x_r and x_l. What does that stand for?

[Jeriousman]

I know x_j and x_i convention. But When I encounter x_r and x_l in the source code. I do not know what it really means and there is no explicit explanation. Can you describe what it means?

[rusty1s]

Yeah, sorry for that. I'm not so proud of this naming as well :) In general, it just means that we separate between transforming source (x_l) (for left) and destination nodes (x_r) (for right). For example, in bipartite graphs, x = (x_l, x_r) may be given as a tuple. A better naming convention would be x_src = x_l and x_dst = x_r.

[Jeriousman]

Thank you for the clarification!