xgboost

Author	SHA1	Message	Date
Jiaming Yuan	972730cde0	Use matrix for gradient. (#9508 ) - Use the `linalg::Matrix` for storing gradients. - New API for the custom objective. - Custom objective for multi-class/multi-target is now required to return the correct shape. - Custom objective for Python can accept arrays with any strides. (row-major, column-major)	2023-08-24 05:29:52 +08:00
Jiaming Yuan	151882dd26	Initial support for multi-target tree. (#8616 ) * Implement multi-target for hist. - Add new hist tree builder. - Move data fetchers for tests. - Dispatch function calls in gbm base on the tree type.	2023-03-22 23:49:56 +08:00
Jiaming Yuan	2aa838c75e	Define multi-strategy parameter. (#8890 )	2023-03-11 02:58:01 +08:00
Jiaming Yuan	cfa994d57f	Multi-target support for L1 error. (#8652 ) - Add matrix support to the median function. - Iterate through each target for quantile computation.	2023-01-11 05:51:14 +08:00