subject to DoS attacks and quantization, the proposed structure is shown able to decouple the encoding schemes for input, output, and estimated output signals.

Quantization

Distributed Wasserstein Barycenters via Displacement Interpolation

no code implementations15 Dec 2020 Pedro Cisneros-Velarde, Francesco Bullo

Consider a multi-agent system whereby each agent has an initial probability measure.

Sociology

Expertise and confidence explain how social influence evolves along intellective tasks

1 code implementation13 Nov 2020 Omid Askarisichani, Elizabeth Y. Huang, Kekoa S. Sato, Noah E. Friedkin, Francesco Bullo, Ambuj K. Singh

Lastly, we propose a novel approach using deep neural networks on a pre-trained text embedding model for predicting the influence of individuals.

Policy Evaluation and Seeking for Multi-Agent Reinforcement Learning via Best Response

no code implementations17 Jun 2020 Rui Yan, Xiaoming Duan, Zongying Shi, Yisheng Zhong, Jason R. Marden, Francesco Bullo

With this knowledge we propose a class of perturbed SBRD with the following property: only policies with maximum metric are observed with nonzero probability for a broad class of stochastic games with finite memory.

Multi-agent Reinforcement Learning reinforcement-learning +1

Topology Inference with Multivariate Cumulants: The Möbius Inference Algorithm

no code implementations16 May 2020 Kevin D. Smith, Saber Jafarpour, Ananthram Swami, Francesco Bullo

Many tasks regarding the monitoring, management, and design of communication networks rely on knowledge of the routing topology.

Management

Distributed and time-varying primal-dual dynamics via contraction analysis

no code implementations27 Mar 2020 Pedro Cisneros-Velarde, Saber Jafarpour, Francesco Bullo

In this note, we provide an overarching analysis of primal-dual dynamics associated to linear equality-constrained optimization problems using contraction analysis.

Distributed Optimization

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