On Windows one might experience File Not Found errors for perfectly legitimate paths.

Errors thrown on windows if the file path to an image is > 260 characters, can be fixed by adding the prefix: "\\?\" to the file path (https://docs.microsoft.com/en-us/windows/desktop/fileio/naming-a-file#maximum-path-length-limitation)

However, there are many spots where long paths can happen, so the easiest fix is to work in a directory that by itself does not have too many characters...

See, e.g.
#175
This issue fixes the issues for the train/test images:
#195