Fisher information using the test data?

Hi,

I noticed that the fisher information is calculated by the test data. See line 345 in `src_image_data/train_procedures.py`
```
fisher_info_val=previous_network.compute_fisher_information(X_test_converted,session)
```
But I think we should calculate it using the training data. Did I misunderstand something or is there any reason to use the test data? Thanks.

Best!