XLS-R model was trained using connectionist temporal classification (CTC) so the model output has to be decoded using
  [Wav2Vec2CTCTokenizer].
Relevant checkpoints can be found under https://huggingface.co/models?other=xls_r.
XLS-R's architecture is based on the Wav2Vec2 model, so one can refer to Wav2Vec2's documentation page.
The original code can be found here.
