Philip Hyunsu Cho 5fc5ec539d Implement robust regularization in 'survival:aft' objective (#5473) ...

* Robust regularization of AFT gradient and hessian

* Fix AFT doc; expose it to tutorial TOC

* Apply robust regularization to uncensored case too

* Revise unit test slightly

* Fix lint

* Update test_survival.py

* Use GradientPairPrecise

* Remove unused variables

2020-04-04 12:21:24 -07:00

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