Pass only features to the `preprocess` function

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (1a3bb0c) 94.35% compared to head (bdd2fdd) 94.19%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #229 +/- ## ========================================== - Coverage 94.35% 94.19% -0.16% ========================================== Files 40 40 Lines 1239 1240 +1 ========================================== - Hits 1169 1168 -1 - Misses 70 72 +2 ```

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