Riffusion Inference Server

Model inference backend for the Riffusion app.

• a diffusers pipeline that performs prompt interpolation combined with image conditioning
• a module for (approximately) converting between spectrograms and waveforms
• a flask server to provide model inference via API to the next.js app

Install

Tested with Python 3.9 and diffusers 0.9.0

conda create --name riffusion-inference python=3.9
conda activate riffusion-inference
python -m pip install -r requirements.txt

Run

Start the Flask server:

python -m riffusion.server --port 3013 --host 127.0.0.1 --checkpoint /path/to/diffusers_checkpoint

The model endpoint is now available at http://127.0.0.1:3013/run_inference via POST request.

Example input (see InferenceInput for the API):

{
  alpha: 0.75,
  num_inference_steps: 50,
  seed_image_id: "og_beat",

  start: {
    prompt: "church bells on sunday",
    seed: 42,
    denoising: 0.75,
    guidance: 7.0,
  },

  end: {
    prompt: "jazz with piano",
    seed: 123,
    denoising: 0.75,
    guidance: 7.0,
  },
}

Example output (see InferenceOutput for the API):

{
  image: "< base64 encoded PNG >",
  audio: "< base64 encoded MP3 clip >",,
}