Inconsistent number of nodes when saving a graph

[raymon X]

Hey All, I struggle to find a solution to this issue.

I created a graph with

> G = nx.from_numpy_array(A)

that has the following nr of nodes:

> nx.number_of_nodes(G)
5084

After I save it:

> nx.write_edgelist(G,'edge_list.nx')

and read again

graph = nx.read_edgelist('edge_list.nx')

I get a different number of nodes:

> nx.number_of_nodes(graph)
5079

Why?

Input numpy array attached.