mlr.learners$add(LearnerClassif$new(
name = "rpart",
package = "rpart",
par.set = ParamSetFlat$new(
params = list(
ParamInt$new(id = "minsplit", default = 20L, lower = 1L),
ParamReal$new(id = "cp", default = 0.01, lower = 0, upper = 1),
ParamInt$new(id = "maxcompete", default = 4L, lower = 0L),
ParamInt$new(id = "maxsurrogate", default = 5L, lower = 0L),
ParamFactor$new(id = "usesurrogate", default = 2L, values = 0:2),
ParamFactor$new(id = "surrogatestyle", default = 0L, values = 0:1),
ParamInt$new(id = "maxdepth", default = 30L, lower = 1L, upper = 30L), # we use 30 as upper limit, see docs of rpart.control
ParamInt$new(id = "xval", default = 10L, lower = 0L)
)
),
par.vals = list(),
properties = c("twoclass", "multiclass", "missings", "feat.numeric", "feat.factor", "feat.ordered", "prob", "weights", "featimp", "formula"),
train = function(task, subset, ...) {
data = getTaskData(task, subset = subset, type = "train", props = self$properties)
rpart::rpart(task$formula, data, ...)
},
predict = function(model, newdata, ...) {
pt = self$predict.type
if (pt == "response")
as.character(predict(model$rmodel, newdata = newdata, type = "class", ...))
else
predict(model$rmodel, newdata = newdata, type = "prob", ...)
},
# FIXME: can be removed, was just for testing
model.extractors = list(residuals = function(model, task, subset, type = "usual", ...) {
type = assertSubset(type, choices = c("usual", "pearson", "deviance"))
rpart:::residuals.rpart(model, type = type, ...)
})
))
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