Jiaming Yuan 6762c45494
Small cleanup to gradient index and hist. (#7668)
* Code comments.
* Const accessor to index.
* Remove some weird variables in the `Index` class.
* Simplify the `MemStackAllocator`.
2022-02-23 11:37:21 +08:00
..
2022-01-10 21:15:05 +08:00
2022-01-10 21:15:05 +08:00