Peixian Wang

Is there a blocker for this PR to get upstreamed?

@josevalim I'll change it to counters. For tests, it appears that the tests are by default already broken? I didn't add onto it because I wasn't sure what the state...

@josevalim this is good for re-review, I've got all the tests passing and added a few.

This is an old issue, but in case anyone ends up here like I have, it was an issue of the path for me. Input like ``` node2vec -i:/workspace/org-data.edgelist -o:/workspace/org-data.emb...