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arXiv · 2602.05567

MAGPrompt: Message-Adaptive Graph Prompt Tuning for Graph Neural Networks

Long D. Nguyen·Binh P. Nguyen
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Abstract

Pre-trained graph neural networks (GNNs) transfer well, but adapting them to downstream tasks remains challenging due to mismatches between pre-training objectives and task requirements. Graph prompt tuning offers a parameter-efficient alternative to fine-tuning, yet most methods only modify inputs or representations and leave message passing unchanged, limiting their ability to adapt neighborhood interactions. We propose message-adaptive graph prompt tuning, which injects learnable prompts into the message passing step to reweight incoming neighbor messages and add task-specific prompt vectors during message aggregation, while keeping the backbone GNN frozen. The approach is compatible with common GNN backbones and pre-training strategies, and applicable across downstream settings. Experiments on diverse node- and graph-level datasets show consistent gains over prior graph prompting methods in few-shot settings, while achieving performance competitive with fine-tuning in full-shot regimes.

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Long D. Nguyen, Binh P. Nguyen. 2026-02-05. MAGPrompt: Message-Adaptive Graph Prompt Tuning for Graph Neural Networks. https://arxiv.org/abs/2602.05567

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