GRPO needs larger batches than PPO to match it, variance explodes on longer tasks
stochasticchasm · x · 2026-11-11
stochasticchasm argues GRPO needs a higher batch size than PPO to match performance, especially on longer tasks, due to variance explosion — and praises new ablations comparing across different environment types, though the tasks (tmax) aren't too complex.
Related event: Researchers Frame PPO vs GRPO as Bias-Variance Trade-off(2 posts)→
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