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

The groupant beside prag/src/fbench.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:** [`prag/src/fbench.rs`](https://github.com/ElamurAI/mova-free/blob/main/prag/src/fbench.rs)
- **source SHA-256:** `ccddfbd624b55849…`
- **covers:** Eligibility: nonempty gold verb with matching first word OR at least two matching agent/patient/to/place entities. Weight=4*head equality+full verb equality+2*role matches+kind equality. Sort descending weight then ascending gold/system positions and greedily accept unused endpoints. (bytes 6925–8503)
- **part of:** [prag-fbench](https://md.groupants.elamur.ai/free/en/mova/prag/src/fbench.rs.groupant/)
- **repository folder:** [`prag/src/fbench.rs.groupant/alignment.groupant`](https://github.com/ElamurAI/mova-free/tree/main/prag/src/fbench.rs.groupant/alignment.groupant)
- **repository commit:** `855da7bd4a7b`

> **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 |
|---|---|---|---|
| `prag-fbench-alignment-behavior-complement` | behavior_complement | partial source model | [behavior-complement](#behavior-complement) |
| `prag-fbench-alignment-reverse-reconstruction` | reverse_reconstruction | partial source model | [reverse-reconstruction](#reverse-reconstruction) |
| `prag-fbench-alignment-specialization` | fbench_alignment_projection | partial source model | [specialization](#specialization) |

## Model text


### model

## prag-fbench-alignment

### forward
Eligibility: nonempty gold verb with matching first word OR at least two matching agent/patient/to/place entities. Weight=4*head equality+full verb equality+2*role matches+kind equality. Sort descending weight then ascending gold/system positions and greedily accept unused endpoints.

### invariant
Partial injection, not maximum-weight matching. Entity same is nonempty ID intersection and is not transitive equivalence.

### cost
O(G*S*C+P log P+P log(G+S)), O(P+G+S) memory.

### behavior-complement
Reuse of either endpoint, eligibility from one role with different verb heads, and reverse positional tie preference are excluded. Universe: bounded supplied inputs and candidate observable outputs at this source revision. Partial source-derived inner exclusions with finite witness evidence; unsampled semantics remain unknown.

### reverse-reconstruction
Mapping alone leaves many possible ranks and frames. A compatible rank trace must have each skipped earlier pair blocked by a used endpoint. Target is all x in the stated domain with F(x)=y, without unique recovery or an implemented complete solver.

### specialization
Eligibility intervention from two roles to three compiles and fails alignment_ties_and_threshold.

### composition
Children share source identity. Preserve frame indices through alignment/link mapping and batch references through prompt/gate numbering. Independent marginal inverses can lose shared correlations; overlap costs are counted once.

### checks
Six fbench and five silver wave16_models tests: finite canonical role oracle, independent ten-role counts, old-code witnesses and compiled controls. See receipts at file root.

### epoch-memory
2026-10-30: prospective inspection predicted predecessor defects and duplicate-edge recall inflation. Three old-code witnesses confirm these. Valid adjacency and unique links retain semantics. No score assertions or deduplication introduced. Historical metrics retain original semantics.

### limitations
Partial syntax is not expanded semantic AST; macros opaque. Scoped models and finite observations, not full-file verification or proof. No live parser, teacher, corpus, filesystem aggregate, GPU, full course, speed or approximation-cap claim. External effects and resource-extreme malformed inputs remain unexecuted.

### evidence

#### Evidence scope

See root receipts.md for source and raw-log hashes. Pure supplied fixtures only; effects are source inspected.