---
title: "world-schoolbench-scoring — Mova code model"
description: "Mova code model of world/src/schoolbench.rs: components with their labels, obernants and the model text."
url: "https://groupants.elamur.ai/free/en/mova/world/src/schoolbench.rs.groupant/scoring.groupant/"
---
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# world-schoolbench-scoring

The groupant beside world/src/schoolbench.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:** [`world/src/schoolbench.rs`](https://github.com/ElamurAI/mova-free/blob/main/world/src/schoolbench.rs)
- **source SHA-256:** `31af0a29c60d6f58…`
- **covers:** Skip first line and # comments. Require exactly 15 tab cells. Accumulate right literal in exam bucket or fallback test bucket. Return four counts only when expected test/exam cardinalities agree. (bytes 4883–5730)
- **part of:** [world-schoolbench](https://md.groupants.elamur.ai/free/en/mova/world/src/schoolbench.rs.groupant/)
- **repository folder:** [`world/src/schoolbench.rs.groupant/scoring.groupant`](https://github.com/ElamurAI/mova-free/tree/main/world/src/schoolbench.rs.groupant/scoring.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 |
|---|---|---|---|
| `world-schoolbench-scoring-behavior-complement` | behavior_complement | partial source model | [behavior-complement](#behavior-complement) |
| `world-schoolbench-scoring-reverse-reconstruction` | reverse_reconstruction | partial source model | [reverse-reconstruction](#reverse-reconstruction) |
| `world-schoolbench-scoring-classification-boundary` | encoding_relation | partial source model | [classification-boundary](#classification-boundary) |
| `world-schoolbench-scoring-course-join` | composition_relation | partial source model | [course-join](#course-join) |

## Model text


Source-bound epoch 2026-10-30. Every view below uses this exact source revision and finite inputs with sufficient allocation resources. Forward/absent/reverse relations observe only the stated projection; filesystem models assume fixed supplied dependencies and distinguish successful returns from partial effects. Status: partial source model, with bounded native evidence in evidence.md at the root sidecar. No approximation percentage, universal proof or school accuracy claim.

### forward
Skip first line and # comments. Require exactly 15 tab cells. Accumulate right literal in exam bucket or fallback test bucket. Return four counts only when expected test/exam cardinalities agree.

### invariant
right<=total in each bucket; empty text with expected zero succeeds. First line is skipped without header validation.

### cost
Linear trace bytes; one row's split vector at a time; counters bounded by representable in-memory row count.

### composition
Leaf projections share exact lesson identities, selected indices, text bytes and option ordering. Compose only with those shared values retained; isolated score/length observations cannot recover them. Source inspection identifies knowledge::main_args dispatch, schoolbench selected-lessons -> counts -> run_course_lessons -> trace scoring, and schooltools option_line -> canon -> tally/lint/edit. Tests execute native pure helpers and isolated snapshot/restore; no live course/parser/teacher call.

### epoch-memory
Initial coverage records tolerant parser/score semantics and per-file effect boundaries. Model review exposed the direct zero restore index panic, repaired after old-code failure. Benchmark score loop was extracted unchanged to a pure private helper to test actual classification and width/count gates. Lock constructor failure may leave a stale directory; argument failures can consume flags. These remain explicit source-inspected limitations.

### checks
Native module filters schoolbench:: and schooltools::, including eight new wave9 tests; independent finite rank/cadence/length/fraction oracles and a restore no-effect fixture. Raw evidence is external under $MOVA_DATA/runs/octopus-wave9-school-2026-10-30; root evidence.md binds outcomes. Macro bodies in syntax projection remain opaque; finite agreement does not certify unbounded input space.

### behavior-complement
Type: behavior_complement. Subject: world-schoolbench-scoring, epoch 2026-10-30. Domain and observation: scoped inputs and projected outputs defined here. Operator/assumptions: Successful score cannot have wrong cell width or mismatching expected counts; semantic identifiers, header content and right labels other than exact right are not validated.
Evidence/status: source-inspected relation with the bounded tests named under checks; unenumerated behavior remains unknown. Complement claims are inner constraints, reverse claims retain all compatible candidates rather than identifying a historical cause.

### reverse-reconstruction
Type: reverse_reconstruction. Subject: world-schoolbench-scoring, epoch 2026-10-30. Domain and observation: scoped inputs and projected outputs defined here. Operator/assumptions: Fix expected counts; all permutations of rows and substitutions in ignored cells preserve totals. For zero totals, empty text and header-only text are both preimages.
Evidence/status: source-inspected relation with the bounded tests named under checks; unenumerated behavior remains unknown. Complement claims are inner constraints, reverse claims retain all compatible candidates rather than identifying a historical cause.

### classification-boundary
Type: encoding_relation. Subject: world-schoolbench-scoring, epoch 2026-10-30. Domain and observation: scoped inputs and projected outputs defined here. Operator/assumptions: All non-exam strings, including before and unknown, become test. Right comparison is case sensitive. Recorded-score test explicitly covers these otherwise easy-to-misstate cases.
Evidence/status: source-inspected relation with the bounded tests named under checks; unenumerated behavior remains unknown. Complement claims are inner constraints, reverse claims retain all compatible candidates rather than identifying a historical cause.

### course-join
Type: composition_relation. Subject: world-schoolbench-scoring, epoch 2026-10-30. Domain and observation: scoped inputs and projected outputs defined here. Operator/assumptions: main_args obtains expected cardinalities from selected Lesson tests/exams, passes same selected sequence to run_course_lessons, then checks trace cardinality. This is an inspected actual join plus native scorer tests, not execution of parser/teacher/course.
Evidence/status: source-inspected relation with the bounded tests named under checks; unenumerated behavior remains unknown. Complement claims are inner constraints, reverse claims retain all compatible candidates rather than identifying a historical cause.