1.4.0
ENH support unsupervised feature selection for percentile and k-best (#27721)
MNT add isort to ruff's rules (#26649)
ENH Adds polars output support to `set_output` API (#27315)
FEA Add metadata routing to SelectFromModel (#27490)
DOC Add a docstring example for feature selection functions (#28033)
DOC update the docstring and user guide for REFCV (#27411)
MNT SLEP6: raise NotImplementedError for meta-estimators not supporting metadata routing (#27389)