Can we use external data or external model?

Can we use external public dataset? Can we use external model on github, like lung segmentation, which has been trained by other people?

Yes, you can use publicly available models or models trained on publicly available data, as long as these are released under a permissive licence. Also see https://grand-challenge.org/forums/forum/stoic2021-602/topic/pretrained-models-288/.

Kind regards, Luuk