Nexa SDK

On-device Model Hub / Nexa SDK Documentation

Nexa SDK is a comprehensive toolkit for supporting ONNX and GGML models. It supports text generation, image generation, vision-language models (VLM), and text-to-speech (TTS) capabilities. Additionally, it offers an OpenAI-compatible API server with JSON schema mode for function calling and streaming support, and a user-friendly Streamlit UI. Users can run Nexa SDK in any device with Python environment, and GPU acceleration is supported.

Features

• Model Support:

  • ONNX & GGML models
  • Conversion Engine
  • Inference Engine:
    • Text Generation
    • Image Generation
    • Vision-Language Models (VLM)
    • Text-to-Speech (TTS)

Detailed API documentation is available here.

• Server:
  • OpenAI-compatible API
  • JSON schema mode for function calling
  • Streaming support
• Streamlit UI for interactive model deployment and testing

Below is our differentiation from other similar tools:

Feature	Nexa SDK	ollama	Optimum	LM Studio
GGML Support	✅	✅	❌	✅
ONNX Support	✅	❌	✅	❌
Text Generation	✅	✅	✅	✅
Image Generation	✅	❌	❌	❌
Vision-Language Models	✅	✅	✅	✅
Text-to-Speech	✅	❌	✅	❌
Server Capability	✅	✅	✅	✅
User Interface	✅	❌	❌	✅

Installation

We have released pre-built wheels for various Python versions, platforms, and backends for convenient installation on our index page.

How to clone this repo

git clone --recursive https://github.com/NexaAI/nexa-sdk

If you forget to use --recursive, you can use below command to add submodule

git submodule update --init --recursive

CPU

pip install nexaai --prefer-binary --index-url https://nexaai.github.io/nexa-sdk/whl/cpu --extra-index-url https://pypi.org/simple --no-cache-dir

GPU (Metal)

For the GPU version supporting Metal (macOS):

CMAKE_ARGS="-DGGML_METAL=ON -DSD_METAL=ON" pip install nexaai --prefer-binary --index-url https://nexaai.github.io/nexa-sdk/whl/metal --extra-index-url https://pypi.org/simple --no-cache-dir

FAQ: cannot use Metal/GPU on M1

Try the following command:

wget https://github.com/conda-forge/miniforge/releases/latest/download/Miniforge3-MacOSX-arm64.sh
bash Miniforge3-MacOSX-arm64.sh
conda create -n nexasdk python=3.10
conda activate nexasdk
CMAKE_ARGS="-DGGML_METAL=ON -DSD_METAL=ON" pip install nexaai --prefer-binary --index-url https://nexaai.github.io/nexa-sdk/whl/metal --extra-index-url https://pypi.org/simple --no-cache-dir

GPU (CUDA)

For Linux:

CMAKE_ARGS="-DGGML_CUDA=ON -DSD_CUBLAS=ON" pip install nexaai --prefer-binary --index-url https://nexaai.github.io/nexa-sdk/whl/cu124 --extra-index-url https://pypi.org/simple --no-cache-dir

For Windows PowerShell:

$env:CMAKE_ARGS="-DGGML_CUDA=ON -DSD_CUBLAS=ON"; pip install nexaai --prefer-binary --index-url https://nexaai.github.io/nexa-sdk/whl/cu124 --extra-index-url https://pypi.org/simple --no-cache-dir

For Windows Command Prompt:

set CMAKE_ARGS="-DGGML_CUDA=ON -DSD_CUBLAS=ON" & pip install nexaai --prefer-binary --index-url https://nexaai.github.io/nexa-sdk/whl/cu124 --extra-index-url https://pypi.org/simple --no-cache-dir

For Windows Git Bash:

CMAKE_ARGS="-DGGML_CUDA=ON -DSD_CUBLAS=ON" pip install nexaai --prefer-binary --index-url https://nexaai.github.io/nexa-sdk/whl/cu124 --extra-index-url https://pypi.org/simple --no-cache-dir

Note

If you want to use ONNX model, just replace pip install nexaai with pip install nexaai[onnx] in above commands

FAQ: Building Issues for llava

If you encounter the following issue while building:

try the following command:

CMAKE_ARGS="-DCMAKE_CXX_FLAGS=-fopenmp" pip install nexaai

Local Build

How to clone this repo

git clone --recursive https://github.com/NexaAI/nexa-sdk

If you forget to use --recursive, you can use below command to add submodule

git submodule update --init --recursive

Then you can build and install the package

pip install -e .

