@jean.senellart I was coming back to this again to see if in the updates the translation / epoch was included, but it doesn't seem so. Does that mean we will go with @vince62s script for unloading / reloading during training? It's a pity, since it seems trivial to just run through the validation data during the training.
If there is no plan to add this feature, then I will try to maintain my own script for this in case anyone else is interested. I should be getting back to this task in the next few days and will update my fork.