I am trying to calcule centrality measures in a network which is bipartite and directed (source proteins only go to target Biological Processes). It is a type of graph used in some bibliography.

In this Bibliography they calcule several centrality measures as BNC or Eigenvector centrality, but I am trying to do the same in Gephi and igraph and I obtain a BNC of 0 for all the nodes.

I think that it is because in a directed and bipartite graph it is impossible to have a path with more than 2 nodes, so the BNC will always be 0. What do you think? How could I replicate those analysis like in the bibliography?

I tried to calcule Betweeness centrality in Gephi and igraph, obtaining a 0 score in all cases.