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Clipped IS-weight Policy Optimization
Posts and notes tagged with Clipped IS-weight Policy Optimization.
- September 4, 202610 min read
Clipped IS-weight Policy Optimization (CISPO)
How CISPO, from MiniMax-M1, keeps every token in the gradient: instead of clipping token updates like PPO and GRPO, which silently drops rare reasoning tokens such as 'Wait' and 'However', it clips the importance sampling weight and lets every token keep learning.