fdfb71f59b
core chat now decides Aristotelian syllogisms end-to-end -- the marquee
'basic logical work' widening. Closes Phase 0's fork: the ONLY categorical
decider was evals/syllogism/oracle.py (the sealed independence oracle serving
must not import; INV-25). This ships a production decider.
generate/proof_chain/categorical.py lowers a categorical argument to the
propositional regime (one Boolean atom per term-membership profile) and rides
the already-verified ROBDD engine -- no new decision procedure, soundness
inherits from the flagship. Sound AND complete for the modern/Boolean reading
(Darapti + existential-import-only forms correctly INVALID), with no reliance
on a lucky domain size. Independent of the eval oracle by mechanism (ROBDD-
over-profiles vs brute-force finite-model enumeration); proven by case-for-case
agreement with it across the whole syllogism gold lane.
New: generate/proof_chain/categorical.py, render_syllogism (deterministic
valid/invalid/inconsistent templates), CATEGORICAL shape-band, arena
categorical band (4 valid forms + 2 invalid, by-construction gold cross-checked
vs the independent syllogism oracle), tests/test_categorical_decider.py (8
tests incl. the independence-by-agreement proof).
Changed: chat/deduction_surface.py (categorical branch, license-gated via a
shared _license_gate helper; propositional path byte-identical), arena
DeductionSolver dual-path in lock-step with the composer, re-sealed ledger (5
bands, categorical earns SERVE at 0.99087 wrong=0), Phase-2 lane decide()
mirrors the dual path with the 3 categorical cases reclassified to their true
valid/invalid verdicts + 1 invalid case (n 27->28), report+SHA regenerated.
Honest wrinkles: irregular plurals ('fish') decline with unknown_morphology
(a reader limit, correctly not a wrong); surfaces read in singularized terms
('all whale are animal') -- the exact ids the engine reasoned over, no cosmetic
re-pluralization that could drift from the decision.
[Verification]: smoke 180 passed; cognition 122 passed/1 skipped; core test
--suite deductive 45 passed; test_categorical_decider 8 passed; practice
runner 5 bands all SERVE wrong=0; deduction_serve lane SHA regenerates to the
committed pin.
79 lines
3 KiB
Python
79 lines
3 KiB
Python
"""Deterministic shape-band classification for propositional arguments
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(deduction-serve arc, Phase 3).
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The **capability axis** the reliability ledger (ADR-0175) keys on for
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deduction serving. A shape-band is a purely structural signature of the
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projected ``(premises, query)`` formula strings — cheap, deterministic, and
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computed identically by the practice arena (which earns the per-class SERVE
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license) and the serving composer (which consults it). No decision logic:
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this says *what kind of argument* a case is, never whether it is entailed.
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The bands are deliberately coarse — each holds a MIX of entailed/refuted/
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unknown cases — so a class's measured reliability answers "does the whole
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serving pipeline (reader → projector → engine) decide arguments of this
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shape correctly?", which is the fallible part (the reader can misparse; the
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ROBDD engine cannot). A band that only ever saw entailed cases would measure
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nothing the engine's soundness doesn't already guarantee.
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"""
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from __future__ import annotations
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_IMPLIES = " implies "
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_OR = " or "
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#: The closed set of shape-bands. Serving classifies into exactly one of these;
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#: the practice arena earns a per-band SERVE license over the same set.
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DISJUNCTIVE = "disjunctive"
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CONDITIONAL_CHAIN = "conditional_chain"
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CONDITIONAL_SINGLE = "conditional_single"
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ATOMIC = "atomic"
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#: Band v1b (Phase 4) — categorical/syllogism arguments. Distinct from the four
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#: propositional bands: a categorical argument is projected by ``to_syllogism``
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#: (not ``to_deductive_logic``) and decided by ``generate.proof_chain.categorical``
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#: (the propositional-lowering decider), so the serving composer assigns this band
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#: directly rather than by ``classify_deduction_shape`` (which reads propositional
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#: formula strings).
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CATEGORICAL = "categorical"
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SHAPE_BANDS: tuple[str, ...] = (
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DISJUNCTIVE,
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CONDITIONAL_CHAIN,
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CONDITIONAL_SINGLE,
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ATOMIC,
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CATEGORICAL,
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)
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def classify_deduction_shape(premises: tuple[str, ...], query: str) -> str:
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"""The structural shape-band of a projected propositional argument.
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Priority order (first match wins), by the connectives present in the
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PREMISES only (the query's shape is a downstream concern of the engine,
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not of the capability axis):
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- ``disjunctive`` — any premise is a disjunction (``A or B``).
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- ``conditional_chain`` — two or more conditional premises (``A implies B``).
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- ``conditional_single`` — exactly one conditional premise.
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- ``atomic`` — no conditional, no disjunction (bare atoms /
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negations only).
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"""
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has_or = any(_OR in p for p in premises)
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if has_or:
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return DISJUNCTIVE
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n_implies = sum(1 for p in premises if _IMPLIES in p)
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if n_implies >= 2:
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return CONDITIONAL_CHAIN
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if n_implies == 1:
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return CONDITIONAL_SINGLE
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return ATOMIC
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__all__ = [
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"ATOMIC",
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"CATEGORICAL",
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"CONDITIONAL_CHAIN",
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"CONDITIONAL_SINGLE",
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"DISJUNCTIVE",
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"SHAPE_BANDS",
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"classify_deduction_shape",
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]
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