How the diagram structure is determined

[Master-hlf]

Hello author, I read your paper 《Exploiting Geometric Features via Hierarchical Graph Pyramid Transformer for Cancer Diagnosis Using Histopathological Images》, because I first contact with the GNN network, for the determination of the node characteristics of the network and node embedding methods, graph structure, there is confusion, the relevant code do not know how to write, I hope that you can share this part of the code in order to understand, I am very much looking forward to your answer. I hope you can share this part of the code so as to understand it, and I look forward to your reply!