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Costas Spanos

3 accepted papers

2025

Don’t Trade Off Safety: Diffusion Regularization for Constrained Offline RL

NeurIPS 2025poster

Constrained reinforcement learning (RL) seeks high-performance policies under safety constraints. We focus on an offline setting where the agent learns from a fixed dataset—a common requirement in realistic tasks to prevent unsafe exploration. To address this, we propose Diffusion-Regularized Constr…

Cited by 1SourcecodeScholar
2025

Robust Gymnasium: A Unified Modular Benchmark for Robust Reinforcement Learning

ICLR 2025poster

Driven by inherent uncertainty and the sim-to-real gap, robust reinforcement learning (RL) seeks to improve resilience against the complexity and variability in agent-environment sequential interactions. Despite the existence of a large number of RL benchmarks, there is a lack of standardized benchm…

Cited by 1SourcePDFScholar
2024

Enhancing Efficiency of Safe Reinforcement Learning via Sample Manipulation

NeurIPS 2024poster

Safe reinforcement learning (RL) is crucial for deploying RL agents in real-world applications, as it aims to maximize long-term rewards while satisfying safety constraints. However, safe RL often suffers from sample inefficiency, requiring extensive interactions with the environment to learn a safe…