Classification Linear Discriminant Analysis Learner

Shrinkage-based Diagonal Linear Discriminant Analysis classfier. Type of Naive Bayes classifiers that improves the estimation of the pooled variances by using a shrinkage-based estimator of the pooled covariance matrix. Calls sparsediscrim::lda_shrink_cov() sparsediscrim.

Dictionary

This Learner can be instantiated via lrn():

lrn("classif.sdlda")

Meta Information

• Task type: “classif”

• Predict Types: “response”, “prob”

• Feature Types: “integer”, “numeric”

• Required Packages: mlr3, sparsediscrim

Parameters

Id	Type	Default	Range
num_alphas	integer	101	\((-\infty, \infty)\)
prior	untyped	NULL	-

References

Pang H, Tong T, Zhao H (2009). “Shrinkage-Based Diagonal Discriminant Analysis and Its Applications in High-Dimensional Data.” Biometrics, 65(4), 1021–1029. ISSN 0006341X, 15410420, http://www.jstor.org/stable/20640622.

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::LearnerClassif -> LearnerClassifSdlda

Methods

Public methods

• LearnerClassifSdlda$new()

• LearnerClassifSdlda$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()

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Method new()

Creates a new instance of this R6 class.

Usage

LearnerClassifSdlda$new()

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Method clone()

The objects of this class are cloneable with this method.

Usage

LearnerClassifSdlda$clone(deep = FALSE)

Arguments

deep

Whether to make a deep clone.

Examples

# Define the Learner
learner = lrn("classif.sdlda")
print(learner)
#> 
#> ── <LearnerClassifSdlda> (classif.sdlda): Shrinkage-based Diagonal Linear Discri
#> • Model: -
#> • Parameters: list()
#> • Packages: mlr3 and sparsediscrim
#> • Predict Types: [response] and prob
#> • Feature Types: integer and numeric
#> • Encapsulation: none (fallback: -)
#> • Properties: 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)
#> Shrinkage-based Diagonal LDA
#> 
#> Sample Size: 139 
#> Number of Features: 60 
#> 
#> Classes and Prior Probabilities:
#>   M (56.83%), R (43.17%) 


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

# Score the predictions
predictions$score()
#> classif.ce 
#>  0.4637681