Collaborative Filtering

The video explains collaborative filtering, a method for recommending items based on user preferences. It distinguishes between user-based and item-based filtering, using a movie recommendation example. The video also discusses the importance of a rating matrix in predicting user preferences and concludes with a preview of the next video, which will delve deeper into the recommendation pipeline.

What is the main idea behind collaborative filtering?

Explain the difference between user-based filtering and item-based filtering.

How does collaborative filtering work in a real-life scenario?

What is the purpose of a rating matrix in collaborative filtering?

Describe how the system predicts ratings for movies that have not been rated.