README.md

---
language: "cs"
tags:
- Czech
- KKY
- FAV
license: "cc-by-nc-sa-4.0"
---

# wav2vec2-base-cs-50k
This is a monolingual Czech Wav2Vec 2.0 base model pre-trained from 50 thousand hours of Czech speech.
It has been released along with a paper **A Comparative Analysis of Bilingual and Trilingual Wav2Vec Models for
Automatic Speech Recognition in Multilingual Oral History Archives** accepted to INTERSPEECH2024 conference. 

## Paper 
https://www.isca-archive.org/interspeech_2024/lehecka24_interspeech.pdf

Pre-print: http://arxiv.org/abs/2407.17160.

### All pre-trained models released along with the paper
- [fav-kky/wav2vec2-base-cs-50k](https://huggingface.co/fav-kky/wav2vec2-base-cs-50k) (monolingual Czech)
- [fav-kky/wav2vec2-base-de-50k](https://huggingface.co/fav-kky/wav2vec2-base-de-50k) (monolingual German)
- [fav-kky/wav2vec2-base-cs-en-100k](https://huggingface.co/fav-kky/wav2vec2-base-cs-en-100k) (bilingual Czech+English)
- [fav-kky/wav2vec2-base-cs-de-100k](https://huggingface.co/fav-kky/wav2vec2-base-cs-de-100k) (bilingual Czech+German)
- [fav-kky/wav2vec2-base-en-de-100k](https://huggingface.co/fav-kky/wav2vec2-base-en-de-100k) (bilingual English+German)
- [fav-kky/wav2vec2-base-cs-en-de-150k](https://huggingface.co/fav-kky/wav2vec2-base-cs-en-de-150k) (trilingual Czech+English+German)

## Citation
If you find this model useful, please cite our paper:
```
@inproceedings{lehecka24_interspeech,
  title     = {A Comparative Analysis of Bilingual and Trilingual Wav2Vec Models for Automatic Speech Recognition in Multilingual Oral History Archives},
  author    = {Jan Lehečka and Josef V. Psutka and Lubos Smidl and Pavel Ircing and Josef Psutka},
  year      = {2024},
  booktitle = {Interspeech 2024},
  pages     = {1285--1289},
  doi       = {10.21437/Interspeech.2024-472},
  issn      = {2958-1796},
}
```

## Usage
This model does not have a tokenizer as it was pretrained on audio alone.
In order to use this model for speech recognition, a tokenizer should be created 
and the model should be [fine-tuned](https://huggingface.co/blog/fine-tune-wav2vec2-english) on labeled ASR data.

Inputs must be 16kHz mono audio files.

This model can be used e.g., to extract per-frame contextual embeddings from audio:
```python
from transformers import Wav2Vec2Model, Wav2Vec2FeatureExtractor
import torchaudio

feature_extractor = Wav2Vec2FeatureExtractor.from_pretrained("fav-kky/wav2vec2-base-cs-50k")
model = Wav2Vec2Model.from_pretrained("fav-kky/wav2vec2-base-cs-50k")

speech_array, sampling_rate = torchaudio.load("/path/to/audio/file.wav")
inputs = feature_extractor(
    speech_array, 
    sampling_rate=16_000, 
    return_tensors="pt"
)["input_values"][0]

output = model(inputs)
embeddings = output.last_hidden_state.detach().numpy()[0]
```

## Related works