1.4.0
ENH: Added __init__.py into ensemble/tests/
MAINT remove deprecated base_estimator and base_estimator_ (#27826)
MNT add isort to ruff's rules (#26649)
CI Fix scipy-dev build (#28047)
FIX divide by zero in line search of GradientBoostingClassifier (#28095)
FIX IsolationForest accepts sparse matrix with float value contamination (#27645)
TST Extend tests for `scipy.sparse.*array` in `sklearn/ensemble/tests/test_stacking.py` (#27214)