b448657c15
Closed-verb init-mutation extractor for "Entity had N unit, but then
verb M" canonical compound form. Produces derived InitialPossession
(N ± M) through existing graph machinery (no short-circuit).
Admission delta: 0 (gsm8k-0010 sentence 1 now extracts but sentence 2
fraction_operand blocks). Barrier shifted: 1 case (0010: compound_statement
→ fraction_operand). Axis lane: 24/24 pass, wrong=0. S.1 lane: unchanged.
GSM8K admission set: {0014, 0018, 0042} unchanged.
4.2 KiB
ADR-0136.S.3 — Compound Initial-Mutation Extractor
Status: Accepted
Parent: ADR-0136 (Statement Layer Corridor)
Date: 2026-05-23
Context
The v2 refusal taxonomy (ADR-0136.S.2) identified 6 cases with compound_statement
as primary barrier. These cases contain two operations fused into a single sentence.
S.3 targets exactly one canonical shape — the initial-mutation form:
<Entity> had <N> <unit> [initially], but [then] <verb> <M>.
This is the simplest compound shape: a single derived InitialPossession(entity, N ± M, unit)
candidate, same topology as _CONJ_EMBEDDED_RE's SUM-emission pattern. Other compound
shapes (fraction-of-remainder, percentage-of, age-multiplier, verb-conjunction) are
structurally different and out of scope.
Decision
One shape, not "all of compound_statement"
The 6 compound_statement cases represent at least 5 distinct structural shapes. S.3 ships one extractor for the initial-mutation form only. Bundling multiple shapes would conflate distinct parser risks and violate the one-shape-per-PR discipline.
Closed verb sets
Past-tense only (the "had N, but then verb M" form requires past tense):
Subtract: lost, gave, gave away, used, spent, ate, dropped, sold
Add: gained, got, received, found, earned, picked up, bought
No wildcards. Verbs not in either set cause the sentence to refuse (not wrong).
No short-circuit path
Per ADR-0137's subsumption directive, the extractor produces a CandidateInitial
that flows through the existing graph machinery. No new bypass route was added.
Negative-result refusal
If N - M < 0, the extractor refuses. Emitting a negative quantity would violate the solver's non-negative invariant.
Per-Case Impact
| Case | v2 Barrier | S.3 Effect | Post-S.3 Barrier | Why |
|---|---|---|---|---|
| 0010 | compound_statement | Shifted | fraction_operand | Sentence 1 now parses (Yun, 8, paperclips); sentence 2 "1/4 more than" blocks |
| 0012 | compound_statement | No change | compound_statement | "his fish ate half of them" = compound + fraction + coreference |
| 0013 | compound_statement | No change | compound_statement | "uploads 10 one-hour videos each day" = nested embedded quantifier |
| 0016 | compound_statement | No change | compound_statement | "2 more than 5 miles" = comparative arithmetic, not init-mutation |
| 0032 | compound_statement | No change | compound_statement | "draws and colors 10 pictures" = verb conjunction, not init-mutation |
| 0033 | compound_statement | No change | compound_statement | "7 times her age" = multiplier, not init-mutation |
GSM8K Admission Count
| Metric | Pre-S.3 | Post-S.3 |
|---|---|---|
| Admitted (correct) | 3 | 3 |
| Wrong | 0 | 0 |
| Refused | 47 | 47 |
| Barrier shifted (v2 → v3) | — | 1 (gsm8k-0010) |
Direct admission delta: 0. gsm8k-0010's sentence 1 now extracts cleanly but sentence 2's fraction_operand blocks the case from admitting.
Axis Lane
24 curated cases at evals/math_capability_axes/S3_compound_initial_mutation/v1/:
| Category | Count | Gate |
|---|---|---|
| subtract_canonical | 4 | answer == expected |
| subtract_synonym | 7 | answer == expected |
| add_canonical | 4 | answer == expected |
| add_synonym | 5 | answer == expected |
| refusal_negative_result | 2 | answer is None |
| refusal_verb_miss | 2 | answer is None |
All 24 pass, wrong = 0.
Cross-Lane Regression
- S.1 rate_events: 20/20 pass, wrong = 0
- S.3 axis lane: 24/24 pass, wrong = 0
- GSM8K admission set: {0014, 0018, 0042} (unchanged)
Deferred
Every other compound shape from the 6 cases:
- 0012: "his fish ate half of them" — compound + fraction + coreference
- 0013: "uploads 10 one-hour videos each day" — nested embedded quantifier + temporal
- 0016: "2 more than 5 miles" — comparative arithmetic expression
- 0032: "draws and colors 10 pictures" — verb conjunction (single object, multiple verbs)
- 0033: "7 times her age" — age-multiplier compound
Evidence
- Parser addition:
generate/math_candidate_parser.py(_INIT_MUTATION_RE,_init_mutation_candidates) - Axis lane:
evals/math_capability_axes/S3_compound_initial_mutation/v1/ - Tests:
tests/test_adr_0136_S3_compound_initial_mutation.py