---
license: cc-by-4.0
configs:
- config_name: default
  data_files:
  - split: emilia
    path: emilia/*
  - split: hifitts2
    path: hifitts2/*
splits:
- name: emilia
  num_examples: 1693423
- name: hifitts2
  num_examples: 1220574
language:
  - en
pipeline_tag: text-to-speech
tags:
- voxtream
- text-to-speech
---

# Model Card for VoXtream training dataset

This repository contains a training dataset for [VoXtream](https://huggingface.co/herimor/voxtream) TTS model.

The dataset contains 9k hours:

- 4.5k hours sampled from [Emilia](https://huggingface.co/datasets/amphion/Emilia-Dataset) dataset. We applied additional diarization to remove multi-speaker utterances and discarded utterances with invalid automatic transcripts. We also used [NISQA](https://github.com/gabrielmittag/NISQA) model to remove low-quality utterances.
- 4.5k hours sampled from [HiFiTTS2](https://huggingface.co/datasets/nvidia/hifitts-2) dataset (22 kHz subset). We selected only single-speaker utterances and filtered the dataset by the WER.

All utterances are 25-seconds long. For shorter audio clips we concatenated multiple utterances within the same speaker. Sampling rate: 24kHz.

### Description

- **mimi_codes_16cb** - Tokens extracted by the [Mimi](https://huggingface.co/kyutai/mimi) audio codec (16 codebooks).
- **phone_emb_indices** - Alignment of phoneme tokens to Mimi audio frames extracted by [MFA](https://montreal-forced-aligner.readthedocs.io).
- **phone_tokens** - Phoneme tokens.
- **sem_label_shifts** - Monotonic phoneme alignment labels.
- **spk_templates** - Speaker templates for the first 3 seconds of audio extracted by [ReDimNet](https://github.com/IDRnD/redimnet) model.
- **meta** - Metadata for each utterance and its index in the dataset.

### Sources 

- **Repository:** [repo](https://github.com/herimor/voxtream) 
- **Paper:** [paper](https://arxiv.org/pdf/2509.15969) 
- **Demo:** [demo](https://herimor.github.io/voxtream) 

## Get started

Clone our [repo](https://github.com/herimor/voxtream) and follow instructions in README file.

## Citation 

```
@article{torgashov2025voxtream,
  author    = {Torgashov, Nikita and Henter, Gustav Eje and Skantze, Gabriel},
  title     = {Vo{X}tream: Full-Stream Text-to-Speech with Extremely Low Latency},
  journal   = {arXiv:2509.15969},
  year      = {2025}
}
```