lol this sounds all too familiar, though I’ve just avoided using dataframes and their pesky :symbols till quite recently. Still not sure how to do matrix multiply on a vector of vectors, but i now know how to extract to a matrix (it’s hiding in the .columns field 
)
Kaggle was a quite harsh environment for julia packages though, every run was essentially a start-up run, so as less as possible - where possible, seemed to work… 0 wins isn’t all bad against XGboost and the like