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Exploring Transferability of Perturbations in Deep Reinforcement Learning

The use of Deep Neural Networks (DNNs) as function approximators has led to striking progress for reinforcement learning algorithms and applications. At the same time, deep reinforcement learning agents have inherited the vulnerability of DNNs to imperceptible adversarial perturbations to their inputs. Prior work on adversarial perturbations for deep reinforcement learning has generally relied on calculating an adversarial perturbation customized to each state visited by the agent. In this paper we propose a more realistic threat model in which the adversary computes the perturbation only once based on a single state. Furthermore, we show that to cause a deep reinforcement learning agent to fail it is enough to have only one adversarial offset vector in a black-box setting. We conduct experiments in various games from the Atari environment, and use our single-state adversaries to demonstrate the transferability of perturbations both between states of one MDP, and between entirely different MDPs. We believe our adversary framework reveals fundamental properties of the environments used in deep reinforcement learning training, and is a tangible step towards building robust and reliable deep reinforcement learning agents.

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