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31 lines
1.2 KiB
Markdown
31 lines
1.2 KiB
Markdown
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+++
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disableToc = false
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title = "✍️ Constrained grammars"
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weight = 6
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+++
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The chat endpoint accepts an additional `grammar` parameter which takes a [BNF defined grammar](https://en.wikipedia.org/wiki/Backus%E2%80%93Naur_form).
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This allows the LLM to constrain the output to a user-defined schema, allowing to generate `JSON`, `YAML`, and everything that can be defined with a BNF grammar.
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{{% notice note %}}
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This feature works only with models compatible with the [llama.cpp](https://github.com/ggerganov/llama.cpp) backend (see also [Model compatibility]({{%relref "model-compatibility" %}})). For details on how it works, see the upstream PRs: https://github.com/ggerganov/llama.cpp/pull/1773, https://github.com/ggerganov/llama.cpp/pull/1887
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{{% /notice %}}
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## Setup
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Follow the setup instructions from the [LocalAI functions]({{%relref "features/openai-functions" %}}) page.
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## 💡 Usage example
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For example, to constrain the output to either `yes`, `no`:
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```bash
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curl http://localhost:8080/v1/chat/completions -H "Content-Type: application/json" -d '{
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"model": "gpt-4",
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"messages": [{"role": "user", "content": "Do you like apples?"}],
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"grammar": "root ::= (\"yes\" | \"no\")"
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}'
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```
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