test error ./modules/2d_slices_from_3d_sampling.ipynb

**Describe the bug**
```
18:37:54  Running ./modules/2d_slices_from_3d_sampling.ipynb
18:37:54  Checking PEP8 compliance...
18:37:55  Running notebook...
18:37:55  Error: Couldn't find the keyword "max_epochs", and the notebook wasn't on the list of expected exemptions ("doesnt_contain_max_epochs")..
```