FA-98059 / Sequence batch packing / Member archive
Left padding marks padded prefix tokens as valid · case 04
Left padding marks padded prefix tokens as valid.
Case contract
Left-pad tokens with zero to width and return paired binary validity mask, where only original token slots are one.
Why this case matters
This deterministic toy packing rule models a common boundary in preparing bounded training sequences.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| short prefix | [[0, 0, 0, 0, 0, 4], [1, 1, 1, 1, 1, 1]] | [[0, 0, 0, 0, 0, 4], [0, 0, 0, 0, 0, 1]] | Failed |
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