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Rei Sato

4 accepted papers

2025

A Provable Approach for End-to-End Safe Reinforcement Learning

NeurIPS 2025poster

A longstanding goal in safe reinforcement learning (RL) is a method to ensure the safety of a policy throughout the entire process, from learning to operation. However, existing safe RL paradigms inherently struggle to achieve this objective. We propose a method, called Provably Lifetime Safe RL (PL…

Cited by 0SourceScholar
2024

Stepwise Alignment for Constrained Language Model Policy Optimization

NeurIPS 2024poster

Safety and trustworthiness are indispensable requirements for real-world applications of AI systems using large language models (LLMs). This paper formulates human value alignment as an optimization problem of the language model policy to maximize reward under a safety constraint, and then proposes…

2022

Max-Min Off-Policy Actor-Critic Method Focusing on Worst-Case Robustness to Model Misspecification

NeurIPS 2022accept

In the field of reinforcement learning, because of the high cost and risk of policy training in the real world, policies are trained in a simulation environment and transferred to the corresponding real-world environment. However, the simulation environment does not perfectly mimic the real-world en…

2021

AdvantageNAS: Efficient Neural Architecture Search with Credit Assignment

AAAI 2021technical

Neural architecture search (NAS) is an approach for automatically designing a neural network architecture without human effort or expert knowledge. However, the high computational cost of NAS limits its use in commercial applications. Two recent NAS paradigms, namely one-shot and sparse propagation,…