Add splits for ML datasets #158

Job	Run time
Test on windows-latest with Python 3.14	2m 28s
Test on macos-latest with Python 3.14	1m 31s
Test on macos-latest with Python 3.11	1m 5s
Test on ubuntu-latest with Python 3.11	1m 3s
Test on windows-latest with Python 3.11	2m 23s
Test on ubuntu-latest with Python 3.14	1m 8s
	9m 38s

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