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Frank Kane's Taming Big Data with Apache Spark and Python

You're reading from   Frank Kane's Taming Big Data with Apache Spark and Python Real-world examples to help you analyze large datasets with Apache Spark

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Product type Paperback
Published in Jun 2017
Publisher Packt
ISBN-13 9781787287945
Length 296 pages
Edition 1st Edition
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Author (1):
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Frank Kane Frank Kane
Author Profile Icon Frank Kane
Frank Kane
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Table of Contents (8) Chapters Close

Preface 1. Getting Started with Spark 2. Spark Basics and Spark Examples FREE CHAPTER 3. Advanced Examples of Spark Programs 4. Running Spark on a Cluster 5. SparkSQL, DataFrames, and DataSets 6. Other Spark Technologies and Libraries 7. Where to Go From Here? – Learning More About Spark and Data Science

Creating similar movies from one million ratings – part 3


About 15 minutes after I set off our movie-similarities-1m script on a cluster using EMR, I have some actual results to look at. Let's review what happened.

Assessing the results

Here are the results:

The top similar movie to Star Wars Episode Four, was Star Wars Episode Five, not too surprising. But the next entry is a little bit surprising, some little movie called Sanjuro had a very high similarity score. Let's look at what's going on there. Its actual strength, the number of people that rated that together with Star Wars, was only 60, so I think it's safe to say that is kind of a spurious result. Now that we're using a million ratings, we probably need to increase that minimum threshold on the number of co-raters in order to actually display a result. By doing so, we could probably pretty easily filter out movies like that and instead get Raiders of the Lost Ark as our second result instead of as our third. I think the position...

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