ONNX Runtime generate() API

Run Llama, Phi, Gemma, Mistral with ONNX Runtime.

This API gives you an easy, flexible and performant way of running LLMs on device.

It implements the generative AI loop for ONNX models, including pre and post processing, inference with ONNX Runtime, logits processing, search and sampling, and KV cache management.

You can call a high level generate() method to generate all of the output at once, or stream the output one token at a time.

See documentation at https://onnxruntime.ai/docs/genai.

Support matrix	Supported now	Under development	On the roadmap
Models	Gemma Llama-2 Llama-3 Mistral Phi-2 Phi-3	Whisper	Stable diffusion
API	Python C# C/C++	Java	Objective-C
Platform	Linux Windows	Android	Mac iOS
Architecture	x86 x64	Arm64
Hardware Acceleration	CUDA DirectML	QNN ROCm	OpenVINO

Installation

See https://onnxruntime.ai/docs/genai/how-to/install

Sample code for Phi-3 in Python

1. Download the model

   huggingface-cli download microsoft/Phi-3-mini-4k-instruct-onnx --include cpu_and_mobile/cpu-int4-rtn-block-32-acc-level-4/* --local-dir .

2. Install the API

   pip install numpy
   pip install --pre onnxruntime-genai

3. Run the model

   import onnxruntime_genai as og
   
   model = og.Model('cpu_and_mobile/cpu-int4-rtn-block-32-acc-level-4')
   tokenizer = og.Tokenizer(model)
   tokenizer_stream = tokenizer.create_stream()
    
   # Set the max length to something sensible by default,
   # since otherwise it will be set to the entire context length
   search_options = {}
   search_options['max_length'] = 2048
   
   chat_template = '<|user|>\n{input} <|end|>\n<|assistant|>'
   
   text = input("Input: ")
   if not text:
      print("Error, input cannot be empty")
      exit
   
   prompt = f'{chat_template.format(input=text)}'
   
   input_tokens = tokenizer.encode(prompt)
   
   params = og.GeneratorParams(model)
   params.set_search_options(**search_options)
   params.input_ids = input_tokens
   generator = og.Generator(model, params)
   
   print("Output: ", end='', flush=True)
   
   try:
      while not generator.is_done():
        generator.compute_logits()
        generator.generate_next_token()
   
        new_token = generator.get_next_tokens()[0]
        print(tokenizer_stream.decode(new_token), end='', flush=True)
   except KeyboardInterrupt:
       print("  --control+c pressed, aborting generation--")
   
   print()
   del generator

Contributing

This project welcomes contributions and suggestions. Most contributions require you to agree to a Contributor License Agreement (CLA) declaring that you have the right to, and actually do, grant us the rights to use your contribution. For details, visit https://cla.opensource.microsoft.com.

When you submit a pull request, a CLA bot will automatically determine whether you need to provide a CLA and decorate the PR appropriately (e.g., status check, comment). Simply follow the instructions provided by the bot. You will only need to do this once across all repos using our CLA.

This project has adopted the Microsoft Open Source Code of Conduct. For more information see the Code of Conduct FAQ or contact opencode@microsoft.com with any additional questions or comments.

Trademarks

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