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MAINT: re-organize setup.py & make sure all tests are discoverable by nose
FEA add poisson loss to MLPRegressor (#30712)
FIX handling nan during scoring of early-stopping in MLPClassifier (#33774)
Make the test suite itself thread-safe to be able to detect thread-safety problems with or without free-threading (#30041)
MNT add isort to ruff's rules (#26649)