Clean up w/ black

Fix regular positional encoding implementation

Set default `pe_period` to None

Update demonstrateur

Fix issue with readthedocs

Try to spot makethedocs issue

Add demonstrateur oze

Merge pull request #35 from shamoons/pe/allow-seq-length

Added a period parameter to the transformer

Merge pull request #25 from kryptonite0/fix_default_chunk_mode

fixed default chunk_mode

Fix wrong MHA block in decoder (#23)

Add information link for dataset in README

Forcing sphinx>3 for rtd build

Update training cause windows break stuff