🦙 Python Bindings for llama.cpp

Simple Python bindings for @ggerganov's llama.cpp library. This package provides:

• Low-level access to C API via ctypes interface.
• High-level Python API for text completion
  • OpenAI-like API
  • LangChain compatibility

Installation

Install from PyPI (requires a c compiler):

pip install llama-cpp-python

The above command will attempt to install the package and build build llama.cpp from source. This is the recommended installation method as it ensures that llama.cpp is built with the available optimizations for your system.

This method defaults to using make to build llama.cpp on Linux / MacOS and cmake on Windows. You can force the use of cmake on Linux / MacOS setting the FORCE_CMAKE=1 environment variable before installing.

High-level API

>>> from llama_cpp import Llama
>>> llm = Llama(model_path="./models/7B/ggml-model.bin")
>>> output = llm("Q: Name the planets in the solar system? A: ", max_tokens=32, stop=["Q:", "\n"], echo=True)
>>> print(output)
{
  "id": "cmpl-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "object": "text_completion",
  "created": 1679561337,
  "model": "./models/7B/ggml-model.bin",
  "choices": [
    {
      "text": "Q: Name the planets in the solar system? A: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto.",
      "index": 0,
      "logprobs": None,
      "finish_reason": "stop"
    }
  ],
  "usage": {
    "prompt_tokens": 14,
    "completion_tokens": 28,
    "total_tokens": 42
  }
}

Web Server

llama-cpp-python offers a web server which aims to act as a drop-in replacement for the OpenAI API. This allows you to use llama.cpp compatible models with any OpenAI compatible client (language libraries, services, etc).

To install the server package and get started:

Linux/MacOS

pip install llama-cpp-python[server]
export MODEL=./models/7B/ggml-model.bin
python3 -m llama_cpp.server

Windows

pip install llama-cpp-python[server]
SET MODEL=..\models\7B\ggml-model.bin
python3 -m llama_cpp.server

Navigate to http://localhost:8000/docs to see the OpenAPI documentation.

Docker image

A Docker image is available on GHCR. To run the server:

docker run --rm -it -p8000:8000 -v /path/to/models:/models -eMODEL=/models/ggml-model-name.bin ghcr.io/abetlen/llama-cpp-python:latest

Low-level API

The low-level API is a direct ctypes binding to the C API provided by llama.cpp. The entire API can be found in llama_cpp/llama_cpp.py and should mirror llama.h.

Documentation

Documentation is available at https://abetlen.github.io/llama-cpp-python. If you find any issues with the documentation, please open an issue or submit a PR.

Development

This package is under active development and I welcome any contributions.

To get started, clone the repository and install the package in development mode:

git clone --recurse-submodules git@github.com:abetlen/llama-cpp-python.git
# Will need to be re-run any time vendor/llama.cpp is updated
python3 setup.py develop

How does this compare to other Python bindings of llama.cpp?

I originally wrote this package for my own use with two goals in mind:

• Provide a simple process to install llama.cpp and access the full C API in llama.h from Python
• Provide a high-level Python API that can be used as a drop-in replacement for the OpenAI API so existing apps can be easily ported to use llama.cpp

Any contributions and changes to this package will be made with these goals in mind.

License

This project is licensed under the terms of the MIT license.