FA-100378 / Feature preprocessing fit scope / Member archive
Category vocabulary encoding applies fitted state incorrectly · case 03
Category vocabulary encoding applies fitted state incorrectly.
Case contract
Fit sorted unique string classes from train and return their zero-based positions for transform values; any unseen string receives sentinel -1.
Why this case matters
A small deterministic preprocessing contract makes the fit boundary and transform behavior directly inspectable.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| lexical train ids | [1, 0, 2, 2] | [1, 0, -1, -1] | Failed |
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