NeuroAda: Activating Each Neuron's Potential for Parameter-Efficient Fine-Tuning

• URL: http://arxiv.org/abs/2510.18940v1
• Date: Tue, 21 Oct 2025 17:59:24 GMT
• Title: NeuroAda: Activating Each Neuron's Potential for Parameter-Efficient Fine-Tuning
• Authors: Zhi Zhang, Yixian Shen, Congfeng Cao, Ekaterina Shutova,
• Abstract summary: NeuroAda is a novel PEFT method that enables fine-grained model finetuning while maintaining high memory efficiency.<n>We show that NeuroAda achieves state-of-the-art performance with little as $leq0.02%$ trainable parameters while reducing memory usage by up to 60%.
• Score: 18.1179807699825
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Existing parameter-efficient fine-tuning (PEFT) methods primarily fall into two categories: addition-based and selective in-situ adaptation. The former, such as LoRA, introduce additional modules to adapt the model to downstream tasks, offering strong memory efficiency. However, their representational capacity is often limited, making them less suitable for fine-grained adaptation. In contrast, the latter directly fine-tunes a carefully chosen subset of the original model parameters, allowing for more precise and effective adaptation, but at the cost of significantly increased memory consumption. To reconcile this trade-off, we propose NeuroAda, a novel PEFT method that enables fine-grained model finetuning while maintaining high memory efficiency. Our approach first identifies important parameters (i.e., connections within the network) as in selective adaptation, and then introduces bypass connections for these selected parameters. During finetuning, only the bypass connections are updated, leaving the original model parameters frozen. Empirical results on 23+ tasks spanning both natural language generation and understanding demonstrate that NeuroAda achieves state-of-the-art performance with as little as $\leq \textbf{0.02}\%$ trainable parameters, while reducing CUDA memory usage by up to 60%. We release our code here: https://github.com/FightingFighting/NeuroAda.git.

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