[POC] Multi target tree. #5460
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[POC] Multi target tree. #5460
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This was referenced Apr 1, 2020
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Partly extracted from dmlc#5460. * Fix GPU Hist feature importance.
This was referenced Apr 14, 2020
* Added a new exact tree method. * Specialize many utilities for it.
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This is only a proof of concept implementation for exact tree method. For anything real we still have a long way to go.
Please ignore all changes in colmaker, it's not intended to be part of final PR.
@RAMitchell @hcho3