---
license: cc-by-sa-4.0
language:
  - it
  - pt
  - es
  - fr
  - de
  - vi
  - id
  - ru
  - en
  - zh
task_categories:
  - text-to-speech
  - automatic-speech-recognition
size_categories:
  - n>1T
dataset_info:
  features:
    - name: audio
      dtype: audio
    - name: txt
      dtype: string
    - name: align
      dtype: string
---

## Overview

This dataset is part of **LEMAS (Large-scale Extensible Multilingual Audio Suite)**.
It contains a large-scale training set (150k+ hours) and a curated evaluation set
(100 utterances per language) covering 10 languages, all with word-level alignment.


## Fields
- `key`: unique utterance identifier; the first two characters indicate the language ID
- `audio`: relative path to the MP3 audio file
- `dur`: audio duration in seconds
- `txt`: original transcription
- `align.txt`: normalized text used for alignment
- `align.words`: list of word-level timestamps and confidence scores


## Statistics

### trainset
| lang | total_dur(h) | utterances | avg_dur(s) | total_chars | avg_chars | char/sec | total_words | avg_words | word/sec |
|------|-------------:|-----------:|-----------:|------------:|----------:|---------:|------------:|----------:|---------:|
| it   |       6116.69 |    7209567 |      3.054 |   281128388 |    38.994 |  12.7669 |    48859270 |     6.777 |   2.2188 |
| fr   |       6535.94 |    7557428 |      3.113 |   344633332 |    45.602 |  14.6469 |    65843169 |     8.712 |   2.7983 |
| vi   |       6600.07 |    6426292 |      3.697 |   387621747 |    60.318 |  16.3139 |    89903814 |    13.990 |   3.7838 |
| pt   |       7384.42 |    8682442 |      3.062 |   339417251 |    39.092 |  12.7678 |    60316112 |     6.947 |   2.2689 |
| de   |       9842.14 |   11003833 |      3.220 |   487581808 |    44.310 |  13.7612 |    80119609 |     7.281 |   2.2612 |
| id   |      11246.27 |   11659550 |      3.472 |   543857918 |    46.645 |  13.4331 |    85967394 |     7.373 |   2.1234 |
| es   |      21224.55 |   26407271 |      2.893 |  1011116926 |    38.289 |  13.2331 |   183673862 |     6.955 |   2.4038 |
| ru   |      22919.31 |   27474400 |      3.003 |   991530233 |    36.089 |  12.0172 |   163018329 |     5.933 |   1.9758 |
| en   |      25347.90 |    9515267 |      9.590 |  1419864294 |   149.220 |  15.5597 |   268676221 |    28.236 |   2.9443 |
| zh   |      32919.28 |   17776663 |      6.667 |  2474249286 |   139.185 |  20.8781 |   496957308 |    27.956 |   4.1934 |

Words and chars statistics are computed based on the normalized alignment text (`align.txt`).

## Notes

- The `eval` set is not the final version. We will complete further updates and release a technical report in a future update.