[WIP] Get column matrix from GHistIndex. #7072
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Follow up on #7064 .
Fix training continuation
Close Training continuation with multiple DMatrix objects #6148 .
Fix corner case where
sparse_threshold
is changed during training.Finish the DMatrix refactoring
Close [RFC] Possible DMatrix refactor #4354 .
Close [Roadmap] DMatrix refactoring #5143 .
todos