[WIP] Fetch new validation data for each calc_loss #279
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This PR makes
calc_loss
use a new validation set each time it's called (one can now limit the amount of validation data used percalc_loss
call, so this makes sense). Since we're using relatively small validation sets for each calc_loss this should, in principle at least, make validation loss more informative when observed over multiple validation steps.I'd like to get some feedback from @noobpwnftw on this change before it's merged.
I'd also like to get some feedback on how to handle the case when we couldn't fetch the requested amount of the data for validation. This might happen in extreme cases. Currently I made it continue with a warning as the training can proceed even without validation data, but there might be a better resolution to this problem.