I can't explain the first 80% of it but the last bit: io/prediction/evaluations/itemsim/topkitems/ Is the folder structure required by the package definit

I can't explain the first 80% of it but the last bit: io/prediction/evaluations/itemsim/topkitems/ Is the folder structure required by the package definition. EDIT: mostly it seems to be the result of the project being constructed as dozens of separate modules each with it's own build process...yikes...