Building Blocks
Task	Task Class
Learner	Learner Class
Measure	Measure Class
Resampling	Resampling Class
Prediction	Abstract Prediction Object
Data Backends
DataBackend	DataBackend
DataBackendDataTable	DataBackend for data.table
DataBackendMatrix	DataBackend for Matrix
as_data_backend()	Create a Data Backend
Classification
TaskClassif	Classification Task
LearnerClassif	Classification Learner
MeasureClassif	Classification Measure
PredictionClassif	Prediction Object for Classification
Regression
TaskRegr	Regression Task
LearnerRegr	Regression Learner
MeasureRegr	Regression Measure
PredictionRegr	Prediction Object for Regression
Tasks
mlr_tasks	Dictionary of Tasks
mlr_tasks_boston_housing	Boston Housing Regression Task
mlr_tasks_german_credit	German Credit Classification Task
mlr_tasks_iris	Iris Classification Task
mlr_tasks_mtcars	"Motor Trend" Car Road Tests Task
mlr_tasks_pima	Pima Indian Diabetes Classification Task
mlr_tasks_sonar	Sonar Classification Task
mlr_tasks_spam	Spam Classification Task
mlr_tasks_wine	Wine Classification Task
mlr_tasks_zoo	Zoo Classification Task
Generators
Generator	Generator Class
Generator2DNormals	2d Normals Classification Task Generator
GeneratorFriedman1	Friedman1 Regression Task Generator
GeneratorSmiley	Smiley Classification Task Generator
GeneratorXor	XOR Classification Task Generator
mlr_generators	Dictionary of Task Generators
Learners
LearnerClassifDebug	Classification Learner for Debugging
LearnerClassifFeatureless	Featureless Classification Learner
LearnerClassifRpart	Classification Tree Learner
LearnerRegrFeatureless	Featureless Regression Learner
LearnerRegrRpart	Regression Tree Learner
mlr_learners	Dictionary of Learners
Measures
MeasureClassifACC	Accuracy Classification Measure
MeasureClassifAUC	Area Under the Curve Classification Measure
MeasureClassifCE	Classification Error Measure
MeasureClassifConfusion confusion_measures()	Binary Classification Measures Derived from a Confusion Matrix
MeasureClassifCosts	Cost-sensitive Classification Measure
MeasureClassifF1	F1 Classification Measure
MeasureElapsedTime	Elapsed Time Measure
MeasureOOBError	Out-of-bag Error Measure
MeasureRegrMAE	Absolute Errors Regression Measure
MeasureRegrMSE	Mean Squared Error Regression Measure
MeasureRegrRMSE	Root Mean Squared Error Regression Measure
MeasureSelectedFeatures	Selected Features Measure
mlr_measures	Dictionary of Performance Measures
Resampling Strategies
ResamplingBootstrap	Bootstrap Resampling
ResamplingCV	Cross Validation Resampling
ResamplingCustom	Custom Resampling
ResamplingHoldout	Holdout Resampling
ResamplingRepeatedCV	Repeated Cross Validation Resampling
ResamplingSubsampling	Subsampling Resampling
mlr_resamplings	Dictionary of Resampling Strategies
Resample
resample()	Resample a Learner on a Task
ResampleResult	Container for Results of resample()
Benchmarking
benchmark()	Benchmark Multiple Learners on Multiple Tasks
expand_grid()	Generate a Benchmark Design
BenchmarkResult	Container for Results of benchmark()
Reflections
mlr_reflections	Reflections for mlr3
Error Handling
mlr_control()	Execution Control Object