Classification Decision Table Learner

Simple Decision Table majority classifier. Calls RWeka::make_Weka_classifier() from RWeka.

Initial parameter values

• E:

  • Has only 2 out of 4 original evaluation measures : acc and auc with acc being the default

  • Reason for change: this learner should only contain evaluation measures appropriate for classification tasks

Custom mlr3 parameters

• output_debug_info:

  • original id: output-debug-info

• do_not_check_capabilities:

  • original id: do-not-check-capabilities

• num_decimal_places:

  • original id: num-decimal-places

• batch_size:

  • original id: batch-size

• P_best:

  • original id: P

• D_best:

  • original id: D

• N_best:

  • original id: N

• S_best:

  • original id: S

• Reason for change: This learner contains changed ids of the following control arguments since their ids contain irregular pattern

Dictionary

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

mlr_learners$get("classif.decision_table")
lrn("classif.decision_table")

Meta Information

• Task type: “classif”

• Predict Types: “response”, “prob”

• Feature Types: “logical”, “integer”, “numeric”, “factor”, “ordered”

• Required Packages: mlr3, RWeka

Parameters

Id	Type	Default	Levels	Range
subset	untyped	-		-
na.action	untyped	-		-
S	character	BestFirst	BestFirst, GreedyStepwise	-
X	integer	1		\((-\infty, \infty)\)
E	character	acc	acc, auc	-
I	logical	-	TRUE, FALSE	-
R	logical	-	TRUE, FALSE	-
output_debug_info	logical	FALSE	TRUE, FALSE	-
do_not_check_capabilities	logical	FALSE	TRUE, FALSE	-
num_decimal_places	integer	2		\([1, \infty)\)
batch_size	integer	100		\([1, \infty)\)
P_best	untyped	-		-
D_best	character	1	0, 1, 2	-
N_best	integer	-		\((-\infty, \infty)\)
S_best	integer	1		\((-\infty, \infty)\)
options	untyped	NULL		-

References

Kohavi R (1995). “The Power of Decision Tables.” In 8th European Conference on Machine Learning, 174--189.

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

damirpolat

Super classes

mlr3::Learner -> mlr3::LearnerClassif -> LearnerClassifDecisionTable

Methods

Public methods

• LearnerClassifDecisionTable$new()

• LearnerClassifDecisionTable$clone()

Inherited methods

• mlr3::Learner$base_learner()
• mlr3::Learner$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

LearnerClassifDecisionTable$new()

---

Method clone()

The objects of this class are cloneable with this method.

Usage

LearnerClassifDecisionTable$clone(deep = FALSE)

Arguments

deep

Whether to make a deep clone.

Examples

learner = mlr3::lrn("classif.decision_table")
print(learner)
#> <LearnerClassifDecisionTable:classif.decision_table>: Decision Table
#> * Model: -
#> * Parameters: E=acc
#> * Packages: mlr3, RWeka
#> * Predict Types:  [response], prob
#> * Feature Types: logical, integer, numeric, factor, ordered
#> * Properties: missings, multiclass, twoclass

# available parameters:
learner$param_set$ids()
#>  [1] "subset"                    "na.action"                
#>  [3] "S"                         "X"                        
#>  [5] "E"                         "I"                        
#>  [7] "R"                         "output_debug_info"        
#>  [9] "do_not_check_capabilities" "num_decimal_places"       
#> [11] "batch_size"                "P_best"                   
#> [13] "D_best"                    "N_best"                   
#> [15] "S_best"                    "options"