I tried my best to look for the solution online, but cannot seem to find one for my graph_tool network. I have a pandas dataframe df that has three columns: id_source, id_target, weight. The id_source and id_target contain names in text form. I want to use them as vertex labels. However, when adding edges from a pandas dataframe, I must set hashed=True. The code then looks like this
from graph_tool.all import *
g = Graph()
eweight = g.new_ep('double')
vmap = g.add_edge_list(df.values, eprops=[eweight], hashed=True)
My objective is to draw this small network with vertex labels. I am stuck and can't figure out the solution on how to add that vertex property when I do not know the order by which each new node is introduced in the graph through the g.add_edge_list() function.
Should I add the vertices first? And then perform the add_edge_list function on the graph. Will the vertex names (or labels) be recognized by the second step?
The answer is in the vmap. It's there all along. When you index the vmap, it will get the label names.
vmap[0] would be the label for the first vertex recorded.vmap[1] for the second, etc.