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A tool for generating function arguments and choosing what function to call with local LLMs
| Date | Stars |
|---|---|
| 2026-07-31 | 435 |
| 2026-08-02 | 435 |
| 2026-09-14 | 435 |
| 2026-09-20 | 435 |
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# Local LLM function calling
[](https://local-llm-function-calling.readthedocs.io/en/latest/?badge=latest) [](https://badge.fury.io/py/local-llm-function-calling)
## Overview
The `local-llm-function-calling` project is designed to constrain the generation of Hugging Face text generation models by enforcing a JSON schema and facilitating the formulation of prompts for function calls, similar to OpenAI's [function calling](https://openai.com/blog/function-calling-and-other-api-updates) feature, but actually enforcing the schema unlike OpenAI.
The project provides a `Generator` class that allows users to easily generate text while ensuring compliance with the provided prompt and JSON schema. By utilizing the `local-llm-function-calling` library, users can conveniently control the output of text generation models. It uses my own quickly sketched `json-schema-enforcer` project as the enforcer.
## Features
- Constrains the generation of Hugging Face text generation models to follow a JSON schema.
- Provides a mechanism for formulating prompts for function calls, enabling precise data extraction and formatting.
- Simplifies the text generation process through a user-friendly `Generator` class.
## Installation
To install the `local-llm-function-calling` library, use the following command:
```shell
pip install local-llm-function-calling
```
## Usage
Here's a simple example demonstrating how to use `local-llm-function-calling`:
```python
from local_llm_function_calling import Generator
# Define a function and models
functions = [
{
"name": "get_current_weather",
"description": "Get the current weather in a given location",
"parameters": {
"type": "object",
"properties": {
"location": {
"type": "string",
"description": "The city and state, e.g. San Francisco, CA",
"maxLength": 20,
},
"unit": {"type": "string", "enum": ["celsius", "fahrenheit"]},
},
"required": ["location"],
},
}
]
# Initialize the generator with the Hugging Face model and our functions
generator = Generator.hf(functions, "gpt2")
# Generate text using a prompt
function_call = generator.generate("What is the weather like today in Brooklyn?")
print(function_call)
```
## Custom constraints
You don't have to use my prompting methods; you can craft your own prompts and your own constraints, and still benefit from the constrained generation:
```python
from local_llm_function_calling import Constrainer
from local_llm_function_calling.model.huggingface import HuggingfaceModel
# Define your own constraint
# (you can also use local_llm_function_calling.JsonSchemaConstraint)
def lowercase_sentence_constraint(text: str):
# Has to return (is_valid, is_complete)
return [text.islower(), text.endswith(".")]
# Create the constrainer
constrainer = Constrainer(HuggingfaceModel("gpt2"))
# Generate your text
generated = constrainer.generate("Prefix.\n", lowercase_sentence_constraint, max_len=10)
```
## Extending and Customizing
To extend or customize the prompt structure, you can subclass the `TextPrompter` class. This allows you to modify the prompt generation process according to your specific requirements.
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matched fp:94faf84f6874a400, topic:llm-inference, name:local llm
matched fp:94faf84f6874a400, topic:llm
matched fp:94faf84f6874a400, topic:json-schema