Just to demonstrate the workaround I described will attach an example from the UI on how it looks at the moment. Here I used 2 savers, with n_saved=2 , and filename_prefix=str(date.today()) + "_val_neg_img_loss" and filename_prefix=str(date.today()) , therefore there are 4 output models in total. If I wouldn't add "_val_neg_img_loss" to one prefix there would be only 2 models, even though (as you can see in the screenshot) in the model name the _val_neg_img_loss was used already because it is passed as score_name parameter