Reading GML files raises NetworkXError: edge is duplicated

[Aika]

Hi, I noticed that the nx.read_gml( ) function is throwing NetworkXError for some gml files when edge is duplicated. I didn't encounter this error previously for the same command and dataset. I am re-running the code I wrote a year ago using the command

P = nx.read_gml("polblogs.gml")

and I am now encountering the error. I have uploaded the dataset obtained from here for reproducibility. 

Any insight will be greatly appreciated. Thank you.

[Aric Hagberg]

Hi  - It looks like the code has changed significantly since your previous experience.   I didn't look into the details yet. A workaround for this error is to add "multigraph 1" to the header of the file to reflect that it has multiple edges

graph [

  directed 1

  multigraph 1

  node [

    id 1

...

The previous version of read_gml figured out whether the input file was a graph or multigraph by inspecting all of the edges.

Aric

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[Aika]

Thanks so much for the quick response, Aric! I really appreciate it!

[Aroua Berriche]

Hi, I have the same problem, I use multiple edges and I have an error message as represented in the figure.

Can you help me, please! Thank you.