fix the missing of import get_loaders

[geekinglcq]

Thanks for your good job and SpQR is really useful. I found two missing imports in main.py and main_for_rw.py and fixed them.

[poedator]

Thank you for the enthusiasm about SpQR! This import is addressed here by from datautils import *

This repo is under refactoring, a cleaner code is due in few days - come check it out then.