Comment by TrackerFF

First hurdle is to simply get the (more often than not, Python) dependencies to work. I've worked on reproducing some relatively simple DL programs - written by academics I know - where I've literally spent days to weeks just to get all the dependencies right. And I've had direct contact with them - which may absolutely not be the case for other people.

I don't know why DL libraries are so afflicted by this, maybe things just move so fast. But it is such a pain in the ass.