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Dataset split: session side lookup uses the date instead of the session · case 03

session side lookup uses the date instead of the session.

Member previewVariant 3 · 3 implementations · 6 checks per implementation

Case contract

Rows [id,session,date]. Return IDs belonging to sessions mapped to train; dates do not affect ownership.

Why this case matters

This toy split allocator makes membership rules explicit for reproducible evaluation fixtures.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixtureActualExpectedOutcome
cross date session[]["a", "b"]Failed

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