After running an inference method such as:

graph_tool.inference.minimize_blockmodel_dl()

I get back a  graph_tool.inference.BlockState,

which provides a PropertyMap on the vertices

which i can use to tell which group a vertex is in. 

However, if i need to find out all the other members

of the same group, (suppose i need to find out who/what

else is in the same group as a particular vertex, is there

a way to list the groups members other than looping though all

vertices and querying their group in the Propertymap? 

As a bonus, i have a bit of a background in scientific application

support as a scientist+sysadmin, so here are Fedora 23/24

graph_tool packages for the Fedora users  out there, made with love using the opensuse OBS.

For more info look here:

I second your advise to use the prebuilt packages that the project has already provided,

the compile time resources needed are non trivial :(https://build.opensuse.org/package/statistics/home:theusprom1/graph-tool?arch=x86_64&repository=Fedora_24). 

I have used these packages (im just getting started though), so YMMV.

Best.

Theos.