GitLab

* Update dataset_loader.cpp

* Update gbdt.h

* Update regression_objective.hpp

* Update linker_topo.cpp

* Update xentropy_objective.hpp

* Update regression_objective.hpp

* investigate inf test failure

* avoid overflow in regression objective

* remove `test_inf_handle` test
Co-authored-by: Guolin Ke <guolin.ke@outlook.com>