Both the files can be directly run from cmd as these are .py files.

File: recommender_system_approach_1.py
Detail: Code for predicting ratings using sklearn regression packages.
Implementation of regression function can be found at line no.156

File recommender_system_approach_2.py
Detail: Code for predicting ratings by creating CSR matrix and KNN.
Implemenatation of this can be found on line no. 72 and 132