tvaranka

### Preflight Checklist * [x] I agree to follow the [Code of Conduct](https://github.com/jgraph/drawio/blob/master/CODE_OF_CONDUCT.md) that this project adheres to. * [x] I have searched the issue tracker for a feature request...

There seems to be an issue with data leakage here. In line 406 and 407 the best f1-score is updated inside the LOSO loop. Essentially, this is early stopping where...