Jiaming Yuan 96f8843694
[backport] CI fixes (#6933)
* Relax shotgun test. (#6900)

It's non-deterministic algorithm, the test is flaky.

* Disable pylint error. (#6911)

* [CI] Skip external memory gtest on osx. (#6901)

* [CI] Fix custom metric test with empty dataset. (#6917)

* Reduce Travis environment setup time. (#6912)

* Remove unused r from travis.
* Don't update homebrew.
* Don't install indirect/unused dependencies like libgit2, wget, openssl.
* Move graphviz installation to conda.

* Relax shotgun test. (#6918)

* Relax test for decision stump in distributed environment. (#6919)

* Backport cupy fix.
2021-05-03 21:30:26 +08:00
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2021-05-03 21:30:26 +08:00