John Schulman(@johnschulman2):PPO had a second wave in the LLM era for reasons unanticipated by the original paper - the importance-ratio objective fixes biases from numeric error, async training, and forward pass noise - the clipping objective affects entropy through a mechanism that we didn't know about at the time of publication (DAPO,

John Schulman

@johnschulman2

@thinkymachines. Interested in reinforcement learning, alignment, birds, jazz music

Joined May 2021

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John Schulman@johnschulman2

2026.06.18 00:54

PPO had a second wave in the LLM era for reasons unanticipated by the original paper - the importance-ratio objective fixes biases from numeric error, async training, and forward pass noise - the clipping objective affects entropy through a mechanism that we didn't know about at the time of publication (DAPO,