1.2.1
FIX Support read-only sparse datasets for `Tree`-based estimators (#25341)
MNT Applies black formatting to most of the code base (#18948)
DOC fix some typos in docstring (#24416)
MAINT Handle `Tree.sample_weight` using a memoryview (#24994)
DOC Ensures that sklearn.tree._export.plot_tree passes numpydoc validation (#24559)
DOC fix broken citeseer links (#24800)
MNT Use cimport numpy as cnp for sklearn/tree (#23315)
CI Use latest Cython sources in scipy-dev build (#25300)
MAINT clean-up unused variables and imports in cython files (#24347)