feat(math): small-N degenerate parity — run the real math on tiny matrices in clojure-legacy mode#2653
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feat(math): small-N degenerate parity — run the real math on tiny matrices in clojure-legacy mode#2653jucor wants to merge 1 commit into
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…rices in clojure-legacy mode Clojure has NO small-dim guards: a 1x1 single-vote conversation computes center = the vote, a rank-capped zero component, a repness entry (the best-agree guarantee holds for one comment; rest-stats over zero other groups fall back to the (0+1)/(0+2) prior) and a consensus selection — pinned exactly by the vw every-vote step-0 recording (journal 2026-07-22 'every-vote step-0 diagnosis COMPLETE'). Python short-circuited to zeros/ empties below 2x2, which made the every-vote battery entry diverge from step 0 (4650/4683 steps). Legacy-gated changes (improved keeps every historical guard): - _compute_pca + pca_project_dataframe: <2 guards only fire on truly EMPTY dims in legacy; the powerit path runs at any size (comps already rank-capped; zero-variance yields Clojure's zero vector). Projections zero-pad to 2-D (Clojure's [pc1 pc2] destructure zero-fills a missing second component), as does the emitted comment-projection. - conv_repness: the shape<2 early return yields to the real computation. TDD: single-vote fixtures with exact Clojure-derived values (center -1.0, p-success 2/3, repness 4/3, best-agree), RED observed; improved-mode guards pinned unchanged. commit-id:00d8bc52
This was referenced Jul 22, 2026
docs(delphi): R1-parity goal docs, journal (2026-07-18 → 07-22 s3), quirks + divergence ledger
#2626
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Clojure has NO small-dim guards: a 1x1 single-vote conversation computes
center = the vote, a rank-capped zero component, a repness entry (the
best-agree guarantee holds for one comment; rest-stats over zero other
groups fall back to the (0+1)/(0+2) prior) and a consensus selection —
pinned exactly by the vw every-vote step-0 recording (journal 2026-07-22
'every-vote step-0 diagnosis COMPLETE'). Python short-circuited to zeros/
empties below 2x2, which made the every-vote battery entry diverge from
step 0 (4650/4683 steps).
Legacy-gated changes (improved keeps every historical guard):
EMPTY dims in legacy; the powerit path runs at any size (comps already
rank-capped; zero-variance yields Clojure's zero vector). Projections
zero-pad to 2-D (Clojure's [pc1 pc2] destructure zero-fills a missing
second component), as does the emitted comment-projection.
TDD: single-vote fixtures with exact Clojure-derived values (center -1.0,
p-success 2/3, repness 4/3, best-agree), RED observed; improved-mode
guards pinned unchanged.
commit-id:00d8bc52
Stack: