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[docs] Improve docs: fix consistency of dots in C API and add notes about new ``time-costs`` Python-package build option (#5554)

* Auto-update configure
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[ci] prefer CPython in Windows test environment and use safer approach for cleaning up network (fixes #5509) (#5510)

remove redundant whitespaces

* add multiclass objective for cuda_exp

* remove debug code

* add includes requested by lint checks

* fix compilation failure for cuda with cuda-9.0

* clean code

* add feature interaction constraint for cuda_exp

* test feature interaction constraints for cuda_exp

* remove useless check

* update comment

* change percentile in CUDARegressionL1loss::BoostFromScore to 0.5