# checks for duplicated entries in learner.names and stops
# with error message containing the learner name that appeared more
# than once
checkDuplicatedLearnerNames = function(learner.names) {
dupl = duplicated(learner.names)
if (any(dupl)) {
dupl.learners = unique(learner.names[dupl])
stopf("Learner short names are not unique for: %s. \n Set 'pretty.names = FALSE' to resolve this.",
collapse(dupl.learners))
}
}
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