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FA-98252 / Autoregressive target shifting / Member archive

Start marker context is copied as its own target · case 02

Start marker context is copied as its own target.

Member previewVariant 2 · 3 implementations · 6 checks per implementation

Case contract

For observed tokens and bos, return [context,target] pairs beginning [bos, first token]; empty observations produce no pairs.

Why this case matters

A small deterministic token-stream contract makes next-token alignment errors inspectable.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixtureActualExpectedOutcome
first target[[0, 0], [2, 2]][[0, 2], [2, 3]]Failed

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

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