---
title: "qagen-fix-batching — Mova code model"
description: "Mova code model of qagen/src/fix.rs: components with their labels, obernants and the model text."
url: "https://groupants.elamur.ai/free/en/mova/qagen/src/fix.rs.groupant/batching.groupant/"
---
Elamur: [Mova](https://md.mova.elamur.ai/free/en/) · [Dictionary](https://md.dictionary.elamur.ai/free/en/) · [Research](https://md.research.elamur.ai/free/en/) · **Groupants**

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# qagen-fix-batching

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

- **kind:** groupant_fragment
- **status:** partial source bound model
- **source:** [`qagen/src/fix.rs`](https://github.com/ElamurAI/mova-free/blob/main/qagen/src/fix.rs)
- **source SHA-256:** `f491a1f6223c6912…`
- **covers:** try_new checks alignment then delegates stable grouping; prompt numbers each paragraph's items; Job adapter uses the same vectors. (bytes 10745–14864)
- **part of:** [qagen-fix](https://md.groupants.elamur.ai/free/en/mova/qagen/src/fix.rs.groupant/)
- **repository folder:** [`qagen/src/fix.rs.groupant/batching.groupant`](https://github.com/ElamurAI/mova-free/tree/main/qagen/src/fix.rs.groupant/batching.groupant)
- **repository commit:** `48f2e6f74146`

> **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](#forward) |
| **ast** | partial | `../syntax.json` |
| **composition** | partial source model | [composition](#composition) |
| **cost** | partial source model | [cost](#cost) |
| **descriptant** | partial source model | [epoch-memory](#epoch-memory) |
| **invariant** | partial source model | [invariant](#invariant) |
| **tests** | partial source model | [checks](#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-batching-behavior-complement` | behavior_complement | partial source model | [behavior-complement](#behavior-complement) |
| `qagen-fix-batching-reverse-reconstruction` | reverse_reconstruction | partial source model | [reverse-reconstruction](#reverse-reconstruction) |
| `qagen-fix-batching-preflight-order` | preflight_order | partial source model | [preflight-order](#preflight-order) |
| `qagen-fix-batching-legacy-domain` | legacy_domain | partial source model | [legacy-domain](#legacy-domain) |
| `qagen-fix-batching-callback-count` | callback_count | partial source model | [callback-count](#callback-count) |
| `qagen-fix-batching-batch-order` | batch_order | partial source model | [batch-order](#batch-order) |

## Model text


### forward
try_new checks alignment then delegates stable grouping; prompt numbers each paragraph's items; Job adapter uses the same vectors.

### invariant
For checked input every item appears in exactly one matching paragraph batch and has in-range anchors; original per-paragraph item order survives.

### behavior-complement
try_new never drops orphan items or duplicates their emission via duplicate paragraphs. Legacy new remains unchecked; missing direct Job batch access can panic.

### reverse-reconstruction
Grouping loses input interleaving between paragraphs; multiple item permutations across distinct paragraphs yield the same prompt. Prompt text does not recover reason metadata.

### cost
Validation O((P+I) log(P+I)+anchors); grouping expected O(P+I) key hashing plus BTreeMap factors. Prompt item filtering can be O(P*I), not optimized here.

### composition
Validation closes missing/duplicate/batch/anchor preconditions before inherited grouping. Prompt and gate agree on stable item numbering when using checked batches.

### preflight-order
Duplicate paragraph first; per item missing paragraph, duplicate item, mismatched batch, invalid anchors. Empty paragraph/item collections accepted.

### legacy-domain
new retains previous HashMap behavior; callers needing validation choose try_new.

### callback-count
Job check calls gate once; it does not invoke teacher or lemma callbacks.

### batch-order
BTreeMap orders batch IDs; input paragraph order is retained within each batch.

### 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.