about gat_layer

[adverbial03]

Thank you for your excellent work.
I don’t understand something about the gat layer. Your graph_attention is implemented with the function make_attention_input, but it seems that you just copied and spliced x(v) in various ways. I can’t understand how this part implements graph_attention. Can you explain it in detail? ?
In addition, if I want to build a graph that is not fully connected (each node has a fixed number of edges), is this possible?