Restricting LoRA fine-tuning to the subspace of 196 trusted adapters blocks label-inversion poisoning and provides a built-in OOD signal, at the cost of a plasticity ceiling on poorly-covered tasks.
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Learning Only What Valid Adapters Can Express: Subspace-Constrained Adaptation Against Fine-Tuning Poisoning
Restricting LoRA fine-tuning to the subspace of 196 trusted adapters blocks label-inversion poisoning and provides a built-in OOD signal, at the cost of a plasticity ceiling on poorly-covered tasks.