during_training_metric used as validation loss

[elcorto]

When using parameters.running.during_training_metric, the quantity (e.g. band energy) is used as validation loss, both in the text log and when fed to tensorboard, which is a bit confusing as it distorts loss plots.

The quantity should probably be reported in addition to the validation loss instead.

[RandomDefaultUser]

Hi @elcorto, @nerkulec overhauled the entire error reporting process extensively in his PR #560 . I think this should also address your issue, could you have a look?

[nerkulec]

#560 solves the issue