[python-package] use 2d collections for predictions, grads and hess in multiclass custom objective#4925

Merged

shiyu1994 merged 7 commits intomasterfrom multiclass-custom-obj

Feb 23, 2022

+143-81

Commits on Jan 4, 2022

reshape predictions, grad and hess in multiclass custom objective
jmoralez
committed

Commits on Jan 6, 2022

add sklearn test. move custom obj to utils. docs for numpy
jmoralez
committed

Commits on Feb 15, 2022

Commits on Feb 17, 2022

update docs and dask multiclass custom objective test
jmoralez
committed

Commits on Feb 23, 2022