libSVM data problem

[zyzhong]

LightGBM print log, "[LightGBM] #data:18269614 #feature:43".
The datas have 44 dimensions started with 0, why the log says #feature:43? It's something wrong?

[guolinke]

LightGBM will ignore features that (almost) all are same values(like all zeros). That features cannot be used for splitting data, so we don't need to store them.

[github-actions]

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