My custom demucs library is used for batch source separation:
https://github.com/neonbjb/demucs

```
conda activate demucs
python setup.py install
CUDA_VISIBLE_DEVICES=0 python -m demucs /y/split/bt-music-5 --out=/y/separated/bt-music-5 --num_workers=2 --device cuda --two-stems=vocals
``