Gradient Boosting with Regression Trees Survival Learner

Calls mboost::blackboost().

• lp is predicted by mboost::predict.mboost()

• distr is predicted by mboost::survFit() which assumes a PH fit with a Breslow estimator

• crank is identical to lp

The dist parameter is specified slightly differently than in mboost. Whereas the latter takes in objects, in this learner instead a string is specified in order to identify which distribution to use. As the default in mboost is the Gaussian family, which is not compatible with survival models, instead we have by default "coxph".

If the value given to the Family parameter is "custom.family" then an object of class mboost::Family() needs to be passed to the custom.family parameter.

Dictionary

This Learner can be instantiated via the dictionary mlr_learners or with the associated sugar function lrn():

LearnerSurvBlackboost$new()
mlr_learners$get("surv.blackboost")
lrn("surv.blackboost")

Meta Information

• Type: "surv"

• Predict Types: distr, crank, lp, response

• Feature Types: integer, numeric, factor

• Properties: weights

• Packages: mboost distr6 survival partykit mvtnorm

References

Bühlmann P, Hothorn T (2007). “Boosting Algorithms: Regularization, Prediction and Model Fitting.” Statistical Science, 22(4), 477--505. doi: 10.1214/07-sts242 .

Hothorn T, Hornik K, Zeileis A (2006). “Unbiased Recursive Partitioning: A Conditional Inference Framework.” Journal of Computational and Graphical Statistics, 15(3), 651--674. doi: 10.1198/106186006x133933 .

Freund Y, Schapire RE, others (1996). “Experiments with a new boosting algorithm.” In In: Thirteenth International Conference on ML, volume 96, 148--156. Citeseer.

Friedman JH (2001). “Greedy Function Approximation: A Gradient Boosting Machine.” The Annals of Statistics, 29(5), 1189--1232. http://www.jstor.org/stable/2699986.

Ridgeway G (1999). “The state of boosting.” Computing Science and Statistics, 172--181.

See also

Other survival learners: LearnerSurvCVGlmnet, LearnerSurvCoxPH, LearnerSurvGBM, LearnerSurvGamboost, LearnerSurvGlmboost, LearnerSurvGlmnet, LearnerSurvKaplan, LearnerSurvMboost, LearnerSurvRanger, LearnerSurvRpart, LearnerSurvXgboost

Super classes

mlr3::Learner -> mlr3proba::LearnerSurv -> LearnerSurvBlackboost

Methods

Public methods

• LearnerSurvBlackboost$new()

• LearnerSurvBlackboost$clone()

Inherited methods

• mlr3::Learner$format()

• mlr3::Learner$help()

• mlr3::Learner$predict()

• mlr3::Learner$predict_newdata()

• mlr3::Learner$print()

• mlr3::Learner$reset()

• mlr3::Learner$train()

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Method new()

Creates a new instance of this R6 class.

Usage

LearnerSurvBlackboost$new()

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Method clone()

The objects of this class are cloneable with this method.

Usage

LearnerSurvBlackboost$clone(deep = FALSE)

Arguments

deep

Whether to make a deep clone.

Examples

library(mlr3)
task = tgen("simsurv")$generate(20)
learner = lrn("surv.blackboost")
resampling = rsmp("cv", folds = 2)
resample(task, learner, resampling)
#> <ResampleResult> of 2 iterations
#> * Task: simsurv
#> * Learner: surv.blackboost
#> * Warnings: 0 in 0 iterations
#> * Errors: 0 in 0 iterations