Classification SimpleLogistic Learner

LogitBoost with simple regression functions as base learners. Calls RWeka::make_Weka_classifier() from RWeka.

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

• 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 lrn():

lrn("classif.simple_logistic")

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	-		-
I	integer	-		\((-\infty, \infty)\)
S	logical	FALSE	TRUE, FALSE	-
P	logical	FALSE	TRUE, FALSE	-
M	integer	-		\((-\infty, \infty)\)
H	integer	50		\((-\infty, \infty)\)
W	numeric	0		\((-\infty, \infty)\)
A	logical	FALSE	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		\([1, \infty)\)
options	untyped	NULL		-

References

Landwehr, Niels, Hall, Mark, Frank, Eibe (2005). “Logistic model trees.” Machine learning, 59(1), 161–205.

Sumner M, Frank E, Hall M (2005). “Speeding up Logistic Model Tree Induction.” In 9th European Conference on Principles and Practice of Knowledge Discovery in Databases, 675-683.

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 -> LearnerClassifSimpleLogistic

Active bindings

marshaled

(logical(1))
Whether the learner has been marshaled.

Methods

Public methods

• LearnerClassifSimpleLogistic$new()

• LearnerClassifSimpleLogistic$marshal()

• LearnerClassifSimpleLogistic$unmarshal()

• LearnerClassifSimpleLogistic$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$train()
• mlr3::LearnerClassif$predict_newdata_fast()

---

Method new()

Creates a new instance of this R6 class.

Usage

LearnerClassifSimpleLogistic$new()

---

Method marshal()

Marshal the learner's model.

Usage

LearnerClassifSimpleLogistic$marshal(...)

Arguments

...

(any)
Additional arguments passed to mlr3::marshal_model().

---

Method unmarshal()

Unmarshal the learner's model.

Usage

LearnerClassifSimpleLogistic$unmarshal(...)

Arguments

...

(any)
Additional arguments passed to mlr3::unmarshal_model().

---

Method clone()

The objects of this class are cloneable with this method.

Usage

LearnerClassifSimpleLogistic$clone(deep = FALSE)

Arguments

deep

Whether to make a deep clone.

Examples

# Define the Learner
learner = lrn("classif.simple_logistic")
print(learner)
#> 
#> ── <LearnerClassifSimpleLogistic> (classif.simple_logistic): LogitBoost Based Lo
#> • Model: -
#> • Parameters: list()
#> • Packages: mlr3 and RWeka
#> • Predict Types: [response] and prob
#> • Feature Types: logical, integer, numeric, factor, and ordered
#> • Encapsulation: none (fallback: -)
#> • Properties: marshal, missings, multiclass, and twoclass
#> • Other settings: use_weights = 'error'

# Define a Task
task = tsk("sonar")

# Create train and test set
ids = partition(task)

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

print(learner$model)
#> SimpleLogistic:
#> 
#> Class M :
#> -3.83 + 
#> [V10] * 1.42 +
#> [V11] * 3.8  +
#> [V16] * -0.79 +
#> [V2] * 7.38 +
#> [V23] * 2.27 +
#> [V28] * 0.72 +
#> [V34] * -0.96 +
#> [V36] * -1.08 +
#> [V4] * 4.5  +
#> [V44] * 1.71 +
#> [V45] * 2.32 +
#> [V52] * 59.7 +
#> [V56] * 30.85 +
#> [V7] * -2.76
#> 
#> Class R :
#> 3.83 + 
#> [V10] * -1.42 +
#> [V11] * -3.8 +
#> [V16] * 0.79 +
#> [V2] * -7.38 +
#> [V23] * -2.27 +
#> [V28] * -0.72 +
#> [V34] * 0.96 +
#> [V36] * 1.08 +
#> [V4] * -4.5 +
#> [V44] * -1.71 +
#> [V45] * -2.32 +
#> [V52] * -59.7 +
#> [V56] * -30.85 +
#> [V7] * 2.76
#> 


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

# Score the predictions
predictions$score()
#> classif.ce 
#>  0.4057971