exact tree training does not seem to colsample bynode
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Description
https://github.com/dmlc/xgboost/blob/master/src/tree/updater_colmaker.cc#L477
FindSplit() enumerates all splits of all nodes in the same depth in parallel. In this function, `column_sampler_->GetFeatureSet(depth);` is only called once at the beginning. Then, wouldn't it use the same set of features per depth?
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