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Course Description
This course will show you how to build recommendation engines using Alternating Least Squares in PySpark. Using the popular MovieLens dataset and the Million Songs dataset, this course will take you step by step through the intuition of the Alternating Least Squares algorithm as well as the code to train, test and implement ALS models on various types of customer data.
Prerequisites
Curriculum
Course outline
1
Recommendations Are Everywhere
This chapter will show you how powerful recommendations engines can be, and provide important distinctions between collaborative-filtering engines and content-based engines as well as the different types of implicit and explicit data that recommendation engines can use. You will also learn a very powerful way to uncover hidden features (latent features) that you may not even know exist in customer datasets.
- Why learn how to build recommendation engines?50 XP
- See the power of a recommendation engine100 XP
- Power of recommendation engines50 XP
- Recommendation engine types and data types50 XP
- Collaborative vs content-based filtering50 XP
- Collaborative vs content based filtering part II50 XP
- Implicit vs explicit data100 XP
- Ratings data types100 XP
- Uses for recommendation engines50 XP
- Alternate uses of recommendation engines.50 XP
- Confirm understanding of latent features100 XP
2
How does ALS work?
In this chapter you will review basic concepts of matrix multiplication and matrix factorization, and dive into how the Alternating Least Squares algorithm works and what arguments and hyperparameters it uses to return the best recommendations possible. You will also learn important techniques for properly preparing your data for ALS in Spark.
3
Recommending Movies
In this chapter you will be introduced to the MovieLens dataset. You will walk through how to assess it's use for ALS, build out a full cross-validated ALS model on it, and learn how to evaluate it's performance. This will be the foundation for all subsequent ALS models you build using Pyspark.
4
What if you don't have customer ratings?
In most real-life situations, you won't not have "perfect" customer data available to build an ALS model. This chapter will teach you how to use your customer behavior data to "infer" customer ratings and use those inferred ratings to build an ALS recommendation engine. Using the Million Songs Dataset as well as another version of the MovieLens dataset, this chapter will show you how to use the data available to you to build a recommendation engine using ALS and evaluate it's performance.
Building Recommendation Engines with PySpark
Course
Complete
