Search Results for author: Shaoru Chen

Found 12 papers, 5 papers with code

Verification-Aided Learning of Neural Network Barrier Functions with Termination Guarantees

no code implementations12 Mar 2024 Shaoru Chen, Lekan Molu, Mahyar Fazlyab

With a convex formulation of the barrier function synthesis, we propose to first learn an empirically well-behaved NN basis function and then apply a fine-tuning algorithm that exploits the convexity and counterexamples from the verification failure to find a valid barrier function with finite-step termination guarantees: if there exist valid barrier functions, the fine-tuning algorithm is guaranteed to find one in a finite number of iterations.

Self-Supervised Learning valid

Learning Performance-Oriented Control Barrier Functions Under Complex Safety Constraints and Limited Actuation

1 code implementation11 Jan 2024 Shaoru Chen, Mahyar Fazlyab

Control Barrier Functions (CBFs) provide an elegant framework for designing safety filters for nonlinear control systems by constraining their trajectories to an invariant subset of a prespecified safe set.

Self-Supervised Learning

PcLast: Discovering Plannable Continuous Latent States

no code implementations6 Nov 2023 Anurag Koul, Shivakanth Sujit, Shaoru Chen, Ben Evans, Lili Wu, Byron Xu, Rajan Chari, Riashat Islam, Raihan Seraj, Yonathan Efroni, Lekan Molu, Miro Dudik, John Langford, Alex Lamb

Goal-conditioned planning benefits from learned low-dimensional representations of rich, high-dimensional observations.

Safety Filter Design for Neural Network Systems via Convex Optimization

1 code implementation16 Aug 2023 Shaoru Chen, Kong Yao Chee, Nikolai Matni, M. Ani Hsieh, George J. Pappas

With the increase in data availability, it has been widely demonstrated that neural networks (NN) can capture complex system dynamics precisely in a data-driven manner.

Robust Model Predictive Control of Time-Delay Systems through System Level Synthesis

no code implementations23 Sep 2022 Shaoru Chen, Ning-Yuan Li, Victor M. Preciado, Nikolai Matni

In the proposed method, a time-varying feedback control policy is optimized such that the robust satisfaction of all constraints for the closed-loop system is guaranteed.

Model Predictive Control

One-Shot Reachability Analysis of Neural Network Dynamical Systems

no code implementations23 Sep 2022 Shaoru Chen, Victor M. Preciado, Mahyar Fazlyab

The arising application of neural networks (NN) in robotic systems has driven the development of safety verification methods for neural network dynamical systems (NNDS).

Differentiable Safe Controller Design through Control Barrier Functions

no code implementations20 Sep 2022 Shuo Yang, Shaoru Chen, Victor M. Preciado, Rahul Mangharam

Learning-based controllers, such as neural network (NN) controllers, can show high empirical performance but lack formal safety guarantees.

Robust Model Predictive Control with Polytopic Model Uncertainty through System Level Synthesis

2 code implementations21 Mar 2022 Shaoru Chen, Victor M. Preciado, Manfred Morari, Nikolai Matni

However, it is challenging to design LTV state feedback controllers in the face of model uncertainty whose effects are difficult to bound.

Model Predictive Control

System Level Synthesis-based Robust Model Predictive Control through Convex Inner Approximation

1 code implementation10 Nov 2021 Shaoru Chen, Nikolai Matni, Manfred Morari, Victor M. Preciado

We propose a robust model predictive control (MPC) method for discrete-time linear time-invariant systems with norm-bounded additive disturbances and model uncertainty.

Model Predictive Control

Learning Region of Attraction for Nonlinear Systems

no code implementations2 Oct 2021 Shaoru Chen, Mahyar Fazlyab, Manfred Morari, George J. Pappas, Victor M. Preciado

Estimating the region of attraction (ROA) of general nonlinear autonomous systems remains a challenging problem and requires a case-by-case analysis.

DeepSplit: Scalable Verification of Deep Neural Networks via Operator Splitting

1 code implementation16 Jun 2021 Shaoru Chen, Eric Wong, J. Zico Kolter, Mahyar Fazlyab

Analyzing the worst-case performance of deep neural networks against input perturbations amounts to solving a large-scale non-convex optimization problem, for which several past works have proposed convex relaxations as a promising alternative.

Image Classification

Learning Lyapunov Functions for Hybrid Systems

no code implementations22 Dec 2020 Shaoru Chen, Mahyar Fazlyab, Manfred Morari, George J. Pappas, Victor M. Preciado

By designing the learner and the verifier according to the analytic center cutting-plane method from convex optimization, we show that when the set of Lyapunov functions is full-dimensional in the parameter space, our method finds a Lyapunov function in a finite number of steps.

Optimization and Control

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