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Marius CiepluchandClaude Opus 5
86ed54c2e4
Task 3.1. A teacher is a vendored pair, at a review tier a maintainer stands behind, on the train split, and scorable. Every learning path now asks the same module that one question, so the split cannot be enforced in one place and forgotten in another. A refusal is data rather than an exception: the path records which holdout pairs a candidate touched and moves on, so a leak is visible in the run instead of silently accepted. The exporter refuses to seed from a holdout pair, leave-one-out teaches from the train split while still scoring every pair, and the mechanism lever refuses a candidate a holdout pair taught, because such a shape can only recover the pair that produced it. Measured and committed: on the vibe-py holdout the lever's own number falls from seven detected and a Youden of +0.059 to five detected and -0.059 once holdout pairs stop teaching, and the candidate set shrinks from ten shapes to six. That gap is the inflation this rule removes. Two existing tests encoded the leak and now encode the truth. The documented export-to-improve flow had a single holdout pair teaching itself, and now needs a train pair to teach and a holdout pair to recover. The obligation export claimed the corpus seeds at least one obligation shape, which was true only because holdout pairs were teaching: every vibe-py absence pair that yields an obligation lesson sits on the holdout side, so the honest number today is zero. The derivation stays covered by fixtures; the corpus gap belongs to the absence re-harvest and to a maintainer pass over the splits. Co-Authored-By: Claude Opus 5 (1M context) <[email protected]> Claude-Session: https://claude.ai/code/session_01T7XD7x5KonMdmGRkp63EQG
20 lines
721 B
JSON
20 lines
721 B
JSON
{
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"after": {
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"detected": 5,
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"shapes": 6,
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"silent": 11,
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"youden": -0.0588
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},
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"before": {
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"detected": 7,
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"shapes": 10,
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"silent": 11,
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"youden": 0.0588
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},
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"command": "ousast mechanisms export --slice vibe-py, then score every holdout pair with semantic.loo.score_pair_with_store",
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"generated": "2026-09-06",
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"holdout_pairs": 17,
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"note": "`before` is the behaviour this spec found: the exporter seeded candidate shapes from every vendored pair, so a shape a holdout pair taught could recover that same pair. `after` is the same measurement with the teacher rule enforced: only train-split, scorable, trusted pairs seed. The difference is the inflation.",
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"slice": "vibe-py"
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}
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