Safe Meta-Reinforcement Learning via Information Space Reachability
Safe meta-RL framework reasons about safety in information space, learning a safety value function used for safety filtering and constrained policy optimization.
The paper proposes safe meta-RL that reasons about safety in information space, capturing both physical state and the agent's belief over the underlying task. A safety value function measures the probability of avoiding unsafe regions indefinitely and satisfies a self-consistency condition and Bellman equation, making it learnable via meta-RL. The resulting algorithm uses the learned function for safety filtering and constrained policy optimization, with effectiveness demonstrated on meta-RL benchmarks.