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News/Understanding LLM Parameter Update Sparsity through the Lens of Fisher
arxiv
PublishedOctober 1, 2026 at 4:00 AM

Understanding LLM Parameter Update Sparsity through the Lens of Fisher

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arXiv:2609.36262v1 Announce Type: new Abstract: Recent studies have observed that parameter changes during language-model post-training can be concentrated in a small subset of coordinates. This phenomenon has been reported in reinforcement learning, on-policy distillation, and supervised fine-tunin

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