FA-100354 / Feature preprocessing fit scope / Member archive

Min-max scaling uses held-out rows while fitting · case 04

Min-max scaling uses held-out rows while fitting.

Member previewVariant 4 · 3 implementations · 7 checks per implementation

Case contract

Train and values are nonempty numeric lists. Fit min and max on train, map values linearly to that interval, and map all values to zero when the training range is zero. Round to six decimals.

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
inside	`[0.0, 0.5, 1.0]`	`[-0.5, 0.5, 1.5]`	Failed

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