Jiaming Yuan 83a66b4994
Support categorical data for hist. (#7695)
* Extract partitioner from hist.
* Implement categorical data support by passing the gradient index directly into the partitioner.
* Organize/update document.
* Remove code for negative hessian.
2022-02-25 03:47:14 +08:00
..
2021-10-20 14:45:30 +08:00