It seems like the tests are failing with older scikit-learn versions.

Codecov Report

Merging #566 into develop will decrease coverage by 0.02%.
The diff coverage is 60%.

@@             Coverage Diff             @@
##           develop     #566      +/-   ##
===========================================
- Coverage    89.91%   89.88%   -0.03%     
===========================================
  Files           32       32              
  Lines         2915     2917       +2     
===========================================
+ Hits          2621     2622       +1     
- Misses         294      295       +1

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I honestly have no clue why the code crashed before. According to my analysis, this should not have happened. I made some changes to the if/else structure of the setup_exists fn, as I had the impression that this was not according to the way it should be. These should have had no influence on the code crashing or not. @mfeurer what do you think?