I just found out the following (using gt 2.29): If I create a GraphView of g and store it in g, g = gt.extract_largest_component(g) infer an SBM, state = gt.minimize_nested_blockmodel_dl(g) and try to draw it, state.draw() then I get the "RuntimeError: Invalid hierarchical tree: No path from source to target." But if I prune the graph, g = gt.extract_largest_component(g, prune=True) then everything's fine. Hope this documentation is helpful. Haiko ________________________________ Von: graph-tool <graph-tool-bounces@skewed.de> im Auftrag von Tiago de Paula Peixoto <tiago@skewed.de> Gesendet: Dienstag, 31. Oktober 2017 17:08:52 An: graph-tool@skewed.de Betreff: Re: [graph-tool] Nested Block State hierarchy level after mcmc_equilibrate On 31.10.2017 15:33, ilyco wrote:
There are many empty branches and when I try to plot it with empty_branches = False, I get an error stating it is not a tree. RuntimeError: Invalid hierarchical tree: No path from source to target.
Which version are you using? Please provide a minimal and self-contained example that shows the problem. Best, Tiago -- Tiago de Paula Peixoto <tiago@skewed.de>