# Recommender Systems: Under the Hood of Recommendation Systems

Math    |    Beginner
• 10 videos | 1h 23m 20s
• Includes Assessment
Rating 4.2 of 5 users (5)
Users marvel at a system's ability to recommend items they're likely to appreciate. As someone working with machine learning, implementing these recommendation systems (also called recommender systems) can dramatically increase user engagement and goodwill towards your products or brand. Use this course to comprehend the math behind recommendation systems and how to apply latent factor analysis to make recommendations to users. Examine the intuition behind recommender systems before investigating two of the main techniques used to build them: content-based filtering and collaborative filtering. Moving on, explore latent factor analysis by decomposing a ratings matrix into its latent factors using the gradient descent algorithm and implementing this technique to decompose a ratings matrix using the Python programming language. By the end of this course, you'll be able to build a recommendation system model that best suits your products and users.

## WHAT YOU WILL LEARN

• Discover the key concepts covered in this course
Summarize the use cases of recommendation systems and the different techniques applied to build such models, with emphasis on the content-based filtering approach
Describe the intuition behind collaborative filtering, its main advantages, and how ratings matrices, the nearest neighbor approach, and latent factor analysis are involved
Decompose a ratings matrix into its latent factors
Apply gradient descent to compute the factors of a ratings matrix
• Compute a penalty for a large number of latent factors when computing the factors of a ratings matrix
Use numpy and pandas to define a ratings matrix that can be fed into a recommendation system
Implement the gradient descent algorithm to decompose a ratings matrix
Compute the predicted ratings given by users for various items by using matrix decomposition
Summarize the key concepts covered in this course

## IN THIS COURSE

• 3.  The Collaborative Filtering Technique
• 4.  How to Work with Matrix Factorization
• 5.  Using Matrix Factorization with Gradient Descent
• 6.  Introducing a Regularization Term to Matrices
• 7.  Preparing the Ratings Matrix
• 8.  Decomposing a Ratings Matrix
• 9.  Estimating Ratings Using Gradient Descent
• 10.  Course Summary

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