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Co-authored-by: OlivierDehaene <23298448+OlivierDehaene@users.noreply.github.com>
Co-authored-by: OlivierDehaene <olivier@huggingface.co>

Hopefully it's cleaner

Co-authored-by: Nick Hill <nickhill@us.ibm.com>

close #125

OPT models do not all have a `tokenizer.json` file on the hub at the
moment. Can't merge for now.

closes #99

closes #69

@njhill, @yk FYI

generated_text was concatenated to the user prompt for legacy reason. We
want to remove this behaviour as we don't think it is useful and even
detrimonial to usability.

We also remove the unused Vec.

Co-authored-by: Nick Hill <nickhill@us.ibm.com>