Popularity Baseline & Evaluation with MAE
This lesson is part of the course
In this lesson
You check on eight held-out ratings whether collaborative filtering really beats the simplest possible recommender: the book's average rating.
Buy the course once for $9.99 to unlock every lesson and lab, the final exam and the certificate – lifetime access, no subscription.
Lessons in this course
- The User–Item Ratings Matrix Locked
- Cosine Similarity Between Users Locked
- User-Based Collaborative Filtering Locked
- Item-Based Similarity: "Customers Who Bought X" Locked
- Popularity Baseline & Evaluation with MAE Locked
- Bag of Words: Counting Words with Formulas Locked
- TF-IDF: Which Words Really Matter Locked
- Sentiment Scoring with a Word Lexicon Locked