Zero Embedding Vector Issue for LINE

[pangbochen]

Hi, I found in the output embedding file, some item embeddings are all zero.

I guess maybe it caused by the random sample strategy, for with random in the same seed, around 1/e will never be sampled. But the all-zero ratio is less than 1/e.
Another assumption is the SGD update to some hot node.

So I wonder if the epoch-version will help to solve this question.

[pangbochen]

fix, long long and int issue for huge graph edgelist files