Ranger Regression Learner

Random regression forest. Calls ranger::ranger() from package ranger.

Dictionary

This Learner can be instantiated via the dictionary mlr_learners or with the associated sugar function lrn():

mlr_learners$get("regr.ranger")
lrn("regr.ranger")

References

Breiman, Leo (2001). “Random Forests.” Machine Learning, 45(1), 5--32. ISSN 1573-0565, doi: 10.1023/A:1010933404324 . Wright, N. M, Ziegler, Andreas (2017). “ranger: A Fast Implementation of Random Forests for High Dimensional Data in C++ and R.” Journal of Statistical Software, 77(1), 1--17. doi: 10.18637/jss.v077.i01 .

See also

Dictionary of Learners: mlr3::mlr_learners

Super classes

mlr3::Learner -> mlr3::LearnerRegr -> LearnerRegrRanger

Methods

Public methods

• LearnerRegrRanger$new()

• LearnerRegrRanger$importance()

• LearnerRegrRanger$oob_error()

• LearnerRegrRanger$clone()

Inherited methods

• mlr3::Learner$format()

• mlr3::Learner$help()

• mlr3::Learner$predict()

• mlr3::Learner$predict_newdata()

• mlr3::Learner$print()

• mlr3::Learner$reset()

• mlr3::Learner$train()

---

Method new()

Creates a new instance of this R6 class.

Usage

LearnerRegrRanger$new()

---

Method importance()

The importance scores are extracted from the model slot variable.importance. Parameter importance.mode must be set to "impurity", "impurity_corrected", or "permutation"

Usage

LearnerRegrRanger$importance()

Returns

Named numeric().

---

Method oob_error()

The out-of-bag error, extracted from model slot prediction.error.

Usage

LearnerRegrRanger$oob_error()

Returns

numeric(1).

---

Method clone()

The objects of this class are cloneable with this method.

Usage

LearnerRegrRanger$clone(deep = FALSE)

Arguments

deep

Whether to make a deep clone.

Examples

if (requireNamespace("ranger")) {
  learner = mlr3::lrn("regr.ranger")
  print(learner)

  # available parameters:
learner$param_set$ids()
}
#> <LearnerRegrRanger:regr.ranger>
#> * Model: -
#> * Parameters: list()
#> * Packages: ranger
#> * Predict Type: response
#> * Feature types: logical, integer, numeric, character, factor, ordered
#> * Properties: importance, oob_error, weights
#>  [1] "num.trees"                    "mtry"                        
#>  [3] "importance"                   "write.forest"                
#>  [5] "min.node.size"                "replace"                     
#>  [7] "sample.fraction"              "splitrule"                   
#>  [9] "num.random.splits"            "alpha"                       
#> [11] "minprop"                      "split.select.weights"        
#> [13] "always.split.variables"       "respect.unordered.factors"   
#> [15] "keep.inbag"                   "holdout"                     
#> [17] "num.threads"                  "save.memory"                 
#> [19] "verbose"                      "oob.error"                   
#> [21] "scale.permutation.importance" "max.depth"                   
#> [23] "min.prop"                     "regularization.factor"       
#> [25] "regularization.usedepth"      "seed"                        
#> [27] "quantreg"                     "predict.all"                 
#> [29] "se.method"