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

The groupant beside tools/nightingale/src/count.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
- **status:** partial source bound model
- **source:** [`tools/nightingale/src/count.rs`](https://github.com/ElamurAI/mova-free/blob/main/tools/nightingale/src/count.rs)
- **repository folder:** [`tools/nightingale/src/count.rs.groupant`](https://github.com/ElamurAI/mova-free/tree/main/tools/nightingale/src/count.rs.groupant)

> **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 | [Forward approximant](#forward-approximant) |
| **Ast** | partial | `syntax.json` |
| **Composition** | partial | [Composition](#composition) |
| **Cost** | partial | [Cost](#cost) |
| **Descriptant** | present | [Descriptant](#descriptant) |
| **Invariant** | partial | [Invariant](#invariant) |
| **Tests** | finite evidence | [Tests](#tests) |

## 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.

| relation | type | label | where |
|---|---|---|---|
| Behavior complement | behavior complement | partial source derived model | [Behavior complement](#behavior-complement) |
| Reverse reconstruction | reverse reconstruction | partial source derived model | [Reverse reconstruction](#reverse-reconstruction) |

## Model text


### Descriptant

Counting CoNLL-U sentences into part records (forms, lemmas, foreign tags, bigrams, dependency patterns both ways, trend buckets) and the streaming k-way merge of parts into a model with pruning and lineage. Source: `tools/nightingale/src/count.rs`.

### Forward approximant

Counter: doc -> dev split by SHA-256(key) mod m; sentence -> records keyed kind\tpayload with up to 3 example sentence numbers; finish sorts; store_part writes records, docs, dev sentences, then the sidecar. merge: verify part hashes and language, heap merge by key bytes, sum counts, examples in part-name order, prune by kind, pruned form mass per label, meta last.

### Invariant

Dev documents are never counted; the same parts give the same model bytes in any order; a part exists only with its sidecar; the shuffled control keeps every form count and sentence length.

### Cost

Counting O(tokens) with one map of records (1.15 GB for a 6.2 M-token tier-1 shard, 2026-11-06); merge O(R log P) time, one record per part in memory.

### Composition

Parent: nightingale.

### Behavior complement

Never deletes or rewrites a part; never mixes languages in a model. Evidence status: source-derived model with finite checks, not a proof.

### Reverse reconstruction

A model's meta lists its parts and their hashes; a part's docs file recovers its train and dev documents; counts are not inverted to sentences.

### Tests

#### Checks

tests/model.rs determinism and refusals; the shuffled control.
These are finite fixtures and measurements; not a proof.

## History


#### 2026-11-06 · document

##### Epoch 2026-11-06

First model, written with the source (the Nightingale: one per language under the Eel; a standard naturalness model with variety deltas).

## Provenance

- **source SHA-256:** `04a97e7c581ea672…`
- **repository commit:** `2e25d7bfae9a`