Reinforcement Learning: The Surrogate Objective Function in PPO

ShawnHymel · x · 2026-08-28

Part of a reinforcement learning tutorial series, this post focuses on the Surrogate Objective Function within Proximal Policy Optimization (PPO). It explains how this function enables Actor-Critic methods to practically use batched rollout data, improving sample efficiency, maintaining training stability, and reducing hyperparameter sensitivity.

Related event: New Tutorial Explains the Surrogate Objective in RL and PPO(2 posts)→

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