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Large Language ModelsAI Safety & AlignmentLessWrong AIPublished: Oct 6, 2026, 19:01 JST

Grafting cuts SDF damage on post-trained models

Grafting cuts SDF damage on post-trained models

Peter and Dani, during their MATS Fellowship, shared a modification to synthetic document fine-tuning (SDF) called grafting: fine-tune a pre-training checkpoint, then add the resulting weight difference onto the post-trained model you want to deploy. They validated it on five model families up to 284B parameters.

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