Jiaming Yuan 5feee8d4a9

Define core multi-target regression tree structure. (#8884) ...

- Define a new tree struct embedded in the `RegTree`.
- Provide dispatching functions in `RegTree`.
- Fix some c++-17 warnings about the use of nodiscard (currently we disable the warning on
  the CI).
- Use uint32_t instead of size_t for `bst_target_t` as it has a defined size and can be used
  as part of dmlc parameter.
- Hide the `Segment` struct inside the categorical split matrix.

2023-03-09 19:03:06 +08:00

..

xgboost

Define core multi-target regression tree structure. (#8884)

2023-03-09 19:03:06 +08:00