More tests for column split and vertical federated learning #8985
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Added some more tests for the learner and fit_stump, for both column-wise distributed learning and vertical federated learning.
Also moved the
IsRowSplit
andIsColumnSplit
methods from theDMatrix
to theMetaInfo
since in some places we only have access to theMetaInfo
. Added a new convenience methodIsVerticalFederatedLearning
.Some refactoring of the testing fixtures.