Added general unit test for label switching #34
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Added general test case to flag label switching. Tested by training each classifier against a very easy task and comparing raw output from "predict" function.
Didn't use output from
learner$predict(task)
as this wouldn't have picked up #32 (i.e. in that issue,train_internal
was inverting the labels,predict_internal
was inverting the predicted labels back again, only caused issues within the model for xgboost watchlist functionality)