FA-100408 / Feature preprocessing fit scope / Member archive

Median imputation applies fitted state incorrectly · case 03

Median imputation applies fitted state incorrectly.

Member previewVariant 3 · 3 implementations · 7 checks per implementation

Case contract

Train and values are scalar numeric lists with optional None. Fit the ordinary median, averaging the two middle observations for even size; use zero if no observations.

Why this case matters

A small deterministic preprocessing contract makes the fit boundary and transform behavior directly inspectable.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
even training midpoint	`[0]`	`[2]`	Failed

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