FA-100399 / Feature preprocessing fit scope / Member archive

Training frequency encoding applies fitted state incorrectly · case 04

Training frequency encoding applies fitted state incorrectly.

Member previewVariant 4 · 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	`[0.6666666666666666, 0.3333333333333333, 0.3333333333333333]`	`[0.6666666666666666, 0.3333333333333333, 0]`	Failed

MEMBER ARCHIVE

The complete case is available to members.

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

Member access is invitation-based. Sign in with your invited account to inspect the sources.