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

Isotonic regression in Apache Spark 2.0


In this recipe, we demonstrate the IsotonicRegression() function in Spark 2.0. The isotonic or monotonic regression is used when order is expected in the data and we want to fit an increasing ordered line (that is, manifest itself as a step function) to a series of observations. The terms isotonic regression (IR) and monotonic regression (MR) are synonymous in literature and can be used interchangeably.

In short, what we are trying to do with the IsotonicRegression() recipe is to provide a better fit versus some of the shortcomings of Naive Bayes and SVM. While they are both powerful classifiers, Naive Bayes lacks a good estimate of P (C | X) and Support Vector Machines (SVM) at best provides only a proxy (can use hyperplane distance), which is not an accurate estimator in some cases.

How to do it...

  1. Go to the website to download the file and save the file into the data path mentioned in the following code blocks. We use the famous Iris data and fit a...