Machine Learning Algorithms & Natural Language Processing
Feb 24, 2026 · Artificial Intelligence
From Traditional RL to LLM‑RL: Theory Derivation and Engineering Improvements
The article walks through the fundamentals of traditional policy‑gradient reinforcement learning, derives the Reinforce objective, maps its concepts to large‑language‑model RL, and then discusses practical engineering solutions such as GRPO, async rollout, importance‑sampling corrections, and token‑flow management for industrial‑scale training.
Async RolloutGRPOImportance Sampling
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