add another test case

typo

merge conflict

another PR changed testing behavior, updated test cases in this commit

added input check for use_sampler

addressed code review comments

fixed pylint, not related to my changes

implementation 99% complete

everything and tested except for repeatable shuffling

tested most basic/typical split usecases

cleanup

some more cleanup

fix CI

more ci fix

more ci fixes

more ci fix

more ci fix

more ci fix

added more tests, fixed some bugs

some more clean up and test cases

added shard/shuffle before split warning/error

addressed code review comments and ci

fixed ci