Moonshine

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Moonshine is a family of speech-to-text models optimized for fast and accurate automatic speech recognition (ASR) on resource-constrained devices. It is well-suited to real-time, on-device applications like live transcription and voice command recognition. Moonshine obtains word-error rates (WER) better than similarly-sized Whisper models from OpenAI on the datasets used in the OpenASR leaderboard maintained by HuggingFace:

Tiny

Base

WER	Moonshine	Whisper
Average	12.66	12.81
AMI	22.77	24.24
Earnings22	21.25	19.12
Gigaspeech	14.41	14.08
LS Clean	4.52	5.66
LS Other	11.71	15.45
SPGISpeech	7.70	5.93
Tedlium	5.64	5.97
Voxpopuli	13.27	12.00

WER	Moonshine	Whisper
Average	10.07	10.32
AMI	17.79	21.13
Earnings22	17.65	15.09
Gigaspeech	12.19	12.83
LS Clean	3.23	4.25
LS Other	8.18	10.35
SPGISpeech	5.46	4.26
Tedlium	5.22	4.87
Voxpopuli	10.81	9.76

Moonshine's compute requirements scale with the length of input audio. This means that shorter input audio is processed faster, unlike existing Whisper models that process everything as 30-second chunks. To give you an idea of the benefits: Moonshine processes 10-second audio segments 5x faster than Whisper while maintaining the same (or better!) WER.

This repo hosts the inference code for Moonshine.

Installation
Examples
TODO
Citation

Installation

We like uv for managing Python environments, so we use it here. If you don't want to use it, simply skip the first step and leave uv off of your shell commands.

1. Create a virtual environment

First, install uv for Python environment management.

Then create and activate a virtual environment:

uv venv env_moonshine
source env_moonshine/bin/activate

2. Install the Moonshine package

The moonshine inference code is written in Keras and can run with each of the backends that Keras supports: Torch, TensorFlow, and JAX. The backend you choose will determine which flavor of the moonshine package to install. If you're just getting started, we suggest installing the (default) Torch backend:

uv pip install useful-moonshine@git+https://github.com/usefulsensors/moonshine.git

To run the provided inference code, you have to instruct Keras to use the PyTorch backend by setting an environment variable:

export KERAS_BACKEND=torch

To run with the TensorFlow backend, run the following to install Moonshine and set the environment variable:

uv pip install useful-moonshine[tensorflow]@git+https://github.com/usefulsensors/moonshine.git
export KERAS_BACKEND=tensorflow

To run with the JAX backend, run the following:

uv pip install useful-moonshine[jax]@git+https://github.com/usefulsensors/moonshine.git
export KERAS_BACKEND=jax
# Use useful-moonshine[jax-cuda] for jax on GPU

To run with ONNX runtime that is supported on platforms, run the following:

uv pip install useful-moonshine[onnx]@git+https://github.com/usefulsensors/moonshine.git

3. Try it out

You can test Moonshine by transcribing the provided example audio file with the .transcribe function:

python
>>> import moonshine
>>> moonshine.transcribe(moonshine.ASSETS_DIR / 'beckett.wav', 'moonshine/tiny')
['Ever tried ever failed, no matter try again, fail again, fail better.']

The first argument is a path to an audio file and the second is the name of a Moonshine model. moonshine/tiny and moonshine/base are the currently available models. Use the moonshine.transcribe_with_onnx function to use the ONNX runtime for inference. The parameters are the same as they are for moonshine.transcribe.

Examples

The Moonshine models can be used with a variety of different runtimes and applications, so we've included code samples showing how to use them in different situations. The moonshine/demo folder in this repository also has more information on many of them.

Onnx standalone

The latest versions of the Onnx Moonshine models are available on HuggingFace at huggingface.co/UsefulSensors/moonshine/tree/main/onnx. You can find an example Python script and more information about running them in the demo folder.

Live Captions

You can try the Moonshine models with live input from a microphone on many platforms with the live captions demo.

CTranslate2

The files for the CTranslate2 versions of Moonshine are available at huggingface.co/UsefulSensors/moonshine/tree/main/ctranslate2, but they require a pull request to be merged before they can be used with the mainline version of the framework. Until then, you should be able to try them with our branch, with this example script.

TODO

Citation

If you benefit from our work, please cite us:

@misc{jeffries2024moonshinespeechrecognitionlive,
      title={Moonshine: Speech Recognition for Live Transcription and Voice Commands}, 
      author={Nat Jeffries and Evan King and Manjunath Kudlur and Guy Nicholson and James Wang and Pete Warden},
      year={2024},
      eprint={2410.15608},
      archivePrefix={arXiv},
      primaryClass={cs.SD},
      url={https://arxiv.org/abs/2410.15608}, 
}