Confusion about the edge indicator matrices 'pmpd' in 'Line Graph Neural Network

#1

Hello, I want to use the LGNN model on my own data, but I do not understand how the pmpd is calculated actually. In the given example code, it is just loaded from a pickle file. Can someone help me to show how to calculate this matrix?

In fact, I wonder if that its calculation can be capsuled inside the library instead fed by user.

Thanks in advance!