SMF adds KV memory layers and sparsely updates only heavily-read rows, yielding +2.5pp on MedMCQA with near-zero drift on WikiText and TriviaQA probes versus larger gains but clear forgetting from LoRA and full finetuning.
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Sparse Memory Finetuning as a Low-Forgetting Alternative to LoRA and Full Finetuning
SMF adds KV memory layers and sparsely updates only heavily-read rows, yielding +2.5pp on MedMCQA with near-zero drift on WikiText and TriviaQA probes versus larger gains but clear forgetting from LoRA and full finetuning.