It looks like reading graphml is a problem. I saved out a land graph and read it back in and found that the nodes came in as string representations of tuples instead of actual tuples. This causes a number of problems. gpickle may be better. Also, the graphml version was over twice as large.
It looks like this is still and issue. Changes were being made to networkx's graphml read/write as recent as 7/31/2017. We will not support this format for now.
It looks like reading graphml is a problem. I saved out a land graph and read it back in and found that the nodes came in as string representations of tuples instead of actual tuples. This causes a number of problems. gpickle may be better. Also, the graphml version was over twice as large.