Hi Tiago, > On 3 Jul 2020, at 19:05, Tiago de Paula Peixoto <ti...@skewed.de> wrote: > > Hi Davide, > > Am 03.07.20 um 11:31 schrieb Davide Cittaro: >> Hello, >> I'm testing the new Planted Partition model in graph-tool on my data, indeed >> I'm finding interesting results. I have some questions/observations, though. >> - PPBlockState returns a relatively large number of partitions on large >> networks, which is fine and expected. When I use NSBM, instead, I make use >> of the hierarchy not only because I can "abstract" partitions up to a >> certain level, but also because the hierarchy has a meaning in my case. Is >> there (or will it be there) a hierarchical formulation of the PPBlockState? > > A hierarchical prior for the PP model is certainly feasible, and it is > something that could come up in the future, but I can't promise when. >
Would it make sense to get a graph from partitions (where edges are weighted on connectivity among them) and apply NSBM then? This would produce a mixed model where the deepest level is actually a PP, and the hierarchy doesn't assume any constraint on assortativity. >> - As far as I understand, if the assortativity is the dominant pattern the >> difference between PP and NSBM is negligible. I don't know how to quantify >> "negligible" as the differences in entropies are at least in the order of >> 1e2 in the cases I tested (seems pretty large to me); I would be happy to >> switch to PP, also given the shorter runtime so far, but I'm a bit concerned >> about these differences. > > I do not recommend simply switching to PP for every analysis. As was > described in the paper, the SBM is still a more powerful model, that is > capable of better capturing the network structure in a wider variety of > cases. You are so right. I have some datasets in which PP doesn't seem to perform as well as NSBM. > > To answer your question, you can test whether the two models give > similar answers by comparing their partitions. You can use the > partition_overlap() function for that. Ok, thanks. Another function I didn't know. Best, d _______________________________________________ graph-tool mailing list graph-tool@skewed.de https://lists.skewed.de/mailman/listinfo/graph-tool
