hi,
i received this error while trying to assign a vertex property map to a graph,
and i'm not sure how to get around it.
context: i am running minimize_blockmodel_dl() many times in parallel using
microprocessing. because my graph is large, i don't want it to save multiple
copies of the graph. so i am trying to only keep the block id each time.
however, when i try to do this, i get the above error
here's a somewhat simplified example:
```
import graph_tool.all as gt
import multiprocessing as mp
pool = mp.Pool(5)
def fit_sbm():
state = gt.minimize_blockmodel_dl(g)
b = state.get_blocks()
return b
blocks = pool.map(fit_sbm, range(5))
pool.close
b0 = blocks[0]
membership = g.new_vertex_property("int")
membership = b0
g.vertex_properties["membership"] = b0
```
could you explain why this error comes up, and also if possible suggest an
alternative way to proceed?
thanks,
-sam
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