[CI] Fix custom metric test with empty dataset. #6917
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hcho3
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RAMitchell
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trivialfis
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trivialfis
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* 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.
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In numpy
1.20.2, for an empty arraypredtwith shape[], the comparison ofpredt < 0.5returns a 2-dim array with shape(0, 1). This causes later indexing error.