Ultravox V0 4

🚀 Ultravox

Ultravox is a multimodal Speech LLM that combines speech and text input capabilities, built on powerful pretrained backbones.

🚀 Quick Start

Think of the model as an LLM that can also hear and understand speech. As such, it can be used as a voice agent, and also to do speech-to-speech translation, analysis of spoken audio, etc.

To use the model, try the following:

# pip install transformers peft librosa

import transformers
import numpy as np
import librosa

pipe = transformers.pipeline(model='fixie-ai/ultravox-v0_4', trust_remote_code=True)

path = "<path-to-input-audio>"  # TODO: pass the audio here
audio, sr = librosa.load(path, sr=16000)


turns = [
  {
    "role": "system",
    "content": "You are a friendly and helpful character. You love to answer questions for people."
  },
]
pipe({'audio': audio, 'turns': turns, 'sampling_rate': sr}, max_new_tokens=30)

✨ Features

• Multimodal input support: Accepts both speech and text inputs.
• Potential for voice output in future revisions.
• Can be used for various speech-related tasks such as voice agents and speech translation.

📦 Installation

To use the model, you need to install the necessary libraries:

pip install transformers peft librosa

📚 Documentation

Model Details

Model Description

Ultravox is a multimodal model that can consume both speech and text as input (e.g., a text system prompt and voice user message). The input to the model is given as a text prompt with a special <|audio|> pseudo-token, and the model processor will replace this magic token with embeddings derived from the input audio. Using the merged embeddings as input, the model will then generate output text as usual.

In a future revision of Ultravox, we plan to expand the token vocabulary to support generation of semantic and acoustic audio tokens, which can then be fed to a vocoder to produce voice output. No preference tuning has been applied to this revision of the model.

• Developed by: Fixie.ai
• License: MIT

Model Sources

• Repository: https://ultravox.ai
• Demo: See repo

Training Details

The model uses a pre-trained Llama3.1-8B-Instruct backbone as well as the encoder part of Whisper-medium.

Only the multi-modal adapter is trained, while Whisper encoder and Llama are kept frozen.

We use a knowledge-distillation loss where Ultravox is trying to match the logits of the text-based Llama backbone.

Training Data

Training dataset is a mix of ASR datasets, extended by adding a "continuation" generated by Llama 3.1 8B.

Training Procedure

Supervised speech to audio finetuning. For more info, see training code in Ultravox repo.

Training Hyperparameters

• Training regime: BF16 mixed precision training
• Hardward used: 8x H100 GPUs

Speeds, Sizes, Times

The current version of Ultravox, when invoked with audio content, has a time-to-first-token (TTFT) of approximately 150ms, and a tokens-per-second rate of ~50-100 when using an A100-40GB GPU, all using a Llama 3.1 8B backbone.

Check out the audio tab on TheFastest.ai for daily benchmarks and a comparison with other existing models.

Evaluation

🔧 Technical Details

• Supported Languages: en, ar, de, es, fr, it, ja, pt, ru
• Datasets Used: fixie-ai/librispeech_asr, fixie-ai/common_voice_17_0, fixie-ai/peoples_speech, fnlp/AnyInstruct
• Metrics: bleu
• Pipeline Tag: audio-text-to-text

📄 License

This project is licensed under the MIT license.