FA-100395 / Feature preprocessing fit scope / Member archive

Training frequency encoding uses held-out rows while fitting · case 05

Training frequency encoding uses held-out rows while fitting.

Member previewVariant 5 · 3 implementations · 7 checks per implementation

Case contract

Encode each scalar string with its relative frequency in the training sequence. Unseen values map to zero; an empty training sequence maps all transforms to zero.

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
relative frequencies	`[0.5, 0.3333333333333333, 0.16666666666666666]`	`[0.6666666666666666, 0.3333333333333333, 0]`	Failed

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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

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