A (Long) Peek into Reinforcement Learning
lilianweng.github.io- Category
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- @lilianweng
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- Jul 21, 2026
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[Updated on 2020-09-03: Updated the algorithm of SARSA and Q-learning so that the difference is more pronounced. [Updated on 2021-09-19: Thanks to 爱吃猫的鱼, we have this post in Chinese ].
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A rigorous, foundational walkthrough of core RL algorithms (SARSA, Q-learning, policy gradients) that grounds the concepts increasingly relevant to agent training and RLHF-style fine-tuning, with clear explanations of how the methods actually differ.
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