LearnerSurv: Survival Learner

In mlr3proba: Probabilistic Supervised Learning for 'mlr3'

Survival Learner

Description

This Learner specializes Learner for survival problems:

• task_type is set to "surv"

• Creates Predictions of class PredictionSurv.

• Possible values for predict_types are:

  • "distr": Predicts a probability distribution for each observation in the test set, uses distr6.

  • "lp": Predicts a linear predictor for each observation in the test set.

  • "crank": Predicts a continuous ranking for each observation in the test set.

  • "response": Predicts a survival time for each observation in the test set.

Super class

mlr3::Learner -> LearnerSurv

Methods

Public methods

• LearnerSurv$new()

• LearnerSurv$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

LearnerSurv$new(
  id,
  param_set = ps(),
  predict_types = "distr",
  feature_types = character(),
  properties = character(),
  packages = character(),
  label = NA_character_,
  man = NA_character_
)

Arguments

id

(character(1))
Identifier for the new instance.

param_set

(paradox::ParamSet)
Set of hyperparameters.

predict_types

(character())
Supported predict types. Must be a subset of mlr_reflections$learner_predict_types.

feature_types

(character())
Feature types the learner operates on. Must be a subset of mlr_reflections$task_feature_types.

properties

(character())
Set of properties of the Learner. Must be a subset of mlr_reflections$learner_properties. The following properties are currently standardized and understood by learners in mlr3:

• "missings": The learner can handle missing values in the data.

• "weights": The learner supports observation weights.

• "importance": The learner supports extraction of importance scores, i.e. comes with an $importance() extractor function (see section on optional extractors in Learner).

• "selected_features": The learner supports extraction of the set of selected features, i.e. comes with a $selected_features() extractor function (see section on optional extractors in Learner).

• "oob_error": The learner supports extraction of estimated out of bag error, i.e. comes with a oob_error() extractor function (see section on optional extractors in Learner).

packages

(character())
Set of required packages. A warning is signaled by the constructor if at least one of the packages is not installed, but loaded (not attached) later on-demand via requireNamespace().

label

(character(1))
Label for the new instance.

man

(character(1))
String in the format [pkg]::[topic] pointing to a manual page for this object. The referenced help package can be opened via method $help().

---

Method clone()

The objects of this class are cloneable with this method.

Usage

LearnerSurv$clone(deep = FALSE)

Arguments

deep

Whether to make a deep clone.

See Also

Other Learner: LearnerDens

Examples

library(mlr3)
# get all survival learners from mlr_learners:
lrns = mlr_learners$mget(mlr_learners$keys("^surv"))
names(lrns)

# get a specific learner from mlr_learners:
mlr_learners$get("surv.coxph")
lrn("surv.coxph")

mlr3proba documentation built on April 25, 2022, 5:07 p.m.