todo-files/RLearner_classif_linDA.R

In berndbischl/mlr: Machine Learning in R

#' @export
makeRLearner.classif.linDA = function() {
  makeRLearnerClassif(
    cl = "classif.linDA",
    package = "DiscriMiner",
    par.set = makeParamSet(
      # makeNumericVectorLearnerParam(id = "prior", lower = 0, upper = 1, default = NULL),
      makeDiscreteLearnerParam(id = "validation", values = list(crossval = "crossval", learntest = "learntest", NULL = NULL), default = NULL, tunable = FALSE)
    ),
    properties = c("twoclass", "multiclass", "numerics"),
    name = "Linear Discriminant Analysis",
    short.name = "linda",
    note = "Set `validation = NULL` by default to disable internal test set validation.",
    callees = c("linDA", "classify")
  )
}

#' @export
trainLearner.classif.linDA = function(.learner, .task, .subset, .weights = NULL, ...) {
  d = getTaskData(.task, .subset, target.extra = TRUE, recode.target = "drop.levels")
  DiscriMiner::linDA(variables = d$data, group = d$target, ...)
}

#' @export
predictLearner.classif.linDA = function(.learner, .model, .newdata, ...) {
  m = .model$learner.model
  p = DiscriMiner::classify(m, newdata = .newdata)
  # p$scores #we loose this information
  p$pred_class
}