Docker Usage

Note: Docker doesn't support GPU acceleration

docker pull nexa4ai/sdk:latest

replace following placeholder with your path and command

docker run -v <your_model_dir>:/model -it nexa4ai/sdk:latest [nexa_command] [your_model_relative_path]

Example:

docker run -v /home/ubuntu/.cache/nexa/hub/official:/model -it nexa4ai/sdk:latest nexa gen-text /model/Phi-3-mini-128k-instruct/q4_0.gguf

will create an interactive session with text generation

Supported Models

Model	Type	Format	Command
octopus-v2	NLP	GGUF	nexa run octopus-v2
octopus-v4	NLP	GGUF	nexa run octopus-v4
tinyllama	NLP	GGUF	nexa run tinyllama
llama2	NLP	GGUF/ONNX	nexa run llama2
llama3	NLP	GGUF/ONNX	nexa run llama3
llama3.1	NLP	GGUF/ONNX	nexa run llama3.1
gemma	NLP	GGUF/ONNX	nexa run gemma
gemma2	NLP	GGUF	nexa run gemma2
qwen1.5	NLP	GGUF	nexa run qwen1.5
qwen2	NLP	GGUF/ONNX	nexa run qwen2
mistral	NLP	GGUF/ONNX	nexa run mistral
codegemma	NLP	GGUF	nexa run codegemma
codellama	NLP	GGUF	nexa run codellama
codeqwen	NLP	GGUF	nexa run codeqwen
deepseek-coder	NLP	GGUF	nexa run deepseek-coder
dolphin-mistral	NLP	GGUF	nexa run dolphin-mistral
phi2	NLP	GGUF	nexa run phi2
phi3	NLP	GGUF/ONNX	nexa run phi3
llama2-uncensored	NLP	GGUF	nexa run llama2-uncensored
llama3-uncensored	NLP	GGUF	nexa run llama3-uncensored
llama2-function-calling	NLP	GGUF	nexa run llama2-function-calling
nanollava	Multimodal	GGUF	nexa run nanollava
llava-phi3	Multimodal	GGUF	nexa run llava-phi3
llava-llama3	Multimodal	GGUF	nexa run llava-llama3
llava1.6-mistral	Multimodal	GGUF	nexa run llava1.6-mistral
llava1.6-vicuna	Multimodal	GGUF	nexa run llava1.6-vicuna
stable-diffusion-v1-4	Computer Vision	GGUF	nexa run sd1-4
stable-diffusion-v1-5	Computer Vision	GGUF/ONNX	nexa run sd1-5
lcm-dreamshaper	Computer Vision	GGUF/ONNX	nexa run lcm-dreamshaper
hassaku-lcm	Computer Vision	GGUF	nexa run hassaku-lcm
anything-lcm	Computer Vision	GGUF	nexa run anything-lcm
faster-whisper-tiny	Audio	BIN	nexa run faster-whisper-tiny
faster-whisper-small	Audio	BIN	nexa run faster-whisper-small
faster-whisper-medium	Audio	BIN	nexa run faster-whisper-medium
faster-whisper-base	Audio	BIN	nexa run faster-whisper-base
faster-whisper-large	Audio	BIN	nexa run faster-whisper-large

CLI Reference

Here's a brief overview of the main CLI commands:

• nexa run: Run inference for various tasks using GGUF models.
• nexa onnx: Run inference for various tasks using ONNX models.
• nexa server: Run the Nexa AI Text Generation Service.
• nexa pull: Pull a model from official or hub.
• nexa remove: Remove a model from local machine.
• nexa clean: Clean up all model files.
• nexa list: List all models in the local machine.
• nexa login: Login to Nexa API.
• nexa whoami: Show current user information.
• nexa logout: Logout from Nexa API.

For detailed information on CLI commands and usage, please refer to the CLI Reference document.

Start Local Server

To start a local server using models on your local computer, you can use the nexa server command. For detailed information on server setup, API endpoints, and usage examples, please refer to the Server Reference document.

Acknowledgements

We would like to thank the following projects:

• llama.cpp
• stable-diffusion.cpp
• optimum