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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.
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