mlr3 (version 0.3.0)

mlr_sugar: Syntactic Sugar for Object Construction

Description

Functions to retrieve objects, set hyperparameters and assign to fields in one go. Relies on mlr3misc::dictionary_sugar_get() to extract objects from the respective mlr3misc::Dictionary:

• tsk() for a Task from mlr_tasks.

• tsks() for a list of Tasks from mlr_tasks.

• tgen() for a TaskGenerator from mlr_task_generators.

• tgens() for a list of TaskGenerators from mlr_task_generators.

• lrn() for a Learner from mlr_learners.

• lrns() for a list of Learners from mlr_learners.

• rsmp() for a Resampling from mlr_resamplings.

• rsmps() for a list of Resamplings from mlr_resamplings.

• msr() for a Measure from mlr_measures.

• msrs() for a list of Measures from mlr_measures.

Usage

tsk(.key, ...)
tsks(.keys, ...)
tgen(.key, ...)
tgens(.keys, ...)
lrn(.key, ...)
lrns(.keys, ...)
rsmp(.key, ...)
rsmps(.keys, ...)
msr(.key, ...)
msrs(.keys, ...)

Arguments

.key

(character(1)) Key passed to the respective dictionary to retrieve the object.

...

(named list()) Named arguments passed to the constructor, to be set as parameters in the paradox::ParamSet, or to be set as public field. See mlr3misc::dictionary_sugar_get() for more details.

.keys

(character()) Keys passed to the respective dictionary to retrieve multiple objects.

Value

R6::R6Class object of the respective type, or a list of R6::R6Class objects for the plural versions.

Examples

# NOT RUN {
# iris task with new id
tsk("iris", id = "iris2")

# classification tree with different hyperparameters
# and predict type set to predict probabilities
lrn("classif.rpart", cp = 0.1, predict_type = "prob")

# multiple learners with predict type 'prob'
lapply(c("classif.featureless", "classif.rpart"), lrn, predict_type = "prob")
# }