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I also have this question

So, what is @? It is so amazing!

Very good solution!

data spliting is easy. You have to read paper for details.

Thanks!

actually, it means we should give more attention to non-zero element in adjacent matrix

I don't find the answer from the paper recommended. All I said is my guess! Supposeweight of zeros element loss is 1, weight of non-zeros element is norm .