Many thanks for the information. Yes, you are right, after intentionally add extra vertices, which should belong to other "communities", the function works and provide difference community numbers in the output.
I have another question: Does graph tool provide support for community detection on directed weighted graphs? I can see "eweight" can be provided for minimize_blockmodel_dl, but it is only for "multigraph". Would you please help confirm on this. Thanks again.
Best Regards Junjun
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