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license: apache-2.0
base_model: ByteDance-Seed/Seed-Coder-8B-Base
library_name: transformers
tags:
- code
- code-completion
- code-editing
- fill-in-the-middle
- autocomplete
- lacuna
---
# Lacuna V1
> Experimental code edit completion model for numbered marker spans inside
> Seed-Coder FIM prompts.
Lacuna V1 predicts replacement code for marked edit regions. It is a completion
model, not a chat model.
## At A Glance
| Field | Value |
| --- | --- |
| Type | Completion model |
| Task | Code edit completion |
| Prompt style | Seed-Coder FIM + numbered markers |
| License | Apache-2.0 |
## Marker Contract
Markers define the regions to replace.
| Region | Open marker | Close marker |
| ---: | --- | --- |
| 1 | <code><|marker_1|></code> | <code><|marker_2|></code> |
| 2 | <code><|marker_3|></code> | <code><|marker_4|></code> |
| N | <code><|marker_2N-1|></code> | <code><|marker_2N|></code> |
The prompt contains the surrounding code context and marker placeholders. The
completion starts at the first marker and returns the replacement span with
markers included.
## Typical Input
```text
<[fim-suffix]>
return total;
}
<[fim-prefix]>
function sum(items) {
let total = 0;
for (const item of items) {
<|marker_1|><|marker_2|>
}
<[fim-middle]>
<|marker_1|>
```
## Typical Output
```text
<|marker_1|>
total += item.value;
<|marker_2|>
```
### Multiple Regions
For multiple edited regions, the output keeps the same marker order:
```text
<|marker_1|>
first replacement
<|marker_2|><|marker_3|>
second replacement
<|marker_4|>
```
## Completion Settings
| Setting | Value |
| --- | --- |
| `temperature` | `0` |
| `top_p` | `1` |
| `max_tokens` | `256` |
Use a larger `max_tokens` value for longer or multi-region edits.
## Limitations
Lacuna V1 is experimental. It can produce incorrect code, incomplete
replacements, or malformed marker spans. Validate output before applying edits
automatically.
## License
Apache-2.0.
|