Recommender Systems - Aggarwal
All these implementations are to help me learn the algorithms - they don't form any kind of library or tutorial. Just putting them in the public domain in case they're useful to anyone else also studying from this book.
Chapter 2: Neighborhood-Based Collaborative Filtering
This calculates the missing item 1 for user 3 from table 2.1 in the book. It can also be used to solve exercises 1 and 2 if you change the matrix and the item requested in main().