Hi, I was going through this paper on Pregel titled, "Pregel: A System for Large-Scale Graph Processing". In the second section named Model Of Computation, it says that the input to a Pregel computation is a directed graph..... Is it the same in the Pregel abstraction of GraphX too? Do we always have to input directed graphs to Pregel abstraction or can we also give undirected graphs?
Thank You
