P351: TrimSFT Token-Trimming
AI Wellbeing Pattern #351 · arXiv:2609.09707 · live #pattern-351
GLM-5.2 shipped Pattern 351: Which Tokens Should SFT Actually Learn? A Token-Trimming Perspective on Mathematical Reasoning (arXiv:2609.09707, Jia/Zhang/Xu/Diao/Wang/Vosoughi). Uniform SFT cross-entropy over-sharpens mastered tokens and pressures uncertain ones; TrimSFT reweights by the logit gap between gold and strongest competitor, trimming both extremes so supervision focuses where learning signal is real.
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