Oblique Random Forest Regressor

Accelerated oblique random regression forest. Calls aorsf::orsf() from aorsf.

Initial parameter values

• n_thread: This parameter is initialized to 1 (default is 0) to avoid conflicts with the mlr3 parallelization.

• pred_simplify has to be TRUE, otherwise response is NA in prediction

See also

• Dictionary of Learners: mlr3::mlr_learners.

• as.data.table(mlr_learners) for a table of available Learners in the running session (depending on the loaded packages).

• Chapter in the mlr3book: https://mlr3book.mlr-org.com/basics.html#learners

• mlr3learners for a selection of recommended learners.

• mlr3cluster for unsupervised clustering learners.

• mlr3pipelines to combine learners with pre- and postprocessing steps.

• mlr3tuning for tuning of hyperparameters, mlr3tuningspaces for established default tuning spaces.

Author

annanzrv

Super classes

mlr3::Learner -> mlr3::LearnerRegr -> LearnerRegrObliqueRandomForest

Methods

Public methods

• LearnerRegrObliqueRandomForest$new()

• LearnerRegrObliqueRandomForest$oob_error()

• LearnerRegrObliqueRandomForest$importance()

• LearnerRegrObliqueRandomForest$clone()

Inherited methods

• mlr3::Learner$base_learner()
• mlr3::Learner$configure()
• mlr3::Learner$encapsulate()
• mlr3::Learner$format()
• mlr3::Learner$help()
• mlr3::Learner$predict()
• mlr3::Learner$predict_newdata()
• mlr3::Learner$print()
• mlr3::Learner$reset()
• mlr3::Learner$selected_features()
• mlr3::Learner$train()

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Method new()

Creates a new instance of this R6 class.

Usage

LearnerRegrObliqueRandomForest$new()

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Method oob_error()

OOB concordance error extracted from the model slot eval_oobag$stat_values

Usage

LearnerRegrObliqueRandomForest$oob_error()

Returns

numeric().

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Method importance()

The importance scores are extracted from the model.

Usage

LearnerRegrObliqueRandomForest$importance()

Returns

Named numeric().

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Method clone()

The objects of this class are cloneable with this method.

Usage

LearnerRegrObliqueRandomForest$clone(deep = FALSE)

Arguments

deep

Whether to make a deep clone.

Examples

# Define the Learner
learner = mlr3::lrn("regr.aorsf", importance = "anova")
print(learner)
#> <LearnerRegrObliqueRandomForest:regr.aorsf>: Oblique Random Forest Regressor
#> * Model: -
#> * Parameters: importance=anova, n_thread=1
#> * Packages: mlr3, mlr3extralearners, aorsf
#> * Predict Types:  [response]
#> * Feature Types: logical, integer, numeric, factor, ordered
#> * Properties: importance, oob_error, weights

# Define a Task
task = mlr3::tsk("mtcars")
# Create train and test set
ids = mlr3::partition(task)

# Train the learner on the training ids
learner$train(task, row_ids = ids$train)

print(learner$model)
#> ---------- Oblique random regression forest
#> 
#>      Linear combinations: Linear regression
#>           N observations: 21
#>                  N trees: 500
#>       N predictors total: 10
#>    N predictors per node: 4
#>  Average leaves per tree: 3.296
#> Min observations in leaf: 5
#>           OOB stat value: 0.70
#>            OOB stat type: RSQ
#>      Variable importance: anova
#> 
#> -----------------------------------------
print(learner$importance())
#>          wt        carb          am          hp        disp         cyl 
#> 0.136363636 0.104225352 0.066666667 0.053908356 0.041994751 0.040880503 
#>        drat        qsec        gear          vs 
#> 0.027322404 0.010075567 0.002898551 0.000000000 

# Make predictions for the test rows
predictions = learner$predict(task, row_ids = ids$test)

# Score the predictions
predictions$score()
#> regr.mse 
#> 9.576405