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2 Commits

Author SHA1 Message Date
Jiaming Yuan
29b7fea572
Optimize cpu sketch allreduce for sparse data. (#6009) 
* Bypass RABIT serialization reducer and use custom allgather based merging.
 2020-08-19 10:03:45 +08:00
Jiaming Yuan
ee70a2380b
Unify CPU hist sketching (#5880) 2020-08-12 01:33:06 +08:00