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MAINT: re-organize setup.py & make sure all tests are discoverable by nose
FEA Implement classical MDS (#31322)
CI Fix scipy-dev remaining failures due to scipy sparse DeprecationWarning (#34632)
TST Fix locally_linear_embedding test with scipy-dev (#27628)
MNT Clean up deprecations for 1.9: default n_init in MDS (#33595)
EFF improve the eigsh call in spectral embedding (#33262)
MNT Use pyrefly instead of mypy for type-checking (#34527)