I installed the luarocks sys but it seems the filep function doesnt exist.
no trace of it in the code of sys on github and it's not mentioned in the doc.
When I run a program that use DataSetLabelMe it returns :
DataSetLabelMe.lua:59 attempt to call field filep(a nil value)
the line 59 is :
if sys.filep(paths.concat(self.path,path_images,folder)) then
best regards
ps: I'm on Ubuntu. it may change something, I saw on the sys doc that some functions don't exist on other OS