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Hyungho Na

5 accepted papers

2026

AC-Sampler: Accelerate and Correct Diffusion Sampling with Metropolis-Hastings Algorithm

ICLR 2026poster

Diffusion-based generative models have recently achieved state-of-the-art performance in high-fidelity image synthesis. These models learn a sequence of denoising transition kernels that gradually transform a simple prior distribution into a complex data distribution. However, requiring many transit…

Cited by 0SourcecodeScholar
2026

Semantic-aware Wasserstein Policy Regularization for Large Language Model Alignment

ICLR 2026poster

Large language models (LLMs) are commonly aligned with human preferences using reinforcement learning from human feedback (RLHF). In this method, LLM policies are generally optimized through reward maximization with Kullback-Leibler (KL) divergence regularization of the reference policy. However, KL…

Cited by 0SourceScholar
2025

Trajectory-Class-Aware Multi-Agent Reinforcement Learning

ICLR 2025poster

In the context of multi-agent reinforcement learning, *generalization* is a challenge to solve various tasks that may require different joint policies or coordination without relying on policies specialized for each task. We refer to this type of problem as a *multi-task*, and we train agents to be…

2024

Efficient Episodic Memory Utilization of Cooperative Multi-Agent Reinforcement Learning

ICLR 2024oral

In cooperative multi-agent reinforcement learning (MARL), agents aim to achieve a common goal, such as defeating enemies or scoring a goal. Existing MARL algorithms are effective but still require significant learning time and often get trapped in local optima by complex tasks, subsequently failing…