PPO was rejected from NeurIPS in 2017; now it's the most-used RL algorithm with 45,000+ citations

IanArawjo · x · 2026-09-21

A reminder making the rounds: PPO was rejected from NeurIPS in 2017, yet it has become the most widely used RL algorithm in the world with over 45,000 citations.

With 60k ICLR submissions this year, the poster wonders how many future PPOs are being rejected right now — a classic story about peer review and the fate of ideas.

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