[dssutils] init prepare/apply train valid test
used to split dss object in train valid and test according to event number first map prepare: 1. duplicates data ([012]->[01201]) 2. saves correct chunk starts and stops: split 0: test=[0], valid=[1], train=[2] split 1: test=[1], valid=[2], train=[0] split 2: test=[2], valid=[0], train=[1] then map apply
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