Technical breakdown: GRPO vs OPD PPO variants explained
bronzeagepapi · x · 2026-08-15
A technical discussion clarifies the difference between two actor-only PPO variants: GRPO uses a Monte Carlo group mean of a sparse verifier as its value function (V), while OPD uses a teacher policy's log-prob as its Q value.
Related event: GRPO and OPD Defined as Actor-Only PPO Variants(2 posts)→
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