# `Embedding`

A vector with the model that made it, since vectors from different models can't be compared.

[Maths and data](types.md#maths-and-data); not ordered; since Jadpo 0.1.0.

## Make one

Build one from its fields, `Embedding { model: ...  vector: ... }`.

## Fields

| Field | Type |
|---|---|
| `model` | [`ModelId`](type-model-id.md) |
| `vector` | [`Vector`](type-vector.md) |

## Text, JSON and storage

It has no single text form, so `text.from` and `text.parse` don't take it. JSON sends an object of its parts.

| JSON |
|---|
| `{"model":"openai/text-embedding-3-small","vector":[0.5,-0.25,1]}` |
| `{"model":"ollama/nomic-embed-text","vector":[0.0123]}` |

It is stored in 3 columns, each named for the field, `_` and its suffix. This is `{"model":"ollama/nomic-embed-text","vector":[0.0123]}`:

| Column | Type | Holds |
|---|---|---|
| `<field>_model_provider` | `text` | `'ollama'` |
| `<field>_model_name` | `text` | `'nomic-embed-text'` |
| `<field>_vector` | `vector` | `'[0.0123]'::vector` |

## Shown to people

`text.format(value, locale:)` shows it to people in their locale.

With `locale: Locale.en_gb`:

| Value | Shown |
|---|---|
| `{"model":"openai/text-embedding-3-small","vector":[0.5,-0.25,1]}` | `openai/text-embedding-3-small [0.5; -0.25; 1]` |
| `{"model":"ollama/nomic-embed-text","vector":[0.0123]}` | `ollama/nomic-embed-text [0.0123]` |

## Operations

It has the contract's own operations: `text.format`, `json.read`, `json.write` and `==`. It isn't ordered, so `<` and sorting don't take it. [Every standard type meets one contract](../topics/every-standard-type-meets-one-contract.md) says how they work.