Issues

• Learner trained on old mlr3 version silently fails predict with Mlr3ErrorTimeout instead of a version-mismatch error

  mlr-org/mlr3#1516 · Filter by author EkaterinaKhadonova opened on Sep 29, 2026

• $extra field of Prediction[Data] appears to not be documented

  mlr-org/mlr3#1489 · Filter by author mb706 opened on Jul 13, 2026

• Possibility to react to changes in mlr_reflections

  Priority: LowStatus: Discussion Needed
  mlr-org/mlr3#1474 · Filter by author mb706 opened on Apr 29, 2026

• Add option to task$data() to return all columns of the backend

  mlr-org/mlr3#1470 · Filter by author be-marc opened on Apr 20, 2026

• filter_prediction_data.PredictionDataRegr doesn't update distributions

  Type: Bug
  mlr-org/mlr3#1400 · Filter by author wmay opened on Sep 24, 2025
  1

• Internal tuning should be even easier to configure

  Type: Documentation
  mlr-org/mlr3#1386 · Filter by author sebffischer opened on Aug 26, 2025
  2

• Reduce serialization in mirai_map

  Type: Enhancement
  mlr-org/mlr3#1374 · Filter by author be-marc opened on Aug 14, 2025
  

• General base class for mlr3 classes

  Status: In ProgressWorkshop
  mlr-org/mlr3#1354 · Filter by author mb706 opened on Aug 9, 2025
  

• Do we really need distr prediction type in PredictionRegr?

  Status: Discussion Needed
  mlr-org/mlr3#1325 · Filter by author bblodfon opened on Jun 26, 2025
  14

• mlr3 presentation

  Type: Documentation
  mlr-org/mlr3#1308 · Filter by author sebffischer opened on May 19, 2025
  1

• Continuous Benchmarking

  Status: Discussion NeededType: Enhancement
  mlr-org/mlr3#1307 · Filter by author sebffischer opened on May 19, 2025
  4

  

• We should talk about how to efficiently wrap python-based Learners in mlr3

  Status: In Progress
  mlr-org/mlr3#1306 · Filter by author mb706 opened on May 14, 2025
  1

• Multiple outputs for regression task

  Status: Discussion NeededType: Enhancement
  mlr-org/mlr3#1296 · Filter by author tdhock opened on Apr 25, 2025
  8

• Missing checks on number of rows in ResamplingCV / do we handle grouping & stratification properly?

  Status: In ProgressWorkshop
  mlr-org/mlr3#1293 · Filter by author sebffischer opened on Apr 23, 2025
  3

  

• Move measures-things into mlr3measures?

  Status: Discussion Needed
  mlr-org/mlr3#1291 · Filter by author mb706 opened on Apr 17, 2025
  1

• we really need to check code for metrics in terms of "sample_weights" and normalization.

  WeightsWorkshop
  mlr-org/mlr3#1138 · Filter by author berndbischl opened on Aug 29, 2024
  2

  

• Measures: the whole NA handling seems overly complicated

  Status: Discussion NeededWorkshop
  mlr-org/mlr3#1099 · Filter by author berndbischl opened on Aug 20, 2024
  4

  

• columns that are not present during prediction that are not targets

  Status: Discussion NeededType: EnhancementWorkshop
  mlr-org/mlr3#1009 · Filter by author mb706 opened on Mar 12, 2024

• Error for bootstrap resampling on stacked/ensemble learner

  Workshop
  mlr-org/mlr3#903 · Filter by author h-a-graham opened on Feb 17, 2023
  1

  

• Bootstrap resampling in combination with certain data transforms causes error

  Workshop
  mlr-org/mlr3#833 · Filter by author rjstretch opened on Jun 28, 2022
  6

  

• timeout for resample or benchmark

  Priority: LowStatus: AvailableType: Enhancement
  mlr-org/mlr3#576 · Filter by author mb706 opened on Nov 4, 2020
  1