---
language: gl
license: apache-2.0
datasets:
- CRPIH_UVigo-GL-Voices/Sabela 
tags:
- TTS
- speech-synthesis
- Galician
- female-speaker
- VITS
- coqui.ai 

---

# Celtia: Nos Project's Galician TTS Model
## Model description

This model was trained from scratch using the [Coqui TTS](https://github.com/coqui-ai/TTS) Python library on the corpus [Nos_Celtia-GL](https://zenodo.org/record/7716958).

A live inference demo can be found in our official page, [here](https://tts.nos.gal/).

This model was trained using graphemes. A preprocessing with the [Cotovía](http://gtm.uvigo.es/en/transfer/software/cotovia/) tool is needed for the input text.

## Intended uses and limitations

You can use this model to generate synthetic speech in Galician.

## How to use
### Usage

#### Cotovía preprocessor

To generate fonectic transcriptions, the Cotovía tool is needed. The tool can be downloaded from the [SourceForge](https://sourceforge.net/projects/cotovia/files/Debian%20packages/) website. The required debian packages are `cotovia_0.5_amd64.deb` and `cotovia-lang-gl_0.5_all.deb`, that can be installed with the following commands:

```bash
sudo dpkg -i cotovia_0.5_amd64.deb
sudo dpkg -i cotovia-lang-gl_0.5_all.deb
```

The tool can be used to generate the phonetic transcription of the text. The following command can be used to generate the phonetic transcription of a text string:

```bash
echo "Era unha avioneta... O piloto era pequeno, que se chega a ser dos grandes, tómbate!" | cotovia -p -n -S | iconv -f iso88591 -t utf8
```

The output of the command is the phonetic transcription of the input text. This string may be used in the inference part, as shown next.

Required libraries:

```bash
pip install TTS
```

Synthesize speech using python and the script preprocess.py, avaliable in this repository:

```bash
python preprocess.py text model_path config_path
```

This script takes a text input, preprocesses it with the cotovia tool, synthesizes speech from the preprocessed text, and saves the output as a .wav file.


## Training

### Hyperparameter

The model is based on VITS proposed by [Kim et al](https://arxiv.org/abs/2106.06103). The following hyperparameters were set in the coqui framework.

| Hyperparameter                     | Value                            |
|------------------------------------|----------------------------------|
| Model                              | vits                             |
| Batch Size                         | 26                               |
| Eval Batch Size                    | 16                               |
| Mixed Precision                    | true                             |
| Window Length                      | 1024                             |
| Hop Length                         | 256                              |
| FTT size                           | 1024                             |
| Num Mels                           | 80                               |
| Phonemizer                         | null                             |
| Phoneme Lenguage                   | en-us                            |
| Text Cleaners                      | multilingual_cleaners            |
| Formatter                          | nos_fonemas                      |
| Optimizer                          | adam                             |
| Adam betas                         | (0.8, 0.99)                      |
| Adam eps                           | 1e-09                            |
| Adam weight decay                  | 0.01                             |
| Learning Rate Gen                  | 0.0002                           |
| Lr. schedurer Gen                  | ExponentialLR                    |
| Lr. schedurer Gamma Gen            | 0.999875                         |
| Learning Rate Disc                 | 0.0002                           |
| Lr. schedurer Disc                 | ExponentialLR                    |
| Lr. schedurer Gamma Disc           | 0.999875                         |

The model was trained for 457900 steps.

The nos_fonemas formatter is a modification of the LJSpeech formatter with one extra column for the normalized input (extended numbers and acronyms).

## Additional information

### Authors
Carmen Magariños

### Contact information
For further information, send an email to proxecto.nos@usc.gal

### Licensing Information
[Apache License, Version 2.0](https://www.apache.org/licenses/LICENSE-2.0)

### Funding

This research was funded by “The Nós project: Galician in the society and economy of Artificial Intelligence”, resulting from the agreement 2021-CP080 between the Xunta de Galicia and the University of Santiago de Compostela, and thanks to the Investigo program, within the National Recovery, Transformation and Resilience Plan, within the framework of the European Recovery Fund (NextGenerationEU).

### Citation information

If you use this model, please cite as follows:

Magariños, Carmen. 2023. Nos_TTS-celtia-vits-graphemes. URL: https://huggingface.co/proxectonos/Nos_TTS-celtia-vits-graphemes