AutoTuner should maybe use $predict_type from the tuned learner.

[sebffischer]

I just ran into this that I passed a learner with predict_type "prob" to the AutoTuner, but forgot to set the predict type for the AutoTuner itself. I would argue that it is a better default to set the predict type of the AutoTuner during $initialize() to the predict type of the learner that is being tuned.

[be-marc]

Actually there is a unit test for this. Not sure why it didn't work for you.

mlr3tuning/tests/testthat/test_AutoTuner.R

Lines 37 to 40 in 535c418

	at = AutoTuner$new(tuner, lrn("classif.rpart", predict_type = "prob"), r_inner, ms, te, param_set)
	expect_null(at$tuning_instance)
	expect_equal(at$predict_type, "prob")