How to train the Image Quality Sorter deeplearning model?

I am testing the usability of the deeplearning option of the Image Quality Sorter in digiKam. Despite my searches in the manual, this forum and other, I have not found any guidance on how you can educate the model in applying accepted/rejected labels to images. Can anyone share how this is done?

The deep learning model was pre-trained during development phase. It is not supposed to be tweaked by the end user. See this link about the DigiKam Image Quality Sorter Algorithms Improvement.