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

One-vs-Rest classifier (One-vs-All) in Apache Spark 2.0


In this recipe, we demonstrate One-vs-Rest in Apache Spark 2.0. What we are trying to achieve with the OneVsRest() classifier is to make a binary logistic regression to work for a multi-class / multi-label classification problem. The recipe is a two-step approach in which we first configure a LogisticRegression() object and then use it in a OneVsRest() classifier to solve a multi-class classification problem using logistic regression.

How to do it...

  1. Go to the LIBSVM Data: Classification (Multi-class) Repository and download the file: https://www.csie.ntu.edu.tw/~cjlin/libsvmtools/datasets/multiclass/iris.scale
  1. Start a new project in IntelliJ or in an IDE of your choice. Make sure the necessary JAR files are included.
  2. Set up the package location where the program will reside:
package spark.ml.cookbook.chapter5
  1. Import the necessary packages for the SparkSession to gain access to the cluster and Log4j.Logger to reduce the amount of output produced...