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# In the following we have the functions
# - getReampleExtract2: Returns a feasible function we can use as extract in resample() for each specific learner class.
# All is handled recursively because we have wrapped learners.
# getResampleExtract2 returns a list of all applicable functions
#
# - getResampleExtract converts the list of functions obtained by getResampleExtract2 to a single function which returns a list of each function result.
getResampleExtract2 = function(learner) {
UseMethod("getResampleExtract2")
}
getResampleExtract2.default = function(learner) {
stopf("Wrapper without underlying Learner.")
}
getResampleExtract2.Learner = function(learner) {
NULL
}
getResampleExtract2.BaseWrapper = function(learner) {
getResampleExtract2(learner$next.learner)
}
getResampleExtract2.TuneWrapper = function(learner) {
c(list(TuneResult = getTuneResult), getResampleExtract2(learner$next.learner))
}
getResampleExtract2.FeatSelWrapper = function(learner) {
c(list(FeatSelResult = getFeatSelResult), getResampleExtract2(learner$next.learner))
}
getResampleExtract2.FilterWrapper = function(learner) {
c(list(FilteredFeatures = getFilteredFeatures), getResampleExtract2(learner$next.learner))
}
getResampleExtract = function(learner) {
functions = getResampleExtract2(learner)
function(x) {
if (length(functions) == 1L) {
functions[[1L]](x)
} else {
lapply(functions, function(fun) fun(x))
}
}
}
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