FA-100373 / Feature preprocessing fit scope / Member archive
Category vocabulary encoding uses held-out rows while fitting · case 03
Category vocabulary encoding uses held-out rows while fitting.
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 | [2, 1, 3, 0] | [1, 0, -1, -1] | Failed |
MEMBER ARCHIVE
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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.
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