Data-driven, learning-based control methods offer the potential to improve operations in complex systems, and model-free deep reinforcement learning represents a popular approach to data-driven control. However, existing classes of algorithms present a trade-off between two important deployment requirements for real-world control: (i) practical performance guarantees and (ii) data efficiency. Off-policy algorithms make efficient use of data through sample reuse but lack theoretical guarantees, while on-policy algorithms guarantee approximate policy improvement throughout training but suffer from high sample complexity. In order to balance these competing goals, we develop a class of Generalized Policy Improvement algorithms that combines the policy improvement guarantees of on-policy methods with the efficiency of sample reuse. We demonstrate the benefits of this new class of algorithms through extensive experimental analysis on a variety of continuous control tasks from the DeepMind Control Suite.
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