Elamur Groupantsqagen-fix-selection
The groupant beside qagen/src/fix.rs in the Mova repository: what the code computes, what it never does, how to go back from its outputs, its invariants, cost and checks.
Facts
Implementation material. A Mova code model describes this code at one source revision: partial models, finite checks and their stated scope. It is not a reviewed general exposition, and its labels are shown as written, never raised.
Components
| component | label | where |
|---|---|---|
| approximant | partial source model | forward |
| ast | partial | ../syntax.json |
| composition | partial source model | composition |
| cost | partial source model | cost |
| descriptant | partial source model | epoch-memory |
| invariant | partial source model | invariant |
| tests | partial source model | checks |
Obernants
The typed relations around the forward model: the behaviour complement (what the code never does), the reverse reconstruction (every input compatible with an output) and specialised views.
| id | type | label | where |
|---|---|---|---|
qagen-fix-selection-behavior-complement | behavior_complement | partial source model | behavior-complement |
qagen-fix-selection-reverse-reconstruction | reverse_reconstruction | partial source model | reverse-reconstruction |
qagen-fix-selection-row-schema | row_schema | partial source model | row-schema |
qagen-fix-selection-ordering | ordering | partial source model | ordering |
qagen-fix-selection-lemma-callbacks | lemma_callbacks | partial source model | lemma-callbacks |
qagen-fix-selection-selection-status | selection_status | partial source model | selection-status |
Model text
forward
TSV header and eight columns yield QaRow; selection maps anchor sent_id to paragraph ordinal, selects explicit span failures and logs implicit lemma doubts.
invariant
Batch zero rejected before input reads; selected items sort by paragraph index then pilot k; per paragraphs determine batch assignment.
behavior-complement
Selection does not infer or repair an unknown anchor ID. Only raw/b000.txt existence guards reselection; other existing raw files and metadata errors are not fully protected.
reverse-reconstruction
Selected items cannot recover successful explicit rows or most implicit rows. Empty selection admits zero rows or all valid rows.
cost
TSV O(bytes) storage; anchor mapping scans sentence IDs; item sorting O(I log I); paragraphs and output text are cloned/buffered.
composition
read_qa -> paragraph key lookup -> anchor conversion -> span/lemma decision -> sorted batches -> writes. Selection writes remain nontransactional.
row-schema
Invalid header, column count, numeric parse, qtype/exim abort. Positivity/uniqueness of pilot k is not newly imposed.
ordering
Stable text-order then question k; duplicate input coordinates are later rejected by checked batching.
lemma-callbacks
Implicit rows invoke supplied Lemmas; no model loaded internally by select.
selection-status
Summary explicit=span_ok+to_fix; doubtful implicit count is diagnostic, not a rejection.
checks
Synthetic embedded Rust tests, 1024 independent coverage cases, preflight sentinel artifacts, callback trace and compiled branch/arithmetic controls; debug and release twice, model-loading test explicitly skipped. See parent evidence.md for observed outcomes, not proof.
epoch-memory
Prospective model was saved before repair on 2026-10-30. Old source failed four library witnesses and one CLI witness. The tie control initially survived because [2,1,2] selects 2 for both first and last ties; the corrected [2,1] witness distinguishes them. Preserve this observation: duplicate-endpoint fixtures can hide tie regressions.
references
Original project implementation and rule v2: docs/context.md, qagen/src/gate.rs and qagen/src/run.rs. Model conventions: docs/groupants.md, docs/mathematical-modeling.md and docs/mathematical-modeling.md. No external solution code copied.
limitations
Finite local tests and partial syntax projections, no semantic AST or universal proof. Allocation failure and callback panic are outside successful-return model; filesystem races and write failures can interrupt publication. No live model/teacher/database/corpus used. No useful certified numeric surrogate is attached to these categorical/effectful interfaces; no invented error budget, substitution or speed claim.
This page in Markdown → https://md.groupants.elamur.ai/free/en/mova/qagen/src/fix.rs.groupant/selection.groupant/