GRPO and OPD defined as actor-only PPO variants with specific critic functions
bronzeagepapi · x · 2026-08-15
The author proposes technical definitions: GRPO is an actor-only PPO where V is a Monte Carlo group mean of a sparse verifier; OPD is an actor-only PPO where Q is a teacher policy's log-prob.
Related event: GRPO and OPD Defined as Actor-Only PPO Variants(2 posts)→
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