The User–Item Ratings Matrix
This lesson is part of the course
In this lesson
You read Bramble Books' ratings matrix like a recommender does: user and book averages, how empty the matrix is, and how many books two readers have in common.
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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