← Search

Sang-Hyun Lee

9 accepted papers

2026

Chain-of-Goals Hierarchical Policy for Long-Horizon Offline Goal-Conditioned RL

ICML 2026poster

Offline goal-conditioned reinforcement learning remains challenging for long-horizon tasks. While hierarchical approaches mitigate this issue by decomposing tasks, most existing methods rely on separate high- and low-level networks and generate only a single intermediate subgoal, making them inadequ…

Cited by 0SourceScholar
2024

Self-Supervised Curriculum Generation for Autonomous Reinforcement Learning Without Task-Specific Knowledge

RA-L 2024

A significant bottleneck in applying current reinforcement learning algorithms to real-world scenarios is the need to reset the environment between every episode. This reset process demands substantial human intervention, making it difficult for the agent to learn continuously and autonomously. Seve

Cited by 3SourceScholar
2023

Occlusion-Aware Risk Assessment and Driving Strategy for Autonomous Vehicles Using Simplified Reachability Quantification

RA-L 2023

One of the unresolved challenges for autonomous vehicles is safe navigation among occluded pedestrians and vehicles. Previous approaches included generating phantom vehicles and assessing their risk, but they often made the ego vehicle overly conservative or could not conduct a real-time risk assess

Cited by 17SourceScholar
2023

Unsupervised Skill Discovery for Learning Shared Structures across Changing Environments

ICML 2023poster

Learning shared structures across changing environments enables an agent to efficiently retain obtained knowledge and transfer it between environments. A skill is a promising concept to represent shared structures. Several recent works proposed unsupervised skill discovery algorithms that can discov…

Cited by 3SourcePDFScholar
2020

Exploration Strategy based on Validity of Actions in Deep Reinforcement Learning

IROS 2020poster

How to explore environments is one of the most critical factors for the performance of an agent in reinforcement learning. Conventional exploration strategies such as ε-greedy algorithm and Gaussian exploration noise simply depend on pure randomness. However, it is required for an agent to consider…

Cited by 2SourceScholar
2020

Learning Compound Tasks without Task-specific Knowledge via Imitation and Self-supervised Learning

ICML 2020poster

Most real-world tasks are compound tasks that consist of multiple simpler sub-tasks. The main challenge of learning compound tasks is that we have no explicit supervision to learn the hierarchical structure of compound tasks. To address this challenge, previous imitation learning methods exploit tas…

Cited by 23SourcePDFScholar