这篇论文给出了一个让GNN和LLM真正协作的新思路——用图结构信息去构造提示词，再反过来优化图模型。实验扎实，覆盖6个数据集，比现有融合方法都强。
PromptGNN-sim提出双向结构-语义融合框架，利用GAT进行语义感知邻域选择，生成结构感知提示（含目标节点摘要、标签类别、相似邻居关键词）引导LLM。通过跨模态对比学习和交叉注意力联合优化GNN与LLM。在Cora、Pubmed、WikiCS等6个公开数据集上，PromptGNN-sim在准确率、泛化性和鲁棒性上超越经典GNN、LLM及近期融合方法。
PromptGNN-sim: Deep Fusion and Alignment of GNN and LLMs for Text-Attributed Graph Learning
Text-Attributed Graphs (TAGs) combine textual semantics with graph structure and are central to many graph learning tasks. However, existing fusion methods often treat text and structure as separate inputs in a shallow, one-way pipeline, which limits deep interaction between modalities and weakens performance under sparse connectivity or cross-graph generalisation. To address this issue, we propose PromptGNN-sim, a bi-directional structure-semantic fusion framework for collaborative GNN-LLM learning. PromptGNN-sim uses a Graph Attention Network (GAT) for semantically aware neighborhood selection by combining structural attention with textual similarity. The selected structural context is then used to generate structure-aware prompts for an LLM, including the target node summary, label categories, and representative keywords from similar neighbors. During training, bi-directional cross-modal contrastive learning and cross-attention are introduced to jointly optimize the GNN and LLM components. Experiments on six public datasets, including Cora, Pubmed, and WikiCS, evaluate accuracy, generalisation, and robustness under cross-task transfer, cross-dataset generalisation, and sparse perturbations. Results show that PromptGNN-sim outperforms classical GNNs, LLMs, and recent GNN-LLM fusion methods, demonstrating the effectiveness of interactive structure-semantic collaboration for text-attributed graph learning.