Researchers Frame PPO vs GRPO as Bias-Variance Trade-off
A researcher proposes a directional bias-variance framework for policy gradient estimators, arguing GRPO needs larger batch sizes than PPO—especially on long tasks where variance explodes—to match its performance.
2026-11-11 ~ 2026-11-11 · 2 related posts
- GRPO needs larger batches than PPO to match it, variance explodes on longer tasks — stochasticchasm · 2026-11-11
- Why batch size decides PPO vs GRPO: a directional bias-variance view — stochasticchasm · 2026-11-11