Dear expert,
my question is simple: the validation sample in pyKeras, used for computing the val_loss (val_accuracy) at each epoch (in order to save only the best model and/or for early stopping), is the test sample defined in the TMVA::dataloader? Or is it a subsample of the training sample?
I don’t understand if this sample is selected by TMVA or Keras and with which criteria.
Thank you,
Alberto