Add splits for ML datasets #150

Job	Run time
Test on macos-latest with Python 3.11	1m 9s
Test on macos-latest with Python 3.14	1m 31s
Test on windows-latest with Python 3.14	2m 24s
Test on windows-latest with Python 3.11	3m 42s
Test on ubuntu-latest with Python 3.14	1m 10s
Test on ubuntu-latest with Python 3.11	1m 11s
	11m 7s

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