[#0] Fixes all style code violations

[lancelafontaine]

• [x] Fixes all style code violations

[codecov[bot]]

Codecov Report

Merging #374 into master will decrease coverage by 0.01%. The diff coverage is 75%.

@@            Coverage Diff             @@
##           master     #374      +/-   ##
==========================================
- Coverage    67.1%   67.08%   -0.02%     
==========================================
  Files          53       53              
  Lines        2128     2127       -1     
  Branches       16       16              
==========================================
- Hits         1428     1427       -1     
  Misses        698      698              
  Partials        2        2

Impacted Files	Coverage Δ
...extraction/pre_processing/pre_processing_driver.py	100% <ø> (ø)	:arrow_up:
...ice/model_training/regression/regression_driver.py	60% <ø> (ø)	:arrow_up:
...ture_extraction/post_processing/regex/regex_lib.py	100% <ø> (ø)	:arrow_up:
src/backend_service/services/task_service.py	50% <ø> (ø)	:arrow_up:
src/ml_service/model_training/training_driver.py	50% <ø> (ø)	:arrow_up:
...ice/model_training/classifier/classifier_driver.py	80% <ø> (ø)	:arrow_up:
...e_extraction/post_processing/regex/regex_tagger.py	96.09% <ø> (ø)	:arrow_up:
...regression/multi_output/multi_output_regression.py	53.12% <0%> (ø)	:arrow_up:
...ion/single_output_regression/abstract_regressor.py	60.6% <100%> (ø)	:arrow_up:
...n/single_output_regression/tenant_pays_landlord.py	34.37% <100%> (ø)	:arrow_up:
... and 5 more

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