Search Results for author: SiQi Zhou

Found 14 papers, 6 papers with code

Practical Considerations for Discrete-Time Implementations of Continuous-Time Control Barrier Function-Based Safety Filters

no code implementations18 Apr 2024 Lukas Brunke, SiQi Zhou, Mingxuan Che, Angela P. Schoellig

In particular, we look at the issues caused by discrete-time implementations of the continuous-time CBF-based safety filter, especially for cases where the magnitude of the Lie derivative of the CBF with respect to the control input is zero or close to zero.

Is Data All That Matters? The Role of Control Frequency for Learning-Based Sampled-Data Control of Uncertain Systems

1 code implementation14 Mar 2024 Ralf Römer, Lukas Brunke, SiQi Zhou, Angela P. Schoellig

While a strong focus has been placed on increasing the amount and quality of data to improve performance, data can never fully eliminate uncertainty, making feedback necessary to ensure stability and performance.

Gaussian Processes

An EnKF-LSTM Assimilation Algorithm for Crop Growth Model

no code implementations6 Mar 2024 SiQi Zhou, Ling Wang, Jie Liu, Jinshan Tang

However, there are large difference between the simulation results obtained by the crop models and the actual results, thus in this paper, we proposed to combine the simulation results with the collected crop data for data assimilation so that the accuracy of prediction will be improved.

Optimized Control Invariance Conditions for Uncertain Input-Constrained Nonlinear Control Systems

no code implementations15 Dec 2023 Lukas Brunke, SiQi Zhou, Mingxuan Che, Angela P. Schoellig

We demonstrate the efficacy of our proposed approach in simulation and real-world experiments on a quadrotor and show that we can achieve safe closed-loop behavior for a learned system while satisfying state and input constraints.

What is the Impact of Releasing Code with Publications? Statistics from the Machine Learning, Robotics, and Control Communities

1 code implementation19 Aug 2023 SiQi Zhou, Lukas Brunke, Allen Tao, Adam W. Hall, Federico Pizarro Bejarano, Jacopo Panerati, Angela P. Schoellig

Open-sourcing research publications is a key enabler for the reproducibility of studies and the collective scientific progress of a research community.

Robust Predictive Output-Feedback Safety Filter for Uncertain Nonlinear Control Systems

1 code implementation17 Dec 2022 Lukas Brunke, SiQi Zhou, Angela P. Schoellig

Recently, we have seen an increasing number of learning-based control algorithms developed to address the challenge of decision making under dynamics uncertainties.

Decision Making

Bridging the Model-Reality Gap with Lipschitz Network Adaptation

no code implementations7 Dec 2021 SiQi Zhou, Karime Pereida, Wenda Zhao, Angela P. Schoellig

In particular, we present a learning-based model reference adaptation approach that makes a robot system, with possibly uncertain dynamics, behave as a predefined reference model.

safe-control-gym: a Unified Benchmark Suite for Safe Learning-based Control and Reinforcement Learning in Robotics

4 code implementations13 Sep 2021 Zhaocong Yuan, Adam W. Hall, SiQi Zhou, Lukas Brunke, Melissa Greeff, Jacopo Panerati, Angela P. Schoellig

In recent years, both reinforcement learning and learning-based control -- as well as the study of their safety, which is crucial for deployment in real-world robots -- have gained significant traction.

reinforcement-learning Reinforcement Learning (RL)

Safe Learning in Robotics: From Learning-Based Control to Safe Reinforcement Learning

4 code implementations13 Aug 2021 Lukas Brunke, Melissa Greeff, Adam W. Hall, Zhaocong Yuan, SiQi Zhou, Jacopo Panerati, Angela P. Schoellig

The last half-decade has seen a steep rise in the number of contributions on safe learning methods for real-world robotic deployments from both the control and reinforcement learning communities.

Decision Making reinforcement-learning +2

Experience Selection Using Dynamics Similarity for Efficient Multi-Source Transfer Learning Between Robots

no code implementations29 Mar 2020 Michael J. Sorocky, Siqi Zhou, Angela P. Schoellig

We show that selecting experiences based on the proposed similarity metric effectively facilitates the learning of the target quadrotor, improving performance by 62% compared to a poorly selected experience.

Transfer Learning

An Analysis of the Expressiveness of Deep Neural Network Architectures Based on Their Lipschitz Constants

no code implementations24 Dec 2019 SiQi Zhou, Angela P. Schoellig

We consider this work to be a step towards understanding the expressive power of DNNs and towards designing appropriate deep architectures for practical applications such as system control.

Image Classification

An Inversion-Based Learning Approach for Improving Impromptu Trajectory Tracking of Robots with Non-Minimum Phase Dynamics

no code implementations13 Sep 2017 Siqi Zhou, Mohamed K. Helwa, Angela P. Schoellig

This paper presents a learning-based approach for impromptu trajectory tracking for non-minimum phase systems, i. e., systems with unstable inverse dynamics.

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