Enable python 3.9

[franchuterivera]

This PR enables python 3.9

[codecov]

Codecov Report

Merging #264 (1532868) into development (76bdde7) will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           development     #264   +/-   ##
============================================
  Coverage        81.66%   81.66%           
============================================
  Files              151      151           
  Lines             8646     8646           
  Branches          1328     1328           
============================================
  Hits              7061     7061           
- Misses            1108     1109    +1     
+ Partials           477      476    -1     

Impacted Files	Coverage Δ
.../setup/lr_scheduler/CosineAnnealingWarmRestarts.py	96.42% <ø> (ø)
...reprocessing/feature_preprocessing/TruncatedSVD.py	89.65% <0.00%> (-3.45%)	⬇️
autoPyTorch/ensemble/ensemble_builder.py	73.58% <0.00%> (+0.20%)	⬆️

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[ravinkohli]

Thanks for this PR. I think it can be merged

[nabenabe0928]

Thanks for the PR.
I put a small comment.

[nabenabe0928]

Why did you delete \ ?

The usage of the Inline math represetations is nicely described here.

where :math:`\eta_{\max}` is set to the initial lr, :math:`T_{\text{cur}}` is the number of epochs
since the last restart and :math:`T_{i}` is the number of epochs between two warm

[franchuterivera]

Hello, sorry this was not an intentional change.

My vim configuration changed this. It did so because this should be a raw string, as \e is not a valid escaped sequence.