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

Creating DenseVector and setup with Spark 2.0


In this recipe, we explore DenseVectors using the Spark 2.0 library.

Spark provides two types of vector facilities (dense and sparse) for storing and manipulating feature vectors that are going to be used in learning or optimization algorithms.

How to do it...

  1. In this section, we examine DenseVector examples that you would most likely use for implementing/augmenting existing machine learning programs. These examples also help to better understand Spark ML or MLlib source code and the underlying implementation (for example, Single Value Decomposition).
  2. Here we look at creating an ML vector feature (with independent variables) from arrays, which is a common use case. In this case, we have three almost fully populated Scala arrays corresponding to customer and product feature sets. We convert these arrays to the corresponding DenseVectors in Scala:
val CustomerFeatures1: Array[Double] = Array(1,3,5,7,9,1,3,2,4,5,6,1,2,5,3,7,4,3,4,1)
 val CustomerFeatures2...