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