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Xun Shen

5 accepted papers

2025

Offline Guarded Safe Reinforcement Learning for Medical Treatment Optimization Strategies

NeurIPS 2025spotlight

When applying offline reinforcement learning (RL) in healthcare scenarios, the out-of-distribution (OOD) issues pose significant risks, as inappropriate generalization beyond clinical expertise can result in potentially harmful recommendations. While existing methods like conservative Q-learning (C…

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2024

A Survey of Constraint Formulations in Safe Reinforcement Learning

IJCAI 2024poster

Safety is critical when applying reinforcement learning (RL) to real-world problems. As a result, safe RL has emerged as a fundamental and powerful paradigm for optimizing an agent’s policy while incorporating notions of safety. A prevalent safe RL approach is based on a constrained criterion, which…

2024

Flipping-based Policy for Chance-Constrained Markov Decision Processes

NeurIPS 2024poster

Safe reinforcement learning (RL) is a promising approach for many real-world decision-making problems where ensuring safety is a critical necessity. In safe RL research, while expected cumulative safety constraints (ECSCs) are typically the first choices, chance constraints are often more pragmatic…

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2023

Safe Exploration in Reinforcement Learning: A Generalized Formulation and Algorithms

NeurIPS 2023poster

Safe exploration is essential for the practical use of reinforcement learning (RL) in many real-world scenarios. In this paper, we present a generalized safe exploration (GSE) problem as a unified formulation of common safe exploration problems. We then propose a solution of the GSE problem in the f…

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2020

Cooperative Comfortable-Driving at Signalized Intersections for Connected and Automated Vehicles

RA-L 2020

This letter proposes a control framework for Connected and Automated Vehicles(CAVs) to approach the signalized intersections with good driving-comfortability. Both the velocity plan and longitudinal dynamics control are concerned in this study. Regarding the velocity plan problem, a two-layer framew

Cited by 37Source ↗Scholar ↗