Book Image

Apache Spark 2.x Machine Learning Cookbook

By : Mohammed Guller, Siamak Amirghodsi, Shuen Mei, Meenakshi Rajendran, Broderick Hall
Book Image

Apache Spark 2.x Machine Learning Cookbook

By: Mohammed Guller, Siamak Amirghodsi, Shuen Mei, Meenakshi Rajendran, Broderick Hall

Overview of this book

Machine learning aims to extract knowledge from data, relying on fundamental concepts in computer science, statistics, probability, and optimization. Learning about algorithms enables a wide range of applications, from everyday tasks such as product recommendations and spam filtering to cutting edge applications such as self-driving cars and personalized medicine. You will gain hands-on experience of applying these principles using Apache Spark, a resilient cluster computing system well suited for large-scale machine learning tasks. This book begins with a quick overview of setting up the necessary IDEs to facilitate the execution of code examples that will be covered in various chapters. It also highlights some key issues developers face while working with machine learning algorithms on the Spark platform. We progress by uncovering the various Spark APIs and the implementation of ML algorithms with developing classification systems, recommendation engines, text analytics, clustering, and learning systems. Toward the final chapters, we’ll focus on building high-end applications and explain various unsupervised methodologies and challenges to tackle when implementing with big data ML systems.
Table of Contents (20 chapters)
Title Page
Credits
About the Authors
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface

Exploring the ratings data details for the recommendation system in Spark 2.0


In this recipe, we explore the data from the user/rating perspective to the nature and property of our data file. We will start to explore the ratings data file by parsing data into a Scala case class and generating visualization for insight. The ratings data will be used a little later to generate features for our recommendation engine. Again, we stress that the first step in any data science/machine learning exercise should be visualization and exploration of the data.

Once again, the best way of understanding data quickly is to generate a data visualization of it, and we will use a JFreeChart scatterplot to do this. A quick look at the chart of users by ratings produced by the JFreeChart plot shows a resemblance to a multinomial distribution with outliers, and an increasing sparsity when ratings are increased in magnitude.

How to do it...

  1. Start a new project in IntelliJ or in an IDE of your choice. Make sure the...