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# Common Voice
[Common Voice](https://commonvoice.mozilla.org/en/datasets) is a public domain speech corpus with 11.2K hours of read
speech in 76 languages (the latest version 7.0). We provide examples for building
[Transformer](https://arxiv.org/abs/1809.08895) models on this dataset.
## Data preparation
[Download](https://commonvoice.mozilla.org/en/datasets) and unpack Common Voice v4 to a path `${DATA_ROOT}/${LANG_ID}`.
Create splits and generate audio manifests with
```bash
python -m examples.speech_synthesis.preprocessing.get_common_voice_audio_manifest \
--data-root ${DATA_ROOT} \
--lang ${LANG_ID} \
--output-manifest-root ${AUDIO_MANIFEST_ROOT} --convert-to-wav
```
To denoise audio and trim leading/trailing silence using signal processing based VAD, run
```bash
for SPLIT in dev test train; do
python -m examples.speech_synthesis.preprocessing.denoise_and_vad_audio \
--audio-manifest ${AUDIO_MANIFEST_ROOT}/${SPLIT}.audio.tsv \
--output-dir ${PROCESSED_DATA_ROOT} \
--denoise --vad --vad-agg-level 2
done
```
which generates a new audio TSV manifest under `${PROCESSED_DATA_ROOT}` with updated path to the processed audio and
a new column for SNR.
To do filtering by CER, follow the [Automatic Evaluation](../docs/ljspeech_example.md#automatic-evaluation) section to
run ASR model (add `--eval-target` to `get_eval_manifest` for evaluation on the reference audio; add `--err-unit char`
to `eval_asr` to compute CER instead of WER). The example-level CER is saved to
`${EVAL_OUTPUT_ROOT}/uer_cer.${SPLIT}.tsv`.
Then, extract log-Mel spectrograms, generate feature manifest and create data configuration YAML with
```bash
python -m examples.speech_synthesis.preprocessing.get_feature_manifest \
--audio-manifest-root ${AUDIO_MANIFEST_ROOT} \
--output-root ${FEATURE_MANIFEST_ROOT} \
--ipa-vocab --lang ${LANG_ID} \
--snr-threshold 15 \
--cer-threshold 0.1 --cer-tsv-path ${EVAL_OUTPUT_ROOT}/uer_cer.${SPLIT}.tsv
```
where we use phoneme inputs (`--ipa-vocab`) as example. For sample filtering, we set the SNR and CER threshold
to 15 and 10%, respectively.
## Training
(Please refer to [the LJSpeech example](../docs/ljspeech_example.md#transformer).)
## Inference
(Please refer to [the LJSpeech example](../docs/ljspeech_example.md#inference).)
## Automatic Evaluation
(Please refer to [the LJSpeech example](../docs/ljspeech_example.md#automatic-evaluation).)
## Results
| Language | Speakers | --arch | Params | Test MCD | Model |
|---|---|---|---|---|---|
| English | 200 | tts_transformer | 54M | 3.8 | [Download](https://dl.fbaipublicfiles.com/fairseq/s2/cv4_en200_transformer_phn.tar) |
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