question about the adjacency matrix

[Sandydreamsmile]

When I read the papers, I saw a lot of formulas on how to calculate the adjacency matrix. We need matrix D and A in the formula as well.
But when I read the code in this project, I found that you calculate the adj matrix without D. And I also don't understand how you calculate the adj. Could you explain it in the simple way?
Thanks very much.

[Sandydreamsmile]

I understand by reading http://tkipf.github.io/graph-convolutional-networks/

[smiles724]

Thanks for your explanation