mlr3 0.20.2

• refactor: move RhpcBLASctl to suggest.

mlr3 0.20.1

• feat: Add multiclass Matthews correlation coefficient msr("classif.mcc").

mlr3 0.20.0

• Added support for learner-internal validation and tuning.

mlr3 0.19.0

• Added support for "marshal" property, which allows learners to process models so they can be serialized.
  This happens automatically during resample() and benchmark().
• Encapsulation methods use the same RNG state now.
• Fix missing values in default_values.Learner() function.
• Encapsulated error messages are now printed with the lgr package.

mlr3 0.18.0

• Prepare compatibility with new paradox version.
• feat: dictionary conversion of mlr_learners respects prototype arguments
  recently added in mlr3misc
• perf: skip unnecessary clone of learner's state in resample()

mlr3 0.17.2

• Skip new data.table tests on mac.

mlr3 0.17.1

• Remove data_prototype when resampling from learner$state to reduce memory consumption.
• Reduce number of threads used by data.table and BLAS to 1 when running resample() or benchmark() in parallel.
• Optimize runtime of resample() and benchmark() by reducing the number of hashing operations.

mlr3 0.17.0

• Learners cannot be added to the HotstartStack anymore when the model is missing.
• Learners bellow the hotstart_threshold are not added to the HotstartStack anymore.
• The learner$state$train_time in hotstarted learners is now only the time of the last training.
• Added debug messages to the hotstart stack.
• Fixed bug where the HotstartStack did not work with column roles set in the task.
• The design of benchmark() can now include parameter settings.
• Speed up resampling by removing unnecessary calls to packageVersion().
• Fix boston housing data set.
• Export generic function col_info to allow adding new methods for backends.
• Task printer includes row roles now.
• Add "mlr3.exec_chunk_bins" option to split the resampling iterations into a number of bins.

mlr3 0.16.1

• Function data.table() is now re-exported.
• Fixed a test which randomly failed.
• Improved documentation.
• Add encapsulation mode "try", which works similar to "none" but captures errors

mlr3 0.16.0

• Added argument paired to benchmark_grid() function, which can be used to create a benchmark design, where
  resamplings have been instantiated on tasks.
• Added S3 method for ResultData for as_resample_result() converter.
• Added S3 method for list for as_resample_result() converter.
• The featureless classification learner now returns proper probabilities
  (#918).