Jiaming Yuan 6295dc3b67

Fix span reverse iterator. (#7387) ...

* Fix span reverse iterator.

* Disable `rbegin` on device code to avoid calling host function.
* Add `trbegin` and friends.

2021-11-02 13:35:59 +08:00

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xgboost

Fix span reverse iterator. (#7387)

2021-11-02 13:35:59 +08:00