feat: add function to extract information from a model #1213
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learner = lrn("classif.rpart")
task = tsk("iris")
resampling = rsmp("cv", folds = 3)
extractor = function(learner) list(selected_features = setdiff(learner$model$frame$var, "<leaf>"))
rr = resample(task, learner, resampling, extractor = extractor)
rr$learners[[1]]$state$selected_features |
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