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Apache Spark 2.x Cookbook

You're reading from   Apache Spark 2.x Cookbook Over 70 cloud-ready recipes for distributed Big Data processing and analytics

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Product type Paperback
Published in May 2017
Publisher
ISBN-13 9781787127265
Length 294 pages
Edition 1st Edition
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Author (1):
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Rishi Yadav Rishi Yadav
Author Profile Icon Rishi Yadav
Rishi Yadav
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Table of Contents (13) Chapters Close

Preface 1. Getting Started with Apache Spark FREE CHAPTER 2. Developing Applications with Spark 3. Spark SQL 4. Working with External Data Sources 5. Spark Streaming 6. Getting Started with Machine Learning 7. Supervised Learning with MLlib — Regression 8. Supervised Learning with MLlib — Classification 9. Unsupervised Learning 10. Recommendations Using Collaborative Filtering 11. Graph Processing Using GraphX and GraphFrames 12. Optimizations and Performance Tuning

Understanding feature engineering


When working on a data pipeline, there are two activities that take up most of the time: data cleaning/data preparation and feature extraction. We already covered data cleaning in the previous chapters. In this recipe, we are going to discuss different aspects of feature engineering. 

Feature selection

When it comes to feature selection, there are two primary aspects:

  • Quality of features
  • Number of features

Quality of features

Every feature is created different from others. Consider the house pricing problem again. Let's look at some of the features of a house:

  • House size
  • Lot size
  • Number of rooms
  • Number of bathrooms
  • Type of parking garage (carport versus covered)
  • School district
  • Number of dogs barking in the house
  • Number of birds chirping in backyard trees

The last two features may look ridiculous to you, and you might wonder what that has got to do with the house price, and you are right. At the same time, if these features are given to the machine learning algorithm,...

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