mlr_tasks function

Dictionary of Tasks

A simple mlr3misc::Dictionary storing objects of class Task . Each task has an associated help page, see mlr_tasks_[id].

This dictionary can get populated with additional tasks by add-on packages, e.g. list("mlr3data"), list("mlr3proba") or list("mlr3cluster"). list("mlr3oml") allows to interact with OpenML.

For a more convenient way to retrieve and construct tasks, see tsk()/tsks(). data

Format

R6::R6Class object inheriting from mlr3misc::Dictionary .

Methods

See mlr3misc::Dictionary .

S3 methods

• as.data.table(dict, ..., objects = FALSE)

  mlr3misc::Dictionary -> data.table::data.table()

  Returns a data.table::data.table() with columns "key", "label", "task_type", "nrow", "ncol", "properties", and the number of features of type "lgl", "int", "dbl", "chr", "fct" and "ord", respectively. If objects is set to TRUE, the constructed objects are returned in the list column named object.

Examples

as.data.table(mlr_tasks)
task = mlr_tasks$get("penguins") # same as tsk("penguins")
head(task$data())

# Add a new task, based on a subset of penguins:
data = palmerpenguins::penguins
data$species = factor(ifelse(data$species == "Adelie", "1", "0"))
task = TaskClassif$new("penguins.binary", data, target = "species", positive = "1")

# add to dictionary
mlr_tasks$add("penguins.binary", task)

# list available tasks
mlr_tasks$keys()

# retrieve from dictionary
mlr_tasks$get("penguins.binary")

# remove task again
mlr_tasks$remove("penguins.binary")

See Also

Sugar functions: tsk(), tsks()

Extension Packages: list("mlr3data")

Other Dictionary: mlr_learners, mlr_measures, mlr_resamplings, mlr_task_generators

Other Task: Task, TaskClassif, TaskRegr, TaskSupervised, TaskUnsupervised, california_housing, mlr_tasks_breast_cancer, mlr_tasks_german_credit, mlr_tasks_iris, mlr_tasks_mtcars, mlr_tasks_penguins, mlr_tasks_pima, mlr_tasks_sonar, mlr_tasks_spam, mlr_tasks_wine, mlr_tasks_zoo