GitLab

* dowgrade gcc version on Azure

* small fixes, update Artifacts condition for easy debug.

* Update CMakeLists.txt

* Update CMakeLists.txt

* Update CMakeLists.txt

* Update setup.sh

* Update CMakeLists.txt

* Update .vsts-ci.yml

* Update CMakeLists.txt

* remove the lgamma

* update comment

* make sure that we use appropriate compiler

* copy old Booster's attributes to new one in refit method

* fixed according to review comment

* raise error in case of null objective

* fix indices type in csr and csc

* fix

* add indexs in shuffle model.

* fix pep

* fix bug

* fixed FutureWarning about cv default value

* fixed according to new check_estimator API

* fixed joblib warning

* break extremely large lines in basic.py

* break extremely large lines in callback.py

* break extremely large lines in engine.py

* break extremely large lines in sklearn.py

* hotfixes

* unified references

* fixed typo

* GPU version is quite stable now

* updated reference for GPU version

* Enforce R-package dependencies in build_r.R before compilation begins

* Greatly simplify the previous commit

* Fix #1693

* Fix spacing

* Fr -> For

* Recursive causes error on strict R environments

* added sklearn splitter classes in cv function

* added tests

* run pytest for docs folder too

* fixed pylint error and some minor style issues

* using different version for master branch with release

* Update .travis.yml

* Update .travis.yml

* Update VERSION.txt

* Update DESCRIPTION

* Update .appveyor.yml

* Update .appveyor.yml

* Update DESCRIPTION

* Update VERSION.txt

* Update .appveyor.yml

* Update DESCRIPTION

* Update VERSION.txt

* Update DESCRIPTION

* Update GPU-Targets.rst

Fix some inaccurate information in docs

* fix travisCI warning

* fix typos

* update config.h

* reorganized CI files

* merged scripts into one

* refined macos tests

* hotfix

* use the same naming for env variables

* refined Travis tests

* refined VSTS Linux part

* cleanup

* added possibility to test Clang at VSTS

* simplified cp command

* refined Appveyor

* run all tests at Appveyor

* refined VSTS Windows part

* return back old MinGW version

* fixed weird MinGW bug

* don't test Python 3.7 at Windows

* disable tree rendering at Appveyor

* give names to scripts in VSTS Windows and artifacts parts

* warning on categorical feature with sparse values

* [docs] categorical features note

* fix RF's bug withMAPE

* simplify rf's code & support multi-class rf

* fix bug & add test

* add more tests

* Update test_engine.py

* Update test_engine.py

* renamed functions

* updated find_lib function

* [R-package] removed horizontal whitespace (fixes #1642)

* [R-package] fixed missing newline in test file