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

Lasso regression with SGD optimization in Spark 2.0


In this recipe, we will use the housing dataset from the recipes to demonstrate shrinkage with Spark's RDD-based lasso regression LassoWithSGD(), which can select a subset of parameters by setting the other weights to zero (hence eliminating some parameters based on the threshold) while reducing the effect of others (regularization). We emphasize again that ridge regression reduces the parameter weight, but never sets it to zero.

LassoWithSGD(), which is Spark's RDD-based lasso (Least Absolute Shrinkage and Selection Operator) API, a regression method that performs both variable and regularization at the same time in order to eliminate non-contributing explanatory variables (that is, features), therefore enhancing the prediction's accuracy. Lasso, which is based on Ordinary Least Squares (OLS), can be easily to other methods, such as General Liner Methods (GLM).

How to do it...

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