Drop zero columns in DGL sparse matrix

Questions
#1

I want to ask if it is possible to drop zero columns of a dgl sparse matrix. I do not think there is some built function but is there any way to do it?

Thanks in advance!

#2

Hi @ShuaiWang97, DGL sparse currently does not support this functionality. But there is a workaround. First, you can get the CSC (indptr and indices) of a DGL sparse matrix. Then you can utilize indptr.diff() to calculate the in-degree of each node and filter those nodes with zero in-degree. Finally you can call cumsum() to get the correct indptr. Notice that the column IDs is changed during the process. You may need to maintain those IDs by yourself.

#3

